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  • 1
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    Fire technology 19 (1983), S. 2-2 
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  • 2
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    Fire technology 19 (1983), S. 3-4 
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  • 3
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    Fire technology 19 (1983), S. 5-13 
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    Notes: Abstract This paper will describe the work done and results of the study to characterize various directional cooling spray nozzles when used with Aqueous Film Forming Foam (AFFF) Agents.
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  • 4
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    Fire technology 19 (1983), S. 14-21 
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    Notes: Abstract The response of a standard ionization detector to artificially generated test aerosols as well as to test fire and smoke has been determined experimentally. The size distribution and number concentration of these aerosols have been measured by independent methods.
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  • 5
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    Fire technology 19 (1983), S. 22-30 
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    Notes: Abstract The surface pitting of copper conductors recovered from fire debris has been reproduced by laboratory tests. The results of these tests demonstrate that molten aluminum that comes in contact with copper conductors drastically reduces the melting point of copper by alloying.
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    Fire technology 19 (1983), S. 31-56 
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    Notes: Abstract The controlling factors of the various phases of building fires, namely, ignition and initial fire spread, pre-flashover fire growth, fully developed fire, and intercompartmental fire spread, are examined together with the smoke problem that may be associated with any of them.
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  • 7
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    Fire technology 19 (1983), S. 57-60 
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  • 8
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    Fire technology 19 (1983), S. 65-66 
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  • 9
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    Fire technology 19 (1983), S. 61-64 
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  • 10
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    Fire technology 19 (1983), S. 67-70 
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  • 11
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    Fire technology 19 (1983), S. 74-74 
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  • 12
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    Fire technology 19 (1983), S. 75-76 
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  • 13
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    Fire technology 19 (1983), S. 77-89 
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    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The development of correlations between laboratory test methods and full-scale fire behavior does not only depend on the appropriateness of the laboratory test. Some results of data analysis and modeling will be presented for the wide-body post crash aircraft fire currently under study by the FAA.
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  • 14
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    Fire technology 19 (1983), S. 103-114 
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    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract A brief review is presented of methods for stochastic modeling of fires of sufficient severity to threaten the, structural safety of buildings. Information is provided on the rate of fire occurrences according to the floor area at risk for the major occupancy types.
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  • 15
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    Fire technology 19 (1983), S. 90-102 
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    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Fatality or injury due to fire is an aspect of the working of an entire system. That is, casualty due to fire represents a failure of a system and ultimately, this includes the social system within which we live. As part of such a consideration, many different techniques and models may be used, and one such technique is that of logic-tree analysis.
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  • 16
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    Fire technology 19 (1983), S. 115-124 
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    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract This analysis shows the great importance of smoke barriers in isolating a fire in a large structure. The author is attempting to estimate mathematically fire growth and fire gas spread rate in the Beverly Hills Supper Club fire.
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  • 17
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    Fire technology 19 (1983), S. 136-139 
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  • 18
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    Fire technology 19 (1983), S. 140-140 
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  • 19
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    Fire technology 19 (1983), S. 141-142 
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    Fire technology 19 (1983), S. 125-135 
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    Notes: Abstract The effectiveness of a range of thermal barriers for preventing the involvement of plastic foam insulation in the propagation of fires in wall cavities was investigated. Tests carried out in a small furnace showed that, with a barrier of 15.9 mm fire-resistant gypsum board, the time required for a 140° temperature rise at the insulation-barrier interface was at least 22 minutes.
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  • 21
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    Fire technology 19 (1983), S. 146-146 
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  • 22
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    Fire technology 19 (1983), S. 147-148 
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    Fire technology 19 (1983), S. 149-162 
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    Notes: Abstract Following the release of a flammable liquid, a variety of different fire situations may develop, the most hazardous of which is the growing pool fire. Supporting experiments demonstrate basic concepts in pool growth similarity suggested by the present theory.
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  • 24
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    Fire technology 19 (1983), S. 163-169 
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    Notes: Abstract The objective of this study was to examine four hypotheses concerned with the relative safety of garments available through regular retail outlets and safety specialty stores. Of interest to the study are the garments' safety, durability, comfort, and cost.
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    Fire technology 19 (1983), S. 170-184 
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    Notes: Abstract A simple tool for monitoring adequacy of fire service delivery is presented in this paper as an example of how planners, departments of municipal service, community boards, and unions can monitor service delivery.
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  • 26
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    Fire technology 19 (1983), S. 185-191 
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    Notes: Abstract Most short circuits are the results of a fire rather than its cause. However, the systematic mapping of the locations of short circuits, at the site of a fire, can help trace the point of origin of the fire.
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    Fire technology 19 (1983), S. 192-203 
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    Notes: Abstract A test program, jointly sponsored by the Society of the Plastics Industry of Canada and the National Research Council, examined the contribution of plastic foams to fire spread in buildings. The conditions under which these materials may be safely used in buildings of noncombustible construction are defined.
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    Fire technology 19 (1983), S. 238-250 
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    Notes: Abstract Full-scale room fire economics necessitate a screening test procedure requiring only a small amount of material to quantitatively assess heat release rate. This test could determine which materials may justify full-scale testing and those which fail early. Such a procedure is described, sample results are given, and it is suggested that correlation of screening test results with full-room and bench-scale test methods could improve the evaluation of the pre-flashover fire spread characteristics of materials.
