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  • Articles  (15)
  • crystal structure  (15)
  • Springer  (15)
  • Annual Reviews
  • PANGAEA
  • 1990-1994  (15)
  • 1980-1984
  • 1991  (15)
  • Chemistry and Pharmacology  (15)
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  • Articles  (15)
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  • 1990-1994  (15)
  • 1980-1984
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  • 1
    Electronic Resource
    Electronic Resource
    The characterization of high-tech materials: Perspectives, challenges, trends (1991)
    Springer
    Microchimica acta 104 (1991), S. 177-214 
    Details
    ISSN: 1436-5073
    Keywords: atomic structure ; crystal structure ; microstructure ; constructions ; topochemistry ; graphite ; glassy carbon ; pyrolytic carbon ; microelectronics ; carriers of information ; refractory metal alloys ; life time ; recrystallization ; fatigue ; photon probe techniques ; electron probe techniques ; ion probe techniques ; electrical field probes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract From the Stone Age on, developmental periods of mankind carry the names of materials. Materials determine the applicability of key technologies and these are in turn of major significance for the economic success and the social development in modern society. Today's high-tech materials are the consequence of an improved understanding of the structure and composition of matter and of the interplay of microstructure and minor and trace constituents. We can distinguish four basic dimensional structural categories of materials: (a) the atomic structure level; (b) the crystal, glassy or amorphous structural level; (c) the microstructural level; (d) the level of constructions. As an example, these structural levels are described in some detail for graphite, a material used extensively throughout Analytical Chemistry. Decisive differences at the microstructural level result in graphitic materials with very varying properties: polycrystalline electrographite, glassy carbon, and pyrolytic graphite. Examples for the use of these materials in ETAAS are discussed. Structural features together with topochemical and trace chemical characteristics are studied today by a wide variety of analytical instrumentation and methods of modern materials analysis which can be grouped into four categories of techniques: (a) photon probe techniques; (b) electron probe techniques; (c) ion probe techniques; (d) electrical field probes. The most important of those techniques are discussed shortly with respect to their main characteristics as lateral and depth resolution, detection sensitivity, additional bonding or structural information, depth profiling possibilities etc. The constructions are the ultimate level of a materials structure. Structures of microelectronic components reach dimensionally into the domain of microstructure whereas constructions in heavy industry are of meter-ton dimensions. Progress in the use of materials as carriers of information is visualized by a morphological comparison of the sound tracks of conventional records with the information imprinted in optical discs. It is important to conceive materials as dynamic systems with limited lifetime. Fatigue and recrystallization are prominent relevant phenomena which must be studied by microstructural and topochemical methods. Dispersion strengthened microalloys like TZM, HT-molybdenum and NS-tungsten are discussed as examples how materials can be improved with respect to their extended use under extreme conditions. Again, a thorough structural and topochemical characterization was the basis of a successful respective materials development although a multitude of relevant topochemical questions still remain to be solved. Lifetime investigations are an essential tool of materials development as well as quality control. Relevant investigations for various tube materials for ETAAS are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245508
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  • 2
    Electronic Resource
    Electronic Resource
    Conformational analysis of fluorinated copolymers of tetrafluoroethylene (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 477-482 
    Details
    ISSN: 1435-1536
    Keywords: Polytetrafluoroethylene ; copolymers ; conformation ; conformational disorder ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Conformational analysis of fluorinated copolymers of tetrafluoroethylene (TFE) is performed by taking into account only intramolecular effects (isolated-chain model). In particular, variations of the chain conformation, which are induced by incorporating different side groups, such as −Cl, −CF3, −OCF3, −OCF2CF3, and −OCF(CF3)2, are investigated and discussed with respect to qualitative correlations between conformation, crystal structure, and supramolecular morphology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655885
