High-pressure Raman spectra of L-histidine hydrochloride monohydrate crystal

被引：8

作者：

De Sousa, G. P. ^{[1
]}

Freire, P. T. C. ^{[1
]}

Lima, J. A., Jr. ^{[1
]}

Mendes Filho, J. ^{[1
]}

Melo, F. E. A. ^{[1
]}

机构：

[1] Univ Fed Ceara, Dept Fis, BR-60455760 Fortaleza, Ceara, Brazil

来源：

VIBRATIONAL SPECTROSCOPY | 2011年 / 57卷 / 01期

关键词：

High pressure; Amino acid; Phase transition; INDUCED PHASE-TRANSITIONS; L-SERINE-III; LATTICE STRAIN; L-ALANINE; NEUTRON-DIFFRACTION; INCREASING PRESSURE; GAMMA-POLYMORPH; DL-SERINE; 100; K; GLYCINE;

D O I：

10.1016/j.vibspec.2011.05.010

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Single-crystals of L-histidine hydrochloride monohydrate, C6H9N3O2 center dot HCl center dot H2O, were studied by Raman spectroscopy as a function of pressure in a diamond anvil cell up to 7.5 GPa at room temperature over the spectral range 3450-30 cm(-1). The effect of changing pressure on the vibrational spectrum is discussed. From the analysis of results we inferred that the crystal undergoes a reversible structural phase transition between 2.7 and 3.1 GPa. This transition is characterized by the splitting of a band related to torsion of CO2-, the disappearance and appearance of modes related with stretching of OH- and deformation of CO2-, as well as with bands of low wavenumber which are assigned as lattice modes, and by the discontinuities of the curves of wavenumber versus pressure. Pressure coefficients for all modes observed in this work are also given. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：102 / 107

页数：6

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