Pressure-induced phase transitions in L-alanine, revisited

被引:73
作者
Tumanov, N. A. [1 ]
Boldyreva, E. V. [1 ,2 ]
Kolesov, B. A. [1 ,3 ]
Kurnosov, A. V. [1 ,3 ]
Cabrera, R. Quesada [4 ,5 ]
机构
[1] Novosibirsk State Univ, Novosibirsk 90, Russia
[2] RAS, Inst Solid State Chem & Mechanochem SB, Novosibirsk 128, Russia
[3] RAS, Nikolaev Inst Inorgan Chem SB, Novosibirsk 90, Russia
[4] Swiss Norwegian Beamline ESRF, Grenoble, France
[5] UCL, Christopher Ingold Labs, London WC1H 0AJ, England
基金
英国工程与自然科学研究理事会;
关键词
X-RAY-DIFFRACTION; NUCLEIC-ACID COMPONENTS; ALPHA-AMINO-ACIDS; MOLECULAR-STRUCTURE; PROTON-TRANSFER; CRYSTAL; TEMPERATURES; GLYCINE; SOLIDS; TRANSFORMATIONS;
D O I
10.1107/S010876811001983X
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The effect of pressure on L-alanine has been studied by X-ray powder diffraction (up to 12.3 GPa), single-crystal X-ray diffraction, Raman spectroscopy and optical microscopy (up to similar to 6 GPa). No structural phase transitions have been observed. At similar to 2 GPa the cell parameters a and b become accidentally equal to each other, but without a change in space-group symmetry. Neither of two transitions reported by others (to a tetragonal phase at similar to 2 GPa and to a monoclinic phase at similar to 9 GPa) was observed. The changes in cell parameters were continuous up to the highest measured pressures and the cells remained orthorhombic. Some important changes in the intermolecular interactions occur, which also manifest themselves in the Raman spectra. Two new orthorhombic phases could be crystallized from a MeOH/EtOH/H2O pressure-transmitting mixture in the pressure range 0.8-4.7 GPa, but only if the sample was kept at these pressures for at least 1-2 d. The new phases converted back to L-alanine on decompression. Judging from the Raman spectra and cell parameters, the new phases are most probably not L-alanine but its solvates.
引用
收藏
页码:458 / 471
页数:14
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