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  • 3
    Electronic Resource
    Electronic Resource
    Atomistic calculations of crystal structures of polyisobutylene (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 449-454 
    Details
    ISSN: 1435-1536
    Keywords: Polyisobutylene ; atomistic calculations ; conformational analysis ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Semiempirical atomistic calculations are performed to investigate the crystalline structure of stretched poly(1,1-dimethylethylene), or polyisobutylene. The packing analysis was done without any lattice symmetry assumptions. The results are in good agreement with the x-ray analysis and favor Tanaka's model II. The calculations show several other crystalline structures with the chains in an all-gauche conformation. They have a somewhat higher density and may play a role in a hypothetical high-pressure phase of polyisobutylene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655881
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  • 4
    Electronic Resource
    Electronic Resource
    Structural studies of 2,2-Diphenyl-1-picrylhydrazine: A clathrate forming compound (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 10 (1991), S. 203-217 
    Details
    ISSN: 1573-1111
    Keywords: Diarylpicrylhydrazine ; clathrate ; single crystal ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract 2,2-Diphenyl-1-picrylhydrazine was crystallized from both tetrahydrofuran and chloroform. The crystal structures of samples from both preparations were determined by X-ray diffraction at low temperatures. Both crystals are clathrates with solvent molecules included as guest species in a host framework formed by the diphenylpicrylhydrazine molecules. The structures are rhombohedral, space groupR3. For the crystal from tetrahydrofuran, at 228 K,a = 25.820(4),c = 15.096(2) Å,Z = 18,R = 0.084 andwR = 0.133. For the crystal from chloroform, at 115 K,a = 25.453(12),c = 15.083(3) Å,Z = 18,R = 0.117 andwR = 0.153. Each unit cell contains three cavities which have approximate cylindrical shape with diameter 7.8 Å and height 6.0 Å, and 3 point symmetry. The integrity of the host framework is maintained only through van der Waals forces rather than through intermolecular hydrogen bonding as is found in many other known organic cathrates. The conformation of the trinitroanilino group of the hydrazine molecule is similar to that in the related trinitroanilinocarbazole molecule. The N-N bond approximates a single bond, and both hydrazine N atoms aresp 2 hybridized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01066204
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  • 5
    Electronic Resource
    Electronic Resource
    Channel inclusion of potassium and tetrachloroplatinate ions in a complex formed between 1,3-diamino-2-propanone and K2PtCl4 in an acidic medium (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 10 (1991), S. 225-232 
    Details
    ISSN: 1573-1111
    Keywords: Diaminopropanone ; potassium tetrachloroplatinate ; channel inclusion ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystalline complex dipotassium 1,3-diammonio-2-propanone tetrachloroplatinate trihydrate, formulated as K2[(NH3CH2C)2O][PtCl4]2 · 3H2O, has been prepared while synthesizing complexes analogous tocis-dichlorodiamine Pt(II). Its structure is orthorhombic, space groupPnma,M r = 896.1,F(000) = 1640,a = 8.428(4),b = 20.360(10),c = 12.141(7)A,V = 2083.3Å3,Z = 4,D x = 2.860 g cm−3, μ(MoK x) = 196 cm−1, finalR = 0.083 for 1379 unique reflections. The structure consists of a very extended hydrogen bonded network which involves half of the PtCl4 2− ions, the organic molecules and the water molecules of hydration, leaving large oval channels which accommodate potassium cations and tetrachloroplatinate anions. Within the channel the potassium and tetrachloroplatinate ions pack in columns extending along the a axis. The dense packing is rather reminiscent of that found in the neat salt where each potassium ion is surrounded by six chlorine atoms which describe a polyhedron of a distorted trigonal prism with K+ —C1 distances ranging between 3.163–3.187 Å. There is some indirect evidence for the formation of 1,3-diammonio-2-propanone dications which counterbalance the charges of half of the PtCl4 2− ions by protonation of each of the amino nitrogens. The carbonyl oxygens, however, are involved only in a very weak O-C-O interactions along thea axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01066206
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  • 6
