Solid state NMR spectroscopic investigations of model compounds for imidazole-based proton conductors

Article Abstract:

The temperature dependence and the exact geometry of slow molecular reorientations in imidazolium methyl sulfonate are investigated using modern one-dimensional MAS exchange spectroscopy. It is futher shown that valuable information on the relative orientations of CH and NH dipolar coupling tensors with respect to the chemical shift anisotropy tensors of the respective heteronuclei can be obtained from the MAS exchange data as well as from static (super 13)C and (super 15)N line shapes.

Usage, Methyl groups, Methyl compounds

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Phase biaxiality in nematic liquid crystalline side-chain polymers of various chemical constitutions

Article Abstract:

The deuterium NMR experiments are conducted on different types of liquid crystalline (LC) side-chain polymers as well as on mixtures with low-molar-mass mesogens and the factors that affect the formation of a biaxial nematic phase are investigated. Plotting different parameters for the systems as a function of T/[T.sub.g] has revealed the vital role of the dynamics of the polymer backbone and hence the glass transition.

Polymer liquid crystals, Liquid crystalline polymers, Spectra, X-ray spectroscopy, Structure

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Characterization of ester hydrolysis in terms of microscopic rate constants

Article Abstract:

Hydroxide-catalyzed ester hydrolysis for molecules of coexisting species is characterized in terms of microscopic rate constants, a new, species-specific physicochemical parameter. The rate constants have determined the effects of phenyl, amino, ammonium, imidazole, imidazolium and hydroxyl moieties in the side chain of the ester site.

All Other Basic Organic Chemical Manufacturing, Esters, Salts & Halides NEC, Hydrolysis, Esters

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