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  • 29
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    Fire technology 19 (1983), S. 269-272 
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  • 30
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    Fire technology 19 (1983), S. 262-268 
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    Notes: Abstract Typical methods for the evaluation of a hinge pin used in a clapper support of a check valve are presented. For clarity, an example is provided to show the application of the equations.
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  • 31
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    Fire technology 19 (1983), S. 273-274 
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  • 32
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    Fire technology 19 (1983), S. 275-279 
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    Fire technology 19 (1983), S. 280-286 
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    Notes: Abstract As part of the Cooperative Agreement on Housing and Other Construction, signed by the United States and the Union of Soviet Socialist Republics in 1974, reciprocal visits are made by United States and Soviet teams concerned with building firesafety and related problems. A highlight of these visitations is a symposium on a relevant fire problem at which each side updates the other. The National Bureau of Standards, the lead agency for the United States team, is headed by R. S. Levine, Chief of the NBS Fire Resources Division. During the symposium in July, 1982, the following paper was presented by the Soviet team.
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    Fire technology 19 (1983), S. 204-206 
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    Fire technology 19 (1983), S. 207-207 
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    Fire technology 19 (1983), S. 208-209 
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    Fire technology 19 (1983), S. 210-214 
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    Fire technology 19 (1983), S. 219-220 
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    Fire technology 19 (1983), S. 218-218 
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    Fire technology 19 (1983), S. 233-237 
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    Notes: Abstract In this paper, regression model analysis of data shows that United States cities have more fires and more fire fighters per capita but fewer fire fighters per fire than do foreign cities.
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    Fire technology 19 (1983), S. 221-232 
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    Notes: Abstract A series of full-scale fire tests involving sprinkler installations was conducted in 1979 and 1980 in a two-story residence in Los Angeles, CA, and in a mobile home in Charlotte, NC. Previous laboratory tests, including full-scale room fire tests, had indicated that a prototype “quick-response” sprinkler was effective in controlling residential home fires. More full-scale fire tests under less controlled and more operational conditions were considered necessary to confirm or deny these scientific and engineering judgments. The prime objective of the program was to test the performance of alternative sprinkler designs to “control” the development of fire in single-family dwellings and mobile homes.
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    Fire technology 19 (1983), S. 251-261 
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    Notes: Abstract Data for estimating the burning rate and heat output of large pool fires (diameter ≳ 0.2 m) are compiled and computational equations presented. Since a large scatter in the reported data is noted, attention is also focused on areas where further research is most needed in order to improve predictability.
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    Journal of chemical crystallography 13 (1983), S. 221-229 
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    Topics: Geosciences , Physics
    Notes: Abstract C18H10S2,M=290.34, monoclinic,P21,a=20.556(5),b=15.843(3),c=3.963(1) Å,β=92.79(2)° at 18°C,Z=4,D x =1.496 g cm−3,μ(Cu Kα)=3.53 mm−1. Full-matrix least-squares refinement resulted in a final conventionalR value of 0.036 for 2030 observed reflections. The average C-S bond distance is 1.747(16) Å, the S-S bond length is 2.074(1) Å. The torsion angles at the disulfide group are close to zero, at 3.5 and 0.8°. The carbon frameworks are nearly planar, and closely approximate symmetrymmm. Bond distances are comparable with those in related molecules.
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    Journal of chemical crystallography 13 (1983), S. 231-239 
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    Topics: Geosciences , Physics
    Notes: Abstract The results of an X-ray structure determination of one of the three possible chloride salts of [Cr(en) F2(OH2)2]+ show the two fluoro ligands to betrans to each other. The purple crystals are monoclinic in the space groupC2/c-C 2h 6 , witha=11.409(3),b=9.319(2),c=10.260(3) Å,β=128.73(2)° andD c =1.73 g cm−3 forZ=4. Least-squares refinement based on 1341 independent observed reflections resulted in a finalR of 0.026. The molecule lies on a crystallographic two-fold axis, and the Cr-F, Cr-N, and Cr-O bond lengths are 1.885(1), 2.044(2), and 1.997(2) Å respectively. It is suggested that the ill-defined shoulder in the visible electronic spectrum of this complex is indicative of atrans dihalo geometry.
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    Journal of chemical crystallography 13 (1983), S. 263-272 
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    Notes: Abstract The X-ray crystal structure of 3-ammonium-4-hydroxyphenylarsonic acid chloride dihydrate has been determined from single-crystal diffraction data. The compound crystallizes in the orthorhombic space groupPna 21 with four molecules in a unit cell of dimensionsa=17.712(7),b=13.468(4), andc=4.798(2) Å. The structure was solved by the Patterson method and refined to a finalR value of 2.1%. The average C-C phenyl distance is 1.393 Å, but two bonds are somewhat shorter than the others. This, coupled with the fact that the C-O and C-As bonds are shorter than normal, makes it appear as if there is a minor resonance contributor of a keto form. The C-N bond length of 1.443 Å is intermediate between values found in aminophenols and other ammoniumphenols. The H2AsO3 group is nearly tetrahedral, with the double-bonded oxygen rotated 9° out of the phenyl plane about the C-As bond. There is an extensive hydrogen-bonding system, involving every one of the OH and NH hydrogens, through the chloride and the waters of crystallization.
