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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 12 (1973), S. 1377-1385 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using Wilson's GF-matrix method as modified by Higgs for infinite helical polymers, dispersion curves and the frequency distribution function have been calculated for poly-L-proline II chain. Infrared spectrum is obtained and a Urey-Bradley force field, which provides best fit with the observed frequencies, is evaluated. The result are discussed from the viewpoint of the conformational characteristics of forms I and II.
    Additional Material: 3 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 11 (1972), S. 2091-2098 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A complete normal coordinate analysis, infrared absorption, and inelastic neutron scattering studies on α-glycylglycine are reported. A Urey-Bradley force field which is also valid for N-deuterated sample is obtained. Assignments in the low-frequency region are based on inelastic neutron spectrum obtained in one phonon and cubic approximation.
    Additional Material: 2 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 11 (1972), S. 2099-2108 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A normal coordinate analysis for cyclic tetra-L-alanine molecule is reported. A comparison of amide modes and other low-frequency vibrations sensitive to conformational changes is made with those in poly-L-alanine. Intramolecular coupling coefficients are calculated using perturbation treatment.
    Additional Material: 3 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 1965-1973 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dispersion curves and frequency distribution for poly-L-hydroxyproline (PLHP) chain were obtained using Wilson's GF matrix method as modified by Higgs. These are compared with those of poly-L-proline II and polyglycine II, which also have three-fold screw symmetry. Ring and skeletal modes characteristic of PLHP are identified and the assignments of observed infrared and Raman frequencies are reported. Urey-Bradley force constants were evaluated.
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 12 (1972), S. 317-322 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The dependence of true stress on the extension ratio of PVC threads has been determined for a wide range of extension rates. Since the polymer subjected to deformation was in the high-elastic state (at temperatures from 90 to 160°), the deformations were predominantly high-elastic. The dependence of true stress on the amount of high-elastic deformation is described by the Mooney-Rivlin equation.Relaxation moduli have been found on the basis of measurements of stress relaxation at constant deformation after various extension ratios were attained at different rates. Within the limits of deformation regimes at which the true stress is an increasing function of extension ratio the relaxation moduli do not depend on extension ratio and rate of extension. This enables one to arrive at a master curve of the relaxation modulus versus relaxation time with the reservation indicated above concerning the increasing character of the dependence of true stress on extension ratio. The relaxation spectrum represented by the high-elasticity plateau has been determined from the relaxation moduli according to the first approximation.The experimental data for a very wide range of deformation regimes and temperatures are presented in the form of an invariant dependence of the ratio of true stress to the rate of deformation on the product of deformation time by extension ratio.The ultimate strength of the specimens frozen rapidly after the attainment of definite extension ratios is determined by the accumulated high-elastic deformation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 569-576 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using pH-methods - direct titration according to Schwarzenbach, and ligand-ligand exchange - the stability constants of the complexes of divalent calcium, copper and zinc ions with the anions of triethylenetetramine hexaacetic acid have been determined. The complications arising by the interpretation of the experimental measurements of pH-values below 3.5 are discussed. These factors are normally not taken into account, and often wrong values of the equilibrium constants have been communicated.
    Additional Material: 2 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 362-366 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Wide line NMR investigation of solid phloroglucinol has been made over the temperature range 77 °K to 400 °K at the radio frequency 7.5 Mc/s. It has been shown that the second moments (mean square width) of the spectra for the temperatures at which the lattice is effectively rigid, namely below 290 °K are consistent with the assumed model of phloroglucinol, thereby giving an NMR check of the molecular structure of the sample. The rotation of the molecule is observed at all temperatures above 290 °K and the correlation frequencies for molecular reorientation are found to be in excess of 105 Hz. The activation energy is found to be 23.04 kcal/mole.
    Additional Material: 2 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 337-346 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Umsetzungen von Titanalkoxiden mit N-MethylaminoalkoholenN-Methylaminoalkoxide des Titans vom Typ Ti(OR)4-n(O · CHR′ · CH2 · NR″R‴)n, die durch Umsetzungen von Titanalkoxiden mit Aminoalkoholen dargestellt wurden, zeigten interessante Unterschiede in ihren Eigenschaften. IR- und PMR-Spektren wurden registriert sowie Austauschreaktionen mit Methanol und t-Butanol durchgeführt. Diese Aminoalkoxide werden mit Acetylchlorid gespalten und gehen Einschubreaktionen mit Phenylisocyanat ein, was ein erstes Beispiel für Einschubreaktionen bei solchen Verbindungen darstellt.
    Notes: N-methylaminoalkoxides of titanium of the type Ti(OR)4-n(O · CHR′ · CH2 · NR″R‴)n where R = Et and Pr1; n = 1-4; and R′ = R″ = H, R‴ = Me; R′ = H, R″ = R‴ = Me; R′ = R″ = R‴ = Me, synthesized by the reactions of titanium alkoxides with aminoalcohols, show interesting variations in their properties like physical state, volatility and molecular complexity. I.r. and p.m.r. spectra of these derivatives have been recorded. A few interchange reactions with methanol and tert-butanol have also been carried out. These aminoalkoxides get cleaved with acetyl chloride and undergo insertion reactions with phenylisocyanate, thus providing the first examples of insertion reactions in such derivatives.
    Additional Material: 5 Tab.
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 1 (1973), S. 513-519 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A study of the infrared and Raman spectra of single crystals and powders of ZnGa2O4 yields the following k = 0 phonon frequencies: 175 cm-1 (T1u), 328 cm-1 (T1u), 420 cm-1 (T1u), 570 cm-1 (T1u), 467 cm-1 (T2g), 611 cm-1 (T2g), 638 cm -1 (Eg) and 714 cm-1 (A1g).The results are compared with the frequencies of the vibronic sidebands of the Cr3+ R line emission as observed in ZnGa2O4: Cr3+. It is found that the strogest vibronics of the R lines are due to coupling of the Cr3+ electrons with the T1u modes of the ZnGa2O4 lattice, especially with the two higher frequency T1u modes.
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 493-495 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman scattering from polaritons in organic biaxial crystal m-dinitrobenzene has been observed by a photographic method. In order to obtain a greater shift of polaritons the directional dispersion of the incident wave vector has been taken into account, so that the polariton disperison curves over the range from 500 cm-1 to 3500 cm-1 have been observed.
    Additional Material: 1 Ill.
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