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  • Chemistry  (3)
  • 1970-1974  (2)
  • 1955-1959  (1)
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Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Molecular motion in poly(β-benzyl-L-aspartate) (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 2039-2048 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: As the temperature of solid poly(β-benzyl-L-aspartate) (PBLA), (CO.NH.CH.-CH2COOCH2C6H5)n, in the α-helieal form is raised from -150 °C, tlie line width and second moment of the proton magnetic resonance (PMR) signal decrease in stages until the conformational transition to the ω-helix occurs at about 90 °C. A similar temperature dependence of the PMR parameters is observed as the transformed polymer is cooled. Below -100°C (where the lattice is presumed to be rigid), the measured second moments are 9.5 Oe2 and 10.7 Oe2 for the α and ω forms, respectively. Second moments, calculated from the Van Vleck formula for the rigid lattice and also estimated for possible motional cases in which the polymer is taken to be in the ω form, are compared with the PMH data. By combination with the results of X-ray diffraction and infrared spectroscopic measurements, a tentative explanation can be made of the types of motion occurring in PBLA.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360101019
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  • 2
    Electronic Resource
    Electronic Resource
    High-resolution nuclear magnetic resonance spectra of phenanthrenes-IVFor part III, see Ref. 1. Phenyl derivatives of phenanthrene (1970)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 259-270 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton magnetic resonance spectra at 60 MHz are reported for 9, 9′-biphenanthryl, 1-phenylfluoranthene, 9-benzylphenanthrene, 1-, 4- and 9-phenylphenanthrenes and 9-methyl-10-phenylphenanthrene, all in CS2 solution. Approximate values of some of the chemical shifts and coupling constants were extracted from the overlapped and often collapsed AB, ABC ABCD and AA′BB′C (phenyl) spin systems. By comparison with data for phenanthrene itself, estimates have been made for the dihedral angle, θ, between the planes of the phenyl ring and the phenanthrene nucleus in phenylphenanthrenes. These lead, except for 9-phenylphenanthrene for which the angle derived from H(10) by PMR is higher than UV suggests, to plausible values for θ: 90°, 75°, 40° and 45 to 60°, for 4-phenyl, 9-methyl-10-phenyl-, 1- and 9-phenylphenanthrenes, respectively.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270020306
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  • 3
    Electronic Resource
    Electronic Resource
    Crystalline modifications of cellulose. Part III. The derivation and preliminary study of possible crystal structures (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 32 (1958), S. 371-394 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Scale models are described for a stereochemical study of the cellulose chain assuming standard armchair β-glucose residues crystallizing in space-group P21. Infrared evidence about the hydrogen bonding and intensity data for the strongest equatorial and meridional x-ray reflections are utilized in assessing the validity of many models. The structures published by Meyer and Misch and by other workers do not comply with the criteria thus set up. Some fully hydrogen bonded structures, which are likely to form the basis of the most highly ordered regions in cellulose I and II, are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1958.1203212508
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