Abstract
AbstractThe betaine–sulfamic acid (2:1) crystal complex has been investigated by infrared and Raman experiments in polarized light and by cross‐polarization magic angle spinning 13C NMR. Very short and symmetric hydrogen bonds formed by acidic protons and betaine carboxylate groups (—COO—H—OOC—)+ are characterized by the Raman tensor α′(R) available from Raman symmetric stretching vibrations of the carboxylic groups and by the 13C shielding tensor σ of these groups. The principal components of the both tensors were found as to be strongly related: σii = 93.12 + 0.125α′(R)ii. The sulfamate NH2 group reorientation was characterized by Raman bandshape analysis at different temperatures. The energy of very weak O· · ·H—N—H· · ·O hydrogen bonds between the sulfamate and betaine moieties was characterized in this way. Copyright © 2003 John Wiley & Sons, Ltd.
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