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  • 1
    Electronic Resource
    Electronic Resource
    Variable-temperature high-resolution carbon-13 studies of molecular motion in solid bisphenol-F diglycidyl ether (1992)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 434-439 
    Details
    ISSN: 0749-1581
    Keywords: Magic-angle spinning ; Molecular motion ; Phase changes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Variable-temperature cross-polarization magic-angle spinning solid-state 13C NMR spectra of bisphenol-F diglycidyl ether were obtained in the temperature range 25-67°C. Dynamic phenomena are observed, and the experimental data are in accord with an inhomogeneous distribution of correlation times, perhaps related to a second-order phase change. Single-pulse excitation experiments under comparable conditions confirmed the presence of motional inhomogeneity, characterized by a fraction of mobile molecules within the sample. Differential scanning calorimetric measurements revealed a phase transition at ca. 50 °C.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260300515
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  • 2
    Electronic Resource
    Electronic Resource
    Motional heterogeneity and polymorphism of bisphenol-A diacetate (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 540-547 
    Details
    ISSN: 0749-1581
    Keywords: 13C NMR ; 13C CP MAS ; Motional heterogeneity ; Polymorphism ; Bisphenol-A diacetate ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two polymorphs of bisphenol-A diacetate [2,2-bis(p-acetoxyphenyl)propane] were characterized by solid-state 13C cross-polarization magic-angle spinning NMR, X-ray powder diffraction and differential scanning calorimetic measurements. The structure of one polymorph was determined by single-crystal x-ray diffraction methods, and shown to have two molecules in the asymmetric unit. The two polymorphs show markedly different molecular mobilities, as reflected in variable-temperature solid-state NMR measurements, with one polymorph exhibiting motional heterogeneity in the flipping of the phenylene rings.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260310605
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of molecular motions in a derivative of bisphenol-A diglycidyl ether by variable-temperature high-resolution solid-state carbon-13 NMR (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 80-83 
    Details
    ISSN: 0749-1581
    Keywords: Variable temperature ; Molecular motion ; Magic-angle spinning ; Cross-polarization ; Correlation times ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Variable-temperature solid-state 13C NMR measurements show effects due to molecular motion in spectra of 2,2-bis[p-(2,3-dihydroxypropoxy)phenyl]propane (BADGETOL), which is a derivative of bisphenol-A diglycidyl ether. Features in the spectra indicate that the motions present may not be characterized by a simple exponentially decaying autocorrelation function (single correlation-time process), and a study of the coalescence of doublets due to reorientation between non-equivalent sites strongly suggests that the motions are more properly characterized by a spatially inhomogeneous distribution of single correlation-time processes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260250119
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