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- W1982502198 abstract "Abstract Disorder and motion in crystals of tetra-n-alkylammonium halides of short chain length alkyl groups, [CH3(CH2) n-1]4NX, where n = 1, 2, 3 and X = Br and I, have been analyzed based on solid state NMR. The solid-mesophase phase transitions involve orientational motion and disorder of the cation as a whole, so that the mesophases must be identified as plastic crystals. Except for the methyl rotation, the conformational motion, i.e., the rotation about single-bonds, is limited to small-angle librations that do not reach other conformational isomers. The analyzed salts show, thus, a plastic-crystal me-sophase without conformational disorder. The information on the disorder and motion, obtained initially by thermal analysis of the transition, agrees well with the more detailed NMR results." @default.
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- W1982502198 date "1992-09-01" @default.
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- W1982502198 title "Mesophases of Alkylammonium Salts II. Disorder and Motion in the Low Homologs: [CH3(CH2) n-1]NX, n = 1, 2, 3 and X = Br and I Analyzed by Solid State 13C NMR" @default.
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- W1982502198 doi "https://doi.org/10.1080/10587259208033434" @default.
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