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    Journal of chemical crystallography 13 (1983), S. 279-292 
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    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of white (MNA-1) and yellow (MNA-3) forms of 4-methyl-2-nitroacetanilide have been determined by X-ray diffraction techniques. The crystals of MNA-1 are monoclinic,a=10.421(2),b=9.980(2),c=9.568(2) Å,β=99.51(2)°, space groupP21/c,Z=4. Crystals of MNA-3 are triclinic,a=17.956(2),b=12.908(2),c=4.039(1) Å,α=93.13(2)°,β=83.71(2)°, γ=90.77(2)°, space groupP¯1,Z=4. Both structures were solved by direct methods using theShelx-76 system of programs, and refined using full-matrix least squares. The number of unique reflections used in refinement and the finalR values are: MNA-1, 1545, 0.067; MNA-3, 3127, 0.065. The two distinct molecules in MNA-3 have intramolecular hydrogen bonds and different molecular conformations, although both are fairly planar, and each type is closely packed in columns of parallel molecules along thec direction. In MNA-1 the C=O⋯H-N geometry is indicative of intermolecular hydrogen bonding and the molecules adopt a conformation in which the nitro and amide groups lie in planes at approximately 45° to the benzene ring.
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    Journal of chemical crystallography 13 (1983), S. 303-310 
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    Notes: Abstract The title compound has been synthesized and its structure at room temperature has been solved. It crystallizes in the space groupP21/c, witha=9.581(5),b=13.746(4),c=8.869(1) Å, β=101.000(5)°, andZ=2. The structure was refined toR=0.029 from 1738 reflections. It consists of centrosymmetric dimeric units with two asymmetric end-to-end azido bridges. Each copper(II) ion is fivefold coordinated in the form of a slightly distorted square-based pyramid CuN5. The apical position is occuped by a nitrogen atom of the azido bridge with a Cu-N apical bond of 2.456(6) Å. The Cu-N bond with the azido bridge in the basal plane is 1.979(5) Å. The intradimer Cu⋯Cu distance is 5.004(2) Å. The magnetic properties and the X-band EPR spectrum are interpreted in the light of these structural data.
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    Journal of chemical crystallography 13 (1983), S. 333-353 
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    Topics: Geosciences , Physics
    Notes: Abstract The X-ray crystal structure of a racemic mixture of D- and L-penicillamine has been determined. Crystals are monoclinic,P21/c (No. 14), with cell dimensionsa=11.624(3),b=5.919(1),c=11.482(2) Å,β=114.48(2)°, andZ=2, based on the racemate. The structure was determined by standard methods and refined toR 1=0.0666,R 2=0.0726 for 985 independent reflections. Bond lengths and bond angles do not differ from those in similar structures. Mass spectra and1H and13C NMR spectra are reported ford-penicillamine, and detailed infrared and Raman spectra are reported for solidd-penicillamine hydrochloride,d 5-d-penicillamine hydrochloride,d-penicillamine,d 4-d-penicillamine, anddl-penicillamine. The Raman spectrum ofd-penicillamine in H2O solution as a function of pH is also reported.
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    Journal of chemical crystallography 13 (1983), S. 1-7 
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    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of SnBr[N(SiMe3)2]3 has been determined from three-dimensional X-ray diffraction data collected by counter methods. This compound crystallizes in the rhombohedral space groupR3c witha=11.970(3) Å, α=99.06(3)°, andZ=2forD c〉 =1.37 g cm−3. The finalR value was 0.027 based on 608 independent observed reflections. The molecule lies on a crystallographic three-fold axis which contains the Sn and Br atoms. The bromine atom is covalently coordinated to the tin atom at a Sn-Br separation of 2.519(2) Å. The three nitrogen atoms complete the bonding to tin with an Sn-N bond length of 2.056(7) Å.
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    Journal of chemical crystallography 13 (1983), S. 19-29 
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    Notes: Abstract C26H38O4,Mr=414.6, is monoclinic,P21/c, witha=15.059(2),b=7.348(2),c=23.164(3) Å,β=90.35(16)°,V c =2563.13(85) Å3,D x =1.07(4) g cm−3,μ(CuKα)=5.28 cm−1. The structure was determined by direct methods and refined by full-matrix least squares toR=0.074 for 2479 observed reflections. The two cyclohexane rings both adopt a chair conformation.
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    Journal of chemical crystallography 13 (1983), S. 31-41 
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    Notes: Abstract 13α-Hydroxy-α-isolupanine (I) and 13β-hydroxy-α-isolupanine (II) crystallize in the space groupP212121 witha=13.123(2),b=13.221(3),c=8.224(1) Å,Z=4 anda=9.745(2),b=11.383(1),c=12.710(2) Å,Z=4, respectively. Structural differences between the epimeric molecules are concentrated around ringA. In (I) ringA has a half-chair conformation, and in (II) it is a distorted sofa. TheA/B ring junction configuration isquasi-trans in the case of (I) andquasi-cis in (II). The above differences can be explained by the different intermolecular interactions observed in these two structures.
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    Journal of chemical crystallography 13 (1983), S. 61-70 
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    Journal of chemical crystallography 13 (1983), S. 71-72 
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    Journal of chemical crystallography 13 (1983), S. 89-97 
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    Notes: Abstract Crystals of 1-o-nitrophenyl-3-methyl-5-tert-butylpyrazole, C14H17N3O2, are orthorhombic:a=12.0924(6),b=11.3601(7),c=10.2317(4) Å,Z=4, space groupP212221. The crystal and molecular structures have been determined from X-ray diffractometer data by direct methods, and refined by least-squares to a finalR index of 0.034 for 1043 observed reflections. The title compound shows the substituents in the hypothesized positions. Bond distances and angles have reasonable values. The phenyl ring makes an angle of 74.6° with the pyrazole ring and the nitro group is rotated 23.8° with respect to the phenyl ring. The methyl ring in the 3-position exhibits disorder between two possible tetrahedra. Close molecular packing is given by layers of molecules approximately parallel to the (101) plane.
