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  • Articles  (3,976)
  • Springer  (2,384)
  • American Geophysical Union  (1,592)
  • 1970-1974  (3,976)
  • 1935-1939
  • 1974  (3,976)
  • Geosciences  (3,635)
  • Architecture, Civil Engineering, Surveying  (711)
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  • Articles  (3,976)
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Keywords
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  • 1970-1974  (3,976)
  • 1935-1939
Year
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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of the laser Raman and far-ir spectra of dibenzyl and poly-p-xylylene (1974)
    Springer
    Journal of chemical crystallography 4 (1974), S. 23-29 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The infrared and laser Raman spectra of dibenzyl and poly-p-xylylene in the 20–650 cm−1 region are compared with each other. New laser Raman data for poly-p-xylylene below 200 cm−1 have been obtained using an argon-ion laser (4880 Å) and photon counting detection techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209533
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of bis(protonated thiamine) tetrachlorodioxouranium(VI) (1974)
    Springer
    Journal of chemical crystallography 4 (1974), S. 1-14 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of bis(protonated thiamine) tetrachlorodioxouranium(VI), [C12H18ClN4OS]2 UO2Cl4, has been determined from three-dimensional X-ray diffractometer data. The crystals are monoclinic:P21/n,a = 11.199,b = 6.968,c = 23.675 Å, β = 97.50°,Z = 2. The structure was determined by Fourier methods and refined by least squares toR = 0.062, using 1675 observed reflections. The structure contains octahedral [UO2 Cl4]2−ions with average U-Cl and U-O distances of 2.67(1) and 1.78(1) Å, respectively. The organic portion of the molecule resembles that of previously reported thiamine structures. The failure to find the hydrogen atoms no doubt prevented our determining either which nitrogen atom is protonated or, with certainty, the hydrogen-bonding distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209531
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 24,25-dibromolanost-8-en-3β-yl acetate ‘A’ (1974)
    Springer
    Journal of chemical crystallography 4 (1974), S. 31-42 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of the thermodynamically more stable isomer of 24,25-dibromolanost-8-en-3β-yl acetate, the ‘A’ form, has been solved by the heavy-atom method and refined by full-matrix least-squares methods to a finalR-value of 0.153 for 2354 reflections. The crystals are orthorhombic:P212121,a = 40.889,b = 9.990,c = 7.839Å,Z = 4. Some difficulties were encountered owing to both radiation damage and the unusual positions of the bromine atoms. The analysis shows the configuration at C(24) to be 24S, and the rest of the structure does not reveal any unexpected features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209534
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  • 4
    Electronic Resource
    Electronic Resource
    Editorial note (1974)
    Springer
    Journal of chemical crystallography 4 (1974), S. i 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01374432
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  • 5
    Electronic Resource
    Electronic Resource
    Isomer assignments in thep-dimethylaminoazoxybenzenes, and the crystal structure of β-p-dimethylaminoazoxybenzene (1974)
    Springer
    Journal of chemical crystallography 4 (1974), S. 187-191 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197913
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  • 6
    Electronic Resource
    Electronic Resource
    The Poranthera corymbosa alkaloids, II (1974)
    Springer
    Journal of chemical crystallography 4 (1974), S. I 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197915
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  • 7
    Electronic Resource
    Electronic Resource
    Proton magnetic resonance spectrum of phenylacetylene dissolved in a nematic phase (1974)
    Springer
    Journal of chemical crystallography 4 (1974), S. 193-198 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The proton magnetic resonance spectrum of phenylacetylene dissolved in a nematic phase has been recorded, and analysed in terms of dipolar coupling and chemical shifts. The spectrum is particularly well resolved, and accurate relative interproton distances are derived. The results have been compared with those of a previous study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198176
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  • 8
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of the alkaloid papaverine hydrochloride (1974)
    Springer
    Journal of chemical crystallography 4 (1974), S. 213-225 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of the benzylisoquinoline alkaloid papaverine hydrochloride, C20H21NO4. HCl, has been determined with CuKα diffractometer data by direct methods. The compound crystallizes in the monoclinic space groupP21/c (No. 14) witha= 13.059(3),b = 15.620(3),c = 9.130(2) Å and β = 92.14(1) °. The structure was refined by full-matrix least-squares methods toR = 0.052 using all 2652 reflections. The nitrogen atoms is protonated and forms a strong hydrogen bond with the chloride ion, the N ... Cl distance being 3.01 Å. The isoquinoline ring is slightly non-planar but the benzene ring is planar within experimental error. The dihedral angle between the benzene ring and the best plane through the isoquinoline group is 109 °. The molecular structure of papaverine is of interest in gaining a better understanding of its pharmacological action on smooth muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198178
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  • 9
    Electronic Resource
    Electronic Resource
    Crystal structure of 2,4-di-para-methoxyphenylcyclobutadiene-1,3-quinone (1974)
    Springer
    Journal of chemical crystallography 4 (1974), S. 199-212 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of 2,4-di-p-methoxyphenylcyclobutadiene-1,3-quinone has been been determined using three-dimensional X-ray data collected by means of a Picker FACS-1 four-circle diffractometer. The crystal used was one of four modifications of this compound, two low density (1.38 g cm−3) and two high density (1.54 g cm−3) forms, obtained by us, depending on crystallization conditions. The space group isP¯1, with unit cell dimensionsa = 3.89,b = 10.80,c = 9.03 Å, α = 77.88, β = 74.12, γ = 85.15 °D m = 1.38 g cm−3 andZ = 1. A least-squares refinement of the positional and anisotropic thermal parameters gave a finalR-value of 6.0% for 364 reflections and 121 variables. The zwitter-ionic nature of the molecule can be seen in both the partial delocalization of the bonds in the 4-membered ring (which is square-planar) and the bonds joining thep-phenylene and 4-membered rings. The nearly planarp-phenylene rings themselves are quinone-like in structure and are parallel, but not coplanar. The columnar packing of the molecules resembles that of graphite, and observed interplanar spacing is 3.64 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198177
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  • 10
    Electronic Resource
    Electronic Resource
    Application of theB2,0 andB3,0 formulae to the structure determination of a photodimer ofo-distyrylbenzene, C44H36 (1974)
    Springer
    Journal of chemical crystallography 4 (1974), S. 227-242 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A simple application of theB3,0 formula is described. This formula is used mainly to avoid inconsistent Σ2-interactions in standard symbolic-addition or multiple-solution techniques. Computer time is reduced by a reflection selection procedure based upon the use of theB2,0 formula. The solution of a centrosymmetric structure is described. This compound, a photodimerization product ofo-distyrylbenzene, is 5,6,11,12-tetraphenyl-dibenzo[2–3,8–9] tricyclo[8,2,0,04,7] dodecadiene-2,8, C44H36. The compound crystallizes in the monoclinic space groupC2/c, with unit cell parametersa = 28.047,b = 9.504,c= 12.600 Å and β = 103.4 °. A rather poor set of data was collected by an automatic diffractometer. Structural parameters were refined by full-matrix least-squares methods to anR-value of 0.06 for 970 non-zero reflections. The molecule is situated on a twofold rotation axis. It containscis-, trans-, cis-substituted puckered cyclobutane rings. The dihedral angle between the benzo-groups is 61.5 °.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198179
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