Raman spectroscopic study of DL valine under pressure up to 20 GPa

被引:7
作者
Rego, F. S. C. [1 ]
Lima, J. A., Jr. [1 ]
Freire, P. T. C. [1 ]
Melo, F. E. A. [1 ]
Mendes Filho, J. [1 ]
Polian, A. [2 ]
机构
[1] Univ Fed Ceara, Dept Fis, CP 6030, BR-60455760 Fortaleza, Ceara, Brazil
[2] Univ Paris 06, CNRS, Univ Sorbonne, Inst Mineral Phys Mat & Cosmochim,UMR 7590, F-75005 Paris, France
关键词
DL-valine; High-pressure; Phase transition; Conformational changes; Raman scattering; INDUCED PHASE-TRANSITIONS; X-RAY-DIFFRACTION; L-SERINE-III; CRYSTAL-STRUCTURE; SINGLE-CRYSTAL; AMINO-ACIDS; L-CYSTEINE; ALANINE; SCATTERING; SPECTRA;
D O I
10.1016/j.molstruc.2015.12.026
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
DL-valine crystal was studied by Raman spectroscopy under hydrostatic pressure using a diamond anvil cell from ambient pressure up to 19.4 GPa in the spectral range from 40 to 3300 cm(-1). Modifications in the spectra furnished evidence of the occurrence of two structural phase transitions undergone by this racemic amino acid crystal. The classification of the vibrational modes, the behavior of their wavenumber as a function of the pressure and the reversibility of the phase transitions are discussed. (C) 2015 Published by Elsevier B.V.
引用
收藏
页码:220 / 225
页数:6
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