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    Notes: Abstract Infrared spectra of potassium azidopentacyanocobaltate(III) dihydrate (PACDH) were obtained from the polycrystalline substance, both normal and deuterated, and from the monocrystal using in this case a polarization analyzer. Raman spectra of the normal powder were also obtained. The observed bands were assigned either to the internal vibrational modes of the azidopentacyanocobaltate(III) ion (AC) or to the internal and librational modes of the hydration water.
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    Notes: Abstract The title compound is C16H20O5, MW=292.3, orthorhombic,P212121,a=9.741(2),b=29.391(7),c=5.354(1) Å from diffractometer measurements,V=1532.8 Å3,Z=4,D c =1.267 g cm−3,D o =1.271 g cm−3 (ether/1,1,2,2-tetrabromoethane), λ(Mo Kα)=0.71069 Å,F(000)=624,μ=1.02 cm−1, crystal dimensions 0.23×0.23×0.40 mm,R=0.049 for 1164 observed reflections. The molecule contains a possibly significant asymmetric ether linkage between the oxacyclohexane ring and the highly anisotropic benzyl ring. The packing consists of zigzagged chains parallel to thea-axis formed by hydrogen bonds. The chains are separated by van der Waals contacts.
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    Notes: Abstract Δ1(6)-Dehydro-17-oxosparteinium perchlorate, [C15H23N2O]+·C10 4 − , is monoclinic:P21,a=8.620(1),b=14.406(2),c=6.825(1) Å, β=101.97(1)°,Z=2,V c=829.1(1)Å3,D x=1.52g cm−3, μ (Cukα)=21.7cm−1. The finalR was 0.051 for 1159 observed counterreflections. Carbon atoms C(3) and C(4) are highly disordered. This is probably due to conformational properties of the ringA, which are caused by the group situated between ringsA andB. RingsB,C, andD have sofa, sofa, and chair conformations, respectively. The bond distances and valency angles of the quinolizidone moiety (ringsC andD) are in good agreement with those obtained previously for 17-oxosparteine (free base) and its perchlorate salt. The title compound was obtained from Δ5-dehydro-17-oxosparteine, the product of mercuric acetate dehydrogenation of 17-oxosparteine. From IR spectra in the condensed phase and13C-NMR measurements in DMSO-2H6 solution, it is evident that, in the crystalline state as well as in solution, the immoniumlactam molecular structure is present in the compound studied.
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    Journal of chemical crystallography 13 (1983), S. 179-189 
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    Notes: Abstract The crystal structures of the two carboxylic amides C13H10N2O3 (I) and C14H13NO2 (II) have been determined by direct methods and refined by full-matrix least squares. The predominant structural feature is the hydrogen bonding (N-H⋯O=C) which influences the conformations of both structures.
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    Journal of chemical crystallography 13 (1983), S. 77-87 
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    Notes: Abstract The coefficient σ1 describing the linear dependence of proton magnetic shielding on density has been measured for the gases CH4, C2H6, C2H4, CH3F, CH2F2, CHF3, and H2S at 20° C for some other temperatures. Measurements were made at 220 MHz. Corrections for bulk susceptibility give fairly good agreement with earlier values but make clear that existing susceptibility data are inadequate for making these corrections precisely. A temperature variation of σ1 is detectable for all the gases except methane.
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    Journal of chemical crystallography 13 (1983), S. 99-105 
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    Notes: Abstract Crystals of 9-methyladenine salicylate (C6H8N 5 + ·C7H5O 3 − ), mp 126°C, are orthorhombic, space groupPbcn (D 2h 14 , No. 60) witha=25.305(3),b=8.066(1),c=12.928(2) Å,d c=1.446 g cm−3,d m=1.43 g cm−3 (CCl4/ cyclohexane) forZ=8. The 9-methyladenine, protonated at N(1), and salicylate form a pair of strong hydrogen bonds with N⋯O distances of 2.617 and 2.858 Å. In addition, a hydrogen bond is formed between two adenine moieties using the amino group and imidazole nitrogen, N(7), with N⋯N separation of 3.114 Å. As in salicylic acid, an intermolecular hydrogen bond of 2.560 Å is formed between the hydroxyl and a carboxyl oxygen atoms.
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    Notes: Abstract 13C-enriched carbido carbonyl clusters of the type [M6C(CO) n ] z− (M=Fe,n=16,z=2; M=Ru,n=16 ifz=2 andn=17 ifz=0) have been prepared and their IR spectra observed in the 900−600 cm−1 region; the band shifts occurring upon13 C substitution enable the assignment to the stretching modes of the interstitial C atom. Band patterns reflect the symmetry of the M6C core, but the frequencies seem dependent on other molecular features.
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    Journal of chemical crystallography 13 (1983), S. 135-141 
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    Notes: Abstract A mathematical description for the symmetry coordinates of the vibrational fundamentals of five-membered ring systems is presented. A force-constant calculation was performed for 1,3-dioxol-2-one and compared with results assuming an ideal pentagon. Though the deviation of the ring fromD 5h , symmetry is rather small, some force constants already show differences in the first digit.
