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  • 1
    Digitale Medien
    Digitale Medien
    Host-guest chemistry. The structure and proton disorder of the three-component crystal formed by 3(5)-methyl-4-nitropyrazole, (R, R)-(-)-trans-4,5-bis (hydroxydiphenylmethyl)-2,2-dimethyl-1,3-dioxolane and toluene (1996)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 9 (1996), S. 611-618 
    Details
    ISSN: 0894-3230
    Schlagwort(e): Chemistry ; Theoretical, Physical and Computational Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The crystal structure at 200 K of the complex formed by the optically active host (R,R)-(-)-trans-4,5-bis(hydroxydiphenylmethyl)-2,2-dimethyl-1,3-dioxolane (2) and 4-nitro-5-methylpyrazole (1b) and toluene as guests was determined by x-ray analysis. Although only the NH protons corresponding to tautomer 1b were found in the structure, some anomalies in the bond angles involving the nitrogen atoms of the pyrazole ring suggested the presence of about 25% of a structure containing the 3-methyl-4-nitropyrazole tautomer (1a). This hypothesis was confirmed by 13C cross polarization magic angle spinning NMR spectroscopy.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
  • 2
    Digitale Medien
    Digitale Medien
    Surface molecular motion in thin films of poly(styrene-block-methyl methacrylate) diblock copolymer (1995)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 46 (1995), S. 476-482 
    Details
    ISSN: 0323-7648
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Thin films of poly(styrene-block-methyl methacrylate) diblock copolymer [P(St-b-MMA)] with thickness ca. 50 nm were prepared by a dip-coating method. The surface Tg for the P(St-b-MMA) thin film was evaluated on the basis of the temperature-dependent X-ray photoelectron spectroscopic (TDXPS) measurement. The temperature at which the surface composition started to change was defined as the glass transition temperature, Tg, at the surface region. It was revealed that the surface Tg for P(St-b-MMA) was much lower than that for its bulk sample. Also, the depth dependence of Tg for P(St-b-MMA) was investigated on the basis of the combination of TDXPS and the angular-dependent XPS (ADXPS) method. Tg for P(St-b-MMA) decreased with a decrease in distance from the outermost surface. The molecular weight dependence of the surface Tg for P(St-b-MMA) was more pronounced than that in the bulk sample, and that was expressed as a function of M-(0.45±0.02)n.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/actp.1995.010460612
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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