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  • 1960-1964  (4)
  • 1
    Electronic Resource
    Electronic Resource
    A refinement of the crystal structure of potassium imidodisulphate (1963)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 16 (1963), S. 877-883 
    Details
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0365110X63002371
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen Bonding in Calcium Orthophosphates (1962)
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 1090-1091 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In dicalcium 6is(dihydrogen phosphate) mono-hydrate3, Ca(H2PO4)2.H2O, we find that the distances between oxygens in phosphate groups which we believe to be hydrogen-bonded cover the range from 2-48 0-03 A to 2-87 0-05 A with infra-red peaks at 2,320, 2,430, 2,670, 2,920, 3,160, and 3,450 cm-1. In ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1951090a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Proton magnetic resonance absorption in dry nylons 66 and 610 (1962)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 59 (1962), S. 271-281 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A comparison of the temperature dependence of the nuclear resonance line-width and second moment for dried chip and rod samples of nylon 66 and 610, as measured by several authors, reveals discrepancies within the range 80 to 400°K. Room temperature measurements with a Pound-Watkins spectrometer suggest that neither linewidth nor second moment varies greatly with radiofrequency field, although saturation may occur at low temperatures. It is concluded that the nuclear resonance differences reflect sample differences, at least for the higher temperatures. Evidence is considered for the decomposition of the continuous nuclear resonance changes in polyamides into more discrete “transitions;” in nylon 66, there are nuclear resonance effects near 120, 200, 330, and 370°K.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1962.1205916805
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Crystalline modifications of cellulose. Part V. A crystallographic study of ordered molecular arrangements (1960)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 42 (1960), S. 173-188 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: With the arrangements of molecular chains postulated in Part III as a basis, crystal structures for the ordered regions of ramie and regenerated celluloses have been set up. Comparison of the (hkl) x-ray intensities calculated for cellulose I structures with the measurements reported in Part IV reveals serious discrepancies on the first layer-line. From extensive calculations over a range of structures, it appears that no conventionally ordered structure built from a P21 unit cell of approximate dimensions 8.2 × 10.3 × 7.9 A., β = 84°, can be expected to yield as weak (h1l) planes as are observed. An element of randomness in the polarity of the chains would diminish the discrete intensities on the higher layers relative to the (h0l) reflections and so be more in accord with experiment. For cellulose II, attention was concentrated on antiparallel chain structures with the r shift near 0.29. Although the overall agreement was better than for cellulose I, such structures did not account for the very weak low-order (h1l) reflections observed. The disparity was not reduced by types of disordering acceptable on stereochemical and spectroscopic grounds. The major part of the disagreement is tentatively attributed to regarding the observed coherent scattering as emanating from fully ordered unit cells of the accepted dimensions and symmetry, and to neglecting contributions from oriented amorphous regions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1960.1204213920
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    Paper (German National Licenses)
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