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    Journal of chemical crystallography 13 (1983), S. 173-173 
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    Journal of chemical crystallography 13 (1983), S. 165-172 
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    Notes: Abstract The title compound, C15H22N2O2, is monoclinic:P21,a=10.876(2),b=8.620(2),c=7.390(2) Å, β=99.2(2)°,Z=2. TheA/B ring junction configuration isquasi-trans, and theC/D junction istrans. RingA has a conformation intermediate between sofa and half-chair; ringsB,C, andD are in chair, boat, and distorted chair conformations, respectively.
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    Journal of chemical crystallography 13 (1983), S. 201-210 
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    Notes: Abstract From the1H,13C, and119Sn NMR spectra at different temperatures, it is concluded that the 5-alkyl-5-aza-2,8-dioxa-1-stanna(II)bicyclo[3.3.0]octanes dimerize in nonpolar solvents. The barrier for dimerization is lower (ΔG
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    Journal of chemical crystallography 13 (1983), S. 211-220 
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    Notes: Abstract 1,8-bis(dimethylamino)naphthalene hydrobromide dihydrate, C14H19N 2 + Br · 2H2O, crystallizes in the space groupPnma witha=7.264(1),b=11.794(1),c=18.986 (2) Å,Z=4,D m =1.34 g cm−3,D X =1350 kg cm−3. The structure was determined by Patterson and Fourier methods and refined to anR factor of 0.038. The 1,8-bis(dimethylamino)naphthalene cation has mirror symmetry, with the mirror plane passing along the C(9)-C(10) bond. The two N atoms are moved slightly out of the naphthalene plane. Theperi interactions are discussed in relation to aromaticity and to the N-C (ring) bond lengths. The structure contains channels of H bonds (Br− and water molecules) parallel toa which alternate with channels of cations in theb andc directions. One of the water molecules is disordered.
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    Journal of chemical crystallography 13 (1983), S. 445-445 
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    Notes: Abstract Measurements of the Doppler effect of the annihilation γ-line and of the positron lifetime were carried out in three series of solid coordination complexes; the Mössbauer spectra of the iron-containing samples were also recorded. The lack of correlation between the Móssbauer and positron annihilation parameters suggests that electrons of the ligands rather than those of the central atoms dominate in positron annihilation processes.
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    Transportation 11 (1983), S. 321-322 
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    Transportation 11 (1983), S. 383-385 
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    Notes: Abstract The trend toward public ownership, public regulation, and public subsidization of the U.S. transit industry has recently come under attack. Many argue that the result has been reduced productivity, increased costs, and very little real benefit. This article examines the impacts of subsidies and public ownership in four large transit systems that cover a range of transit system types and financing arrangements. Evidence from the case studies is compared to the results of both time-series and cross-section regression analysis of operating and financial statistics for large samples of bus systems. Although the case studies and the regressions rely on different datasets and different techniques, they support the same conclusions. Increased subsidies and public ownership have kept down fares and permitted service expansion, but have also encouraged wasteful cost escalation. Thus, transit riders unquestionably have benefited from public takeovers of transit systems and burgeoning subsidies, but not nearly as much as they would have benefited if costs had not skyrocketed at the same time.
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    Transportation 11 (1983), S. 347-360 
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    Notes: Abstract Estimation of ridership on a new transit system in an area where no comparable service existed before is a difficult task of transit planning. Traditional modal split models cannot be used in these cases, because no data or basis for developing a new model or adjusting a “borrowed” model are available. One of the techniques which can be used in this type of situation, is to perform a “concept test” based on public opinion. This approach, however, is plagued with the phenomenon of non-commitment bias of interviewees, and tends to overestimate the ridership. A new fixed route and fixed schedule transit service in Johnson City in Tennessee provided a rare opportunity to perform an investigation on the non-commitment bias through “before” and “after” surveys. The analysis of the non-commitment and actual responses of a sample of residents revealed substantial bias. Overall, the non-commitment ridership estimate was about twice (100% greater than) the actual ridership.:It was also observed that the bias was higher for persons owning automobiles, and for work and shopping trips.
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    Transportation 11 (1983), S. 386-386 
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    Transportation 11 (1983), S. 361-382 
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    Notes: Abstract A brief transit strike in early December 1976 disrupted bus services to the city of Pittsburgh and surrounding Allegheny County. That strike provided an opportunity for testing a variety of approaches to increase ride-sharing and to reduce traffic congestion, and for examining the effect of the strike on traffic congestion and on individual travel behavior. Even though over 60% of the commuters to the CBD use transit, the effects of the strike were relatively mild. There was some increase in traffic flow into the CBD and some spreading of the peak period. The largest proportion of the transit commuters who made trips to the CBD during the strike were dropped off by a non-commuter, increasing highway traffic. The most severe impact was felt by those transit commuters who had no cars in the household; 25% of these commuters (only 3% of the total CBD commuters) stayed home from work on the first day of the strike. Most attempts to mitigate the impact of the strike had little effect, largely because most commuters were able to manage adequately during the short strike. The anticipated parking problem, on which much of the contingency planning was focused, did not emerge, largely because of the use of carpooling and “drop-off” mode by many of the transit users.