    Electronic Resource
    Electronic Resource
    Molecular encapsulation of transition metal complexes in cyclodextrins. Part 2. Synthesis and crystal structures of 2:1 adducts between α-cyclodextrin and metallocenium hexafluorophosphates [η5-C5H5)2M]PF6(M = Fe, Co, Rh) (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 10 (1991), S. 255-265 
    Details
    ISSN: 1573-1111
    Keywords: Cyclodextrin inclusion compound ; metallocene ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The title metallocenium salts form crystalline 2:1 host:guest inclusion compounds withα-cyclodextrin, [(η5-C5H5)2M]PF6 · 2α-CD · 8H2O (1, M = Fe;2, M = Co;3, M = Rh). The X-ray crystal structures of1 and3, and the lattice constants, crystal system and space group of2 have been determined. Crystal data: triclinic, space groupP1 (No. 1),Z = 1;1,a = 13.865 (2) Å,b = 13.839 (2) Å,c = 15.520 (2) Å,α = 91.43 (2)°,β = 85.81 (2)°,γ = 120.22 (2)°, andR F = 0.089 for 4257 observed MoK α reflections [I 〉 3δ(I)];2,a = 13.810 (2) Å,b = 13.872 (2) Å,c = 15.560 (2) Å,α = 93.99 (2)°,β = 87.06 (2)°,γ = 120.04 (2)°;3,a = 13.756 (1) Å,b = 13.863 (1) Å,c = 15.561 (2) Å,α =94.39 (1)°,β = 86.92 (1)°,γ = 119.89 (1)°, andR F = 0.061 for 11142 observed MoK α reflections [I 〉 3δ(I)]. In the crystals of1 and3, two α-cyclodextrin molecules are arranged head-to-head to form a dimer by means of intermolecular hydrogen bonding across the secondary hydroxyl faces of adjacent α-CD monomers. The dimers are stacked along the crystallographicc axis to form a channel-type structure. The metallocenium cation is encapsulated within the cavity of the dimer, while the PF 6 − anion is located outside the cavity, being centered between the primary hydroxyl faces of adjacent dimers. Eight water molecules of hydration per asymmetric unit reside in the spaces between the α-CD columns. In view of the almost identical crystal data for2 a similar structure can be assumed for the cobaltocenium adduct.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01066209
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  • 7
    Electronic Resource
    Electronic Resource
    The crystal structures of α, ω-diaminoalkanecadmium(II) tetracyanonickelate(II)-Aromatic molecule inclusion compounds. V. Toluidine clathrates of the hosts built of the diamines, 1,4-diaminobutane, 1.5-diaminonentane, and 1,8-diaminooctane (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 11 (1991), S. 137-152 
    Details
    ISSN: 1573-1111
    Keywords: cadium ; crystal structure ; Hofmann-diam-type ; 1,4-diaminobutane ; 1,5-diaminopentane ; 1,6-diaminohexane ; 1,8-diaminooctane ; tetracyanonickelate ; toluidine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystal structures have been analyzed for the threeo-toluidine clathrates,catena-[catena-μ-(1,4-diaminobutane)cadmium(II) tetra-μ-cyanonickelate(II)]-o-toluidine(2/3),4-o,catena-[catena-μ-(1,5-diaminopentane)cadmium(II) tetra-μ-cyanonickelate(II)]-o-toluidine(3/4),5-o, andcatena-[catena-μ-(1,8-diaminooctane)cadium(II) tetra-μ-cyanonickelate(II)]-o-toluidine(1/1),8-o, for am-toluidine onecatena-[catena-μ-(1,5-diaminopentane)cadmium(II) tetra-μ-cyano-nickelate(II)]-m-toluidine(1/1),5-m, and for ap-toluidine onecatena-[catena-μ-(1,8-diaminooctane)cadium(II) tetra-μ-cyanonickelate(II)]-p-toluidine(1/1),8-p. 4-o crystallizes in the triclinic space groupPī,a/Å = 9.806(3),b/Å = 14.388(3),c/Å = 7.725(2), α/° = 89.71(2), β/° = 89.96(2), γ/° = 98.12(2),V/Å3 = 1078.8(5),Z = 2, 3750 reflections,R = 0.056;5-o: tetragonalP4lmmm, (a = b)/Å = 7.485(7),c/Å = 10.06(3),V/Å3 = 563(2),Z = 1, 573 reflections,R = 0.19;8-o: monoclinicP2/m,a/Å = 11.513(4),b/Å = 7.626(1),c/Å = 7.101(1), β/° = 109.63(3),V/Å3 = 587.2(2),Z = 1, 1682 reflections,R = 0.058;5-m: orthorhombicPbam,a/Å = 12.254(6),b/Å = 20.62(1),c/Å = 7.804(1),V/Å3 = 1972(1),Z = 4, 2240 reflections,R = 0.059; and8-p: triclinic,Pī,a/Å = 11.52(1),b/Å = 7.632(3),c/Å = 7.039(4), α/° = 88.93(4), β/° = 109.71(5), γ/° = 82.81(9),V/Å3 = 576.9(6),Z = 1, 2598 reflections,R = 0.042. Their structures are substantially similar to the already-known structure ofcatena-[catena-μ-(1,6-diaminohexane)cadmium(II) tetra-μ-cyanonickelate(II)]-o-toluidine(1/1): the guest toluidine molecules are accommodated in the cavities formed betweencatena-[cadmium(II) tetra-μ-cyanonickelate(II)] layers bridged by the ambidentate α,ω-diaminoalkane ligands at the cadmium(II) atoms. The carbon chain length of the α,ω-diaminoalkane influences the number of cavities per formula unit and the deformation of the metal complex layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153297
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  • 8
    Electronic Resource
    Electronic Resource
