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  • 1
    Electronic Resource
    Electronic Resource
    Heat capacity and phonon dispersion in poly(L-methionine) (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 2281-2292 
    Details
    ISSN: 0887-6266
    Keywords: conformation ; phonon dispersion ; α-helix ; normal modes ; poly(L-leucine) ; density of states ; heat capacity ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(L-methionine) (PMet) is one of the two sulfur containing polyamino acids. Raman, FTIR spectra, and heat capacity measurements of PMet have been well interpreted through the normal mode analysis and the density of states derived therefrom. Earlier interpretation of heat capacity data is limited because it is based on the Tarasov model, wherein the concept of group frequency and skeletal similarity are used. A special feature of some dispersion curves is their tendency to bunch in the neighborhood of the helix angle. This has been attributed to the presence of strong intramolecular interactions. Repulsion between the dispersion curves is also observed. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 2281-2292, 1997
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Heat capacity and vibrational dynamics of α poly(β-benzyl-L-aspartate) (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 1213-1228 
    Details
    ISSN: 0887-6266
    Keywords: poly(β-benzyl-L-aspartate) ; conformation ; left-handed ; α helix ; bunching ; crossover ; repulsion ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(β-benzyl-L-aspartate) (PBLA) is an unusual polypeptide, which is capable of going into four different conformations, namely, left-handed α helix, right-handed α helix, ω helix, and β pleated sheet. The present work is a complete study of normal modes and their dispersion in the unusual left-handed α form. A special feature of some of the dispersion curves is their tendency to bunch in the neighborhood of helix angle. This is attributed to the presence of strong intramolecular interactions. Crossing and repulsion between the dispersion curves is also observed. The N-deuterated analogue of PBLA has been studied to check the validity of assignments and force field (Urey Bradley). Specific heat has been obtained from dispersion curves via density of states. A comparative study of left-handed and right-handed forms is presented. © 1996 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Monomere Bis- und Tris(amide) des Indiums (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1060-1064 
    Details
    ISSN: 0044-2313
    Keywords: Tris(2,2,6,6-tetramethylpiperidino)indium; bis(2,2,6,6-tetramethylpiperidino)indium bromide; indium amides; X ray structure analysis ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Monomeric Bis and Tris(amides) of IndiumThe synthesis of tris(2,2,6,6-tetramethylpiperidino)indium 1 and of bis(2,2,6,6-tetramethylpiperidino)indium bromide 2 are described. Both compounds were characterized by NMR and mass spectroscopy. They are monomeric in solution and gasphase. A crystal structure analysis of 1, also described in this work, proofs monomeric 1 in the solid state, too.
    Notes: Die Darstellung von Tris(2,2,6,6-tetramethylpiperidino)indium 1 und von Bis(2,2,6,6-tetramethylpiperidino)-indiumbromid 2 werden beschrieben. Beide Verbindungen wurden NMR und massenspektroskopisch untersucht. Sie liegen in Lösung und Gasphase monomer vor. Die Analyse der Kristallstruktur von 1 belegt dessen monomeres Vorliegen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220621
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  • 4
    Electronic Resource
    Electronic Resource
    Reactions of Titanium Alkoxides with N-Methylaminoalcohols (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 337-346 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030313
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