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    Transportation 11 (1983), S. 391-394 
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    Transportation 11 (1983), S. 387-390 
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    Transportation 11 (1983), S. 397-397 
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    Transportation 12 (1983), S. 1-2 
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    Transportation 12 (1983), S. 3-20 
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    Notes: Abstract In Canada, transportation regulation has evolved in response to the country's unique economic and demographic conditions—a land mass larger than that of the U.S.A. with one-tenth the population, as well as the social and political demands of nation building. Over the last 25 years, the general direction of transport policy has been toward less regulation in response to clear indications that actual and potential competition has been increasing, and as a result of the maturing of the industry. In contrast, where regulation can serve to prevent disruption of services or the abuse of monopoly power, it has been maintained. This paper outlines the trends in transport policy both before and after the passage of the National Transportation Act of 1967, which embodies the above principle. Regulatory practices and issues are examined on a modal basis, and future directions for transport policy are commented upon.
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    Transportation 12 (1983), S. 61-77 
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    Notes: Abstract Experiments are described with an activity-based travel model, estimated on a 7-day activity-diary survey. The first part of the paper describes the model system in its final form, together with its validation. The second part of the paper discusses some scenarios evaluated for the specific group of working men. Results are given with respect to a free Friday afternoon, extension of variable working hours, and income reduction.
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    Transportation 12 (1983), S. 21-43 
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    Notes: Abstract Although much has been written about the economics of transit tax financing, public views and opinions toward alternative tax sources have received comparatively short shrift. This paper examines the attitudes of transit managers as well as other political groups toward various tax sources available for financing transit services in the U.S.A. From a survey of 129 transit officials, state fuel and vehicle registration taxes are found to be the overwhelming favorites. Administrators for large transit properties generally also favor federal income tax financing of transit, while those for smaller agencies seem to rate sales tax revenues relatively highly. Several other studies have likewise shown sales taxes to be preferred by transit officials. With the planned phase-out of federal operating assistance, it is becoming increasingly imperative that authorizing legislation be enacted allowing jurisdictions to dedicate a range of local revenue sources to transit. While perspectives on transit tax financing were found to vary somewhat among vested interests, in general there seems to be more agreement than dissension on which tax sources should be used.
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    Transportation 12 (1983), S. 45-59 
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    Notes: Abstract The reasons underlying the decline of stage bus services in the U.K. over the past 30 years seem to be well understood, and the probable future trends have been projected using a quantitative forecasting model. The model considers U.K. bus services at a very aggregate level, but it breaks the demand into specific user groups: work trips, children's travel, travel by the elderly, and all other travel, and separately for households with and without a private car. Forecasts depend very sensitively on the level of economic growth assumed, since this governs the two major factors which determine public transport use — car ownership and the cost of operating the services. If the economy could recover its historic growth rates, a further substantial decline in bus use seems inevitable under most realistic assumptions. However, with the present economic outlook, a lower growth rate seems likely to persist for some time, and in this case public transport use will become much more stable in the 1990's; a tendency which would be helped if there were large increases in fuel prices. Many of the Metropolitan Counties have adopted policies of strongly restraining future rises in fares, in some cases to the extent of freezing fares in monetary terms. The effects of such policies on both patronage and subsidies are considered here, and although much of the current political attention is focussed on controlling fares, the question of balance between fares and service levels is also discussed. Lastly, it must be admitted that these predictions are based on knowledge which is largely restricted to the short-term effects of transport policies. The nature of our uncertainty about longer-term effects, and the possible size of them, is considered in terms of sensitivity-testing of the prediction model.
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    Transportation 12 (1983), S. 91-95 
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    Transportation 12 (1983), S. 79-90 
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    Notes: Abstract In spite of the recent progress made in household activity analysis and travel budget studies, urban transportation modeling still remains a “not-too-well developed” research field. There are conflicting theories, analysis units are not uniform, terms are not precisely defined, basic studies of sub-systems involved are not yet completed, and many models lack behavioral background as well as basic attributes such as simplicity, sensitivity, compatibility, transferability and forecasting ability. Gaps in methodology may be partially responsible for this situation. There is an urgent need for simple, yet not primitive, easily applicable urban transportation models which can respond to the technical needs of planners and engineers. Lessons from the past, as well as experiences from other disciplines, suggest that future research should concentrate on: (1) new, “unconventional” approaches based on systematic, basic studies of all sub-systems involved; (2) proper definition and stratification of an analysis unit; (3) revision and unification of definitions, classifications, etc., in order to improve the behavioral background of the models; (4) dynamic rather than static approaches, able to describe feedbacks between transportation and land-use as well as between transportation demand and supply; (5) interrelations between subsequent sub-models, particularly between car availability, trip generation and modal split; (6) developing models which are not only sensitive to transportation policies but also to other local policies (e.g. land use, city development, social, etc.).
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    Notes: Abstract Ab initio gradient calculations of the geometries of 1,3-dioxol-2-one, -thione, -onium, and the analogous 1,3-dithioles are reported. Together with force constants derived from GVFF calculations, these results give evidence of the changes in structure when substituting oxygen by sulfur. The electronic structure as well as the vibrational behavior are mainly determined by the electronic delocalization of the heteroatoms.
