Аннотация
Raman spectra Of L-alanine, L-threonine and taurine amino acids crystals
under high-pressure conditions at room temperature were investigated in
a diamond anvil cell in order to observe the behavior of the torsional
mode of NH3 unit. It was observed for L-threonine and taurine crystals
that increasing pressure produces an increase in the wave number of the
band associated to the torsional vibration of ammonium group, while for
L-alanine crystal a decrease in the wave number is observed. The
anomalous behavior Of L-alanine is explained in terms of the length and
geometry of the hydrogen bonds within the crystalline structure: due to
a short average length the effect of pressure is to deform the hydrogen
bond, while for L-threonine and taurine, pressure approximates the N and
O atoms in the N-H center dot center dot center dot 0 intermolecular
bond. (c) 2007 Elsevier B.V. All rights reserved.
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