    Crystal and molecular structures ofp-(1,1,3,3-tetramethylbutyl)calix[5]arene and its 1 : 1 complex with toluene (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 11 (1991), S. 171-183 
    Details
    ISSN: 1573-1111
    Keywords: Calixarene ; inclusion compounds ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A cyclic pentamer was obtained fromp-(1,1,3,3-tetramethylbutyl) phenol. It crystallizes from a mixture of acetone and toluene at room temperature giving a 1 : 1 complex with toluene (compound A), whereas at 50°C the empty form (compound B) is obtained. Crystals of A are orthorhombic, space groupPna21,a = 20.083(2),b = 12.936(6),c = 28,423(1) Å,Z = 4, finalR value = 0.067. The empty form, B, is monoclinicP21/c,a = 18.695(2),b = 11.673(5),c = 35.100(4) Å, β = 114.33(1),Z = 4, finalR value = 0.135. The macrocycle is in the cone conformation for both compounds; the toluene molecule lies in the cone as often found for calix[4]arenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153300
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  • 9
    Electronic Resource
    Electronic Resource
    Novel cage-like cavity accommodating a pair of guest molecules in the structure ofcatena-[dl-1,2-diaminopropanecadmium(II) tetra-μ-cyanocadmate(II)]-(1,2-dichloroethane)(1/1) (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 11 (1991), S. 397-403 
    Details
    ISSN: 1573-1111
    Keywords: Cadmium cyanide ; cadmium tetracyanocadmate ; crystal structure ; dichloroethane ; metal complex host ; propylenediamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The title clathrate Cd(dl-pn)Cd(CN)4·CH2CICH2CI (pn=dl-1,2-diaminopropane=dl-propy-lenediamine) crystallizes in the monoclinic space groupP2 ,a = 8.278(2),b = 14.904(2),c = 14.477(1) Å,β = 91.24(1)°,V = 1785.7(1) Å3,Z = 4,R = 0.068 for 4993 independent reflections. A novel three-dimensional host is built of the alternate array of the pn-chelated octahedral Cd and the tetrahedral Cd(CN)4 linked at every N atom to the former Cd to provide a cage-like cavity for a pair of 1,2-dichloroethane guest molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041417
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  • 10
    Electronic Resource
    Electronic Resource
    X-Ray Structure and Crystal Lattice Interactions of the Taxol Side-Chain Methyl Ester (1991)
    Springer
    Pharmaceutical research 8 (1991), S. 908-912 
    Details
    ISSN: 1573-904X
    Keywords: taxol side chain ; crystal structure ; crystal lattice interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A colorless, parallelepiped crystal of methyl (2R,3S)-N-benzoyl-3-phenylisoserinate belonging to the space group P2l with a = 5.414(4), b = 7.813(1), c = 17.802(7) Å, β = 90.87(4)°, Z = 2, V = 752.9 Å3, D calc = 1.32 g cm−3, and µcalc = 1.02 cm−1 was selected and the structure solved using direct methods. Refinement led to a final R = 0.079 for 819 [F o ≥ 5σ(Fo)] reflections. Intermolecular hydrogen-bonding interactions are prevalent in the crystal lattice of this compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1015863814901
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  • 11
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure ofN,N′,N″-tritosyl-5,8,14,17,23,26-hexamethyl-2,11,20-triaza[3.3.3]-paracyclophane 1 : 1 dichloromethane clathrate (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 11 (1991), S. 41-48 
    Details
    ISSN: 1573-1111
    Keywords: N-tosyl azamacrocycles ; crystal structure ; clathrate formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystal and molecular structure of the title compound, C51H57N3O6S3·CH2Cl2 has been determined by single crystal X-ray analysis and refined to anR-value of 0.069 for 1032 reflections. The crystal is trigonal, space groupR3, witha = 21.255(7),c = 11.317(4), andZ = 3. One molecule of dichloromethane used as solvent is enclathrated in the crystal lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01073682
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  • 12
    Electronic Resource
    Electronic Resource
    Air stable liquid clathrates: Solid state structure and hydrocarbon solubility of organic cation triiodide salts (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 11 (1991), S. 103-114 
    Details
    ISSN: 1573-1111
    Keywords: Liquid clathrate ; triiodide ; NMR ; crystal structure ; molten salts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of air and water stable organic cation triiodide salts have been prepared and characterized. Almost all of the salts isolated sustain liquid clathrate phases in the presence of benzene or toluene, the compositions of which were determined via1H NMR spectroscopy. Two of the salts were also characterized via X-ray crystallography in order to determine the nature of any solid state interionic interactions (1-ethylpyridinium triiodide, monoclinic,P21/c,a = 9.6031(7),b = 15.129(3),c = 8.8160(16) Å, β = 104.192(11)°,Z = 4,R = 0.041 for 2463 independent observed reflections; 1,2,4-trimethylpyridinium triiodide, orthorhombic,Pbcm,a = 9.434(4), 20.176(4), 7.411(4) Å,Z = 4,R = 0.045 for 966 observed reflections).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153294