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    Journal of chemical crystallography 13 (1983), S. 43-48 
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    Notes: Abstract The 1∶1 crystal complex of salicylic acid (C7H6O3) and urea (CH4N2O), mp 121° C, is monoclinic, with space groupC2/c (C 2 6 h, No. 15) and unit cell dimensionsa=22.206(3),b=5.108(1),c=17.177(2) Å,β=106.18(1)°.d calc=1.407 g cm−3,d meas=1.41 g cm−3 forZ=8. The structure was determined by direct methods and refined by a full-matrix least-squares procedure to giveR=0.057 andR w =0.050 for 1652 integrated intensities above 2σ(I). The structure contains a strong OH⋯O hydrogen bond with O⋯O distance 2.54 Å in which the carboxyl OH group is donor and urea oxygen atom is acceptor. There are two NH⋯O intermolecular hydrogen bonds with N⋯O distances of 2.90 and 2.96 Å. Additionally, the salicyclic acid contains an intramolecular OH⋯O hydrogen bond of 2.56 Å.
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    Notes: Abstract Crystals of [NOMo(S2CNET2)2diars]+BF 4 − are monoclinic, space groupI2/a with eight molecules in a unit cell of dimensionsa=25.808(5),b=11.017(2),c=23.275(5) Å, andβ=108.10(2)°. The structure was solved by the heavy-atom method and refined by full-matrix least-squares calculations with anisotropic thermal parameters.R=0.048 for 2038 reflections withI〉3σ(I). The crystal structure contains discrete ions separated by normal van der Waals distances. The Mo atom has a distorted pentagonal bipyramidal geometry with the NO group and one S atom axial. Principal dimensions are: Mo-As 2.634(2) and 2.626(2); Mo-S(eq) 2.535(4), 2.530(4), and 2.503(3); Mo-S(ax) 2.552(4); Mo-N 1.78(1); N-O 1.19(1) Å; and Mo-N-O 175.9(9)°.
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  • 88
    ISSN: 1572-8854
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    Notes: Abstract The crystal structure of noxiptyline hydrochloride C19H23N 2 + OCl− (5-dimethylaminoethyloximino-5H-dibenzo[a,d]cyclohepta-1,4-diene hydrochloride), is monoclinic:P21/c, a=15.894(5),b=9.116(2),c=13.755(4) Å,β=113.00(7)°,Z=4. It has been determined by application of a multisolution direct method procedure, and refined by full-matrix least squares to a conventionalR of 0.056 for 1674 counterreflections (to 2Θ=44°, MoKα radiation). The noxiptyline molecule adopts a folded boat conformation with dihedral angle between benzo-group planes of 129.3°, and the atypical dimethylaminoethyloximino side chain adopts agauche-gauche distribution about the O-Cβ and Cα-Cβ bonds. The only intermolecular approach less than van der Waals distances is the hydrogen bond between the amine nitrogen atom and the chloride ion.
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  • 89
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    Journal of chemical crystallography 13 (1983), S. 245-251 
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    Notes: Abstract Crystals of C4H10NO2Cl, M r =139.58 are monoclinic,P21/c, witha=7.061(2),b=7.194(2),c=13.932(3) Å,β=98.88(2)°,V=699.2(5) Å3,Z=4,D x=1.326(1) g cm−3. The structure was solved by hand application of direct methods and refined to a goodness of fit of 1.7 for 1212 reflections and 114 parameters (R=0.028 for 1202 reflections withF 2〉0).
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  • 90
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    Journal of chemical crystallography 13 (1983), S. 253-262 
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    Notes: Abstract The optical absorption spectrum of Ni2+ doped in NH4Br single crystals has been studied at room and liquid-air temperatures. The observed ambient bands at 6300, 11,600, 13,400, 18,500, and 20,000 cm−1 have been assigned, respectively, to the transitions3 A 2(F) →3 T 2(F),3 T 1(F),1 E(D),1 T 2(D and3 T 1(P). The crystal field parameters evaluated areD q=630 cm−1,B=850 cm−1, andC=3600 cm−1. In assigning the location of Ni2+ ions within the lattice, evaluations are made of the (limited) extant comparable data. It is then concluded that Ni2+ enters an octahedral interstitial, rather than a substitutional, site. It is surrounded by four bromide ions, in a plane, with two polarized water molecules at the opposing fifth and sixth positions.
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  • 91
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    Journal of chemical crystallography 13 (1983), S. 273-278 
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    Notes: Abstract The crystal structure of CoCl(PMes3)3 has shown that the compound is not isostructural with its rhodium analogue. The title compound crystallizes in the cubic space groupPa 3 (No. 205) whereas the analogous Rh compound belongs to the triclinic space groupP ¯1. The cobalt derivative exhibits unit cell constanta=15.490(7) Å andZ=8 forDc=1.15 g cm−3. Full-matrix least-squares refinement gave a finalR value of 0.055 for 283 observed reflections. The Co-Cl bond in the molecule lies along a crystallographic three-fold axis with a Co-Cl distance of 2.21(1) Å. The unique Co-P distance is 2.240(6) Å.
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  • 92
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    Journal of chemical crystallography 13 (1983), S. 293-301 
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    Notes: Abstract The structure of the title compound (C22 H20O2S) is orthorhombic with space groupPca21,a=15.467(8),b=9.410(6),c=25.092(7) Å andZ=8. It has been solved by direct methods and refined by full-matrix least-squares techniques (phenyl rings as rigid bodies) to a conventionalR factor of 0.088 for 1056 reflections. There are only minor differences in the geometry of the two crystallographically nonequivalent molecules. The center ring of the molecule adopts a folded-boat conformation, with a very small angle (106°) between the two benzo-group planes of the (6,7,6) system.
