Phase transition at 