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  • 13
    Electronic Resource
    Electronic Resource
    Thermoanalytical investigation of the guest-release process in aromatic-guest clathrates of three-dimensional metal complex hosts (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 10 (1991), S. 29-37 
    Details
    ISSN: 1573-1111
    Keywords: activation energy ; benzene ; cadmium complex ; crystal structure ; ethylenediamine ; guest-release process ; propylenediamine ; pyrrole ; tetracyanocadmate ; tetracyanomercurate ; tetracyanonickelate ; thermal analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The guest-release process was investigated in terms of the activation energy evaluated by thermogravimetry for the en-Td-type clathratescatena-μ-[catena-μ-(ethylenediamine)cadmium(II) tetra-μ-cyanocadmate(II) or -mercurate(II)]-benzene(1/2), -benzene-d 6(1/2), and -pyrrole(1/2), the Hofmannen-type clathratescatena-[catena-μ-(ethylenediamine)cadmium(II) tetra-μ-cyanonickelate(Il)]-benzene (1/2) and -pyrrole(1/2), the Hofmann-pn-type clathratecatena-[catena-μ-(dl- orl-propylenediamine (cadmium(II) tetra-μ-cyanonickelate(II)]-pyrrole(2/3), and the pn-Td-type clathratescatena-[catena-μ-(dl-propylenediamine) or -(l-propylenediamine)cadmium(II) tetra-μ-cyanocadmate(II)]-benzene(2/3). Values of the activation energy are correlated with the structural change in the metal complex host accompanied by the release of the guest molecules. The crystal structure ofcatena-[ethylenediaminecadmium tetra-μ-cyanonickelate(II)], the residual host of the Hofmann-en-type, has been analyzed to elucidate the correlation.
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    URL: http://dx.doi.org/10.1007/BF01041637
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  • 14
    Electronic Resource
    Electronic Resource
    Stabilization of H2O ⁗ BF3 by hydrogen bonding to 18-crown-6 (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 10 (1991), S. 153-158 
    Details
    ISSN: 1573-1111
    Keywords: Hydrogen bonding ; 18-crown-6 ; boron trifluoride ; water ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The decomposition of H2O ⁗ BF3 in both the solid and solution states is rapid at room temperature, but 18-crown-6 ⁗ H2O ⁗ BF3,1, is stable to its melting point, 72°C.1 crystallizes in the monoclinic space groupC2/c witha = 27.273(9),b = 8.432(5),c = 22.936(9) Å, β = 128.33(4)°, andD c = 1.27 g cm−3 forZ = 8. Least-squares refinement based on 1409 observed reflections led to a finalR = 0.083. The BF3 is covalently bonded to the oxygen atom of the water molecule which in turn is hydrogen bonded to the 18-crown-6.
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    URL: http://dx.doi.org/10.1007/BF01041648
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  • 15
    Electronic Resource
    Electronic Resource
    Molecular structures of complexes of rare-earth metals with benzo-12-crown-4 (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 10 (1991), S. 191-202 
    Details
    ISSN: 1573-1111
    Keywords: Crown ethers ; rare-earth metals ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An X-ray diffraction study of the complexes [Nd(N03)3(Bl2C4)] (I), [La(NO3)3(Bl2C4)(H2O)]·MeCN (II), and [Er(NO3)3(H2O)3]·2(Bl2C4)·MeCN (III), (B12C4 = benzo-12-crown-4) has been carried out. Crystals ofI are monoclinic,a = 8.050(2),b = 29.92(1),c = 7.741(2) Å,β = 102.71(2)°, space groupP21/c,Z = 4,R = 0.047 for 4718 reflections. Crystals of II are triclinic,a = 8.211(2),b = 10.613(3),c = 12.837(4)Å,a = 94.46(3),β = 108.19(2), γ = 89.98(3)°, space groupPT,Z = 2,R = 0.037 for 5611 reflections. Crystals ofIII are monoclinic,a = 9.847(3),b = 17.201(4),c = 21.664(5)Å,β = 100.85(2)°, space groupP21/n,Z = 4,R = 0.040 for 8328 reflections. The chemical structures of the complexes have been elucidated. The correlation between the radius of a particular lanthanide-ion and its coordination number (10 inI, 11 inII and 9 inIII) and consequently its influence on the composition of the complex is discussed. The possibilities of conformational changes in the B12C4 molecule depending on the type and size of the coordinated moiety (ions Nd(III) and La(III) inI andII and the H2O molecule inIII) are considered.
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    URL: http://dx.doi.org/10.1007/BF01066203
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