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  • 93
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    Journal of chemical crystallography 13 (1983), S. 311-312 
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  • 94
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    Journal of chemical crystallography 13 (1983), S. 325-331 
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    Notes: Abstract The diacetic acid adduct of guanidinium tetrabromochromate(II) crystallizes in the monoclinic crystal system:a=8.778,b=9.125,c=12.195 Å,β=89.84°, space groupP21/n,Z=2. The structure was determined using the heavy atom method followed by Fourier methods and refined by full-matrix least-squares toR=0.061 for 2221 observed reflections. The structure contains discrete [CrBr4(HO2CCH3)2]2− anions separated by [C(NH2)3]+ cations. The chromium(II) atom is six-coordinate withtrans pairs of Cr-Br bonds of unequal length (2.84 and 2.63 Å), and two acetic acid molecules completing the coordination.
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  • 95
    ISSN: 1572-8854
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    Notes: Abstract The reaction of Au11[P(p-ClC6H4)3]7(SCN)3 with 1,3-bis(diphenylphosphino) propane (dppp) in methylene chloride leads to the formation of [Au11(dppp)5] (SCN)3 by a total substitution of the ligands. The compound crystallizes in the triclinic space groupP¯1,a=17.369,b=18.222,c=27.810 Å, α=104.00,β=105.25, γ=85.47°,Z=2. The structure was determined by a combination of Patterson, DIRDIF, and Fourier methods, with diffractometer data and refined by least-squares group refinement toR=0.081 for 2774 reflections.
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  • 96
    ISSN: 1572-8854
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    Notes: Abstract A redetermination of the crystal structure of the gold cluster [Au9{P(p-MeC6H4)3}8](PF6)3 has been performed. The compound crystallizes in the tetragonal space group P¯4n2, witha=20.283,c=20.330 Å, andZ=2. The structure was determined by a combination of Patterson and Fourier methods, with diffractometer data, and refined by least-squares methods toR=0.065 for 2435 reflections.
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  • 97
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    Journal of chemical crystallography 13 (1983), S. 373-379 
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  • 98
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    Journal of chemical crystallography 13 (1983), S. 381-384 
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    Notes: Conclusions Compared with most routine structure determinations, analyses of gold cluster compounds are very measuring-time, computer-time, and man-time consuming, and give less accurate results. However, they are equally useful and relevant as far as chemical information is concerned, even when only the gold skeleton and its connectivity with the ligands have been determined. TheR value is a poor guide to the value of a structure determination of this kind. One may even question whether one should take all possible precautions (change X-ray tubes, measure crystal faces, measure high-order reflection intensities) and try to locate light atoms, or perform three or more incomplete analyses of different compounds; certainly the latter gives more chemical information. Of course, none of the difficulties summarized in this note are unique for gold cluster compounds; the conclusions given here are valid generally.
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  • 99
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    Journal of chemical crystallography 13 (1983), S. 413-420 
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    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of [Co(NO)(ketox)2], where ketoxH is 2-hydroxyacetophenoneoxime, have been determined. This nitrosyl crystallizes in the orthorhombic system,a=14.741,b=6.853,c=32.442 A,Z=8, space groupPbca. The structure was determined by the heavy-atom method, using Mokα diffractometer data, and refined by full-matrix least squares toR=0.041 for 1768 observed reflections. The molecule excluding the nitrosyl group is approximately planar. The cobalt atom is 5-coordinate in an essentially square pyramidal arrangment with the basal plane defined bytrans bidentate oximato ligands between which are strong hydrogen bonds. The nitrosyl group occupies the apical position and the Co-N-O angle is 126.3°.
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  • 100
    ISSN: 1572-8854
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    Notes: Abstract The title compound is (μ-H)Ru3(CO)7(μ-As(C6H5)CH2As(C6H5)2)((C6H5)2 AsCH2As(C6H5)2)·CH2C12. Crystal data: monoclinic,P21/n, cell parameters (X-ray)a=12.82(2) Å,b=22.91(2) Å,c=17.83(2) Å, β=99.1(3)°; (neutron)a=12.94(1) Å, β=22.95(2)Å,c=17.93(3)Å,β=99.55(5)°. The structure was solved from X-ray data. FinalR indices areR(F)=0.051,R w (F)=0.049 (X-ray);R(F)=0.064,R w (F)=0.048,R(F 2)=0.072,R w (F2)=0.088 (neutron). The complex is derived from Ru3(CO)8(dpam)2 through reaction with hydrogen. The structure consists of a triangular array of metal atoms involving three metal-metal bonds[Ru(1)−Ru(2)=2.912(7)Å;Ru(1)−Ru(3)=2.829(3) A; Ru(2)−Ru(3)=2.845(6) Å]. The metal-metal edge Ru(1)−Ru(2) is supported by a bridging bis(diphenylarsino)methane ligand which lies in the equatorial plane. Activation of the second dpam ligand has generated the new face-bridging ligand unit μ-As(C6H5)CH2As(C6H5)2. In this unit, the bridgehead As atom spans over the Ru(1)−Ru(2) bond, while the second As atom is only bonded to Ru(3). The metal environment is achieved by CO ligands. The hydride ligand is bridging the Ru(1)−Ru(2) vector [Ru(1)−H=1.791(10) Å; Ru(2)−H=1.818(8) Å]. Geometric features of the dibridged Ru(μ-H)(μ-As)Ru bond are discussed.
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