Zusammenfassung
Semiorganic nonlinear optical single crystal L-glutamic acid
hydrochloride has been studied by Raman spectroscopy under high pressure
conditions. Our results show that this amino acid crystal presents one
structural phase transition at about 2.1 GPa and one molecular
conformational change around 7.5 GPa. If we compare such behavior with
that of the L-glutamic acid crystal in the same range of pressure we
note a great stability for the hydrochloride samples. The chloride ion
plays an important role increasing the number of the hydrogen bonds that
hold the crystal together and thus, contributing to improve the
structural stability of the crystal. (C) 2014 Elsevier B.V. All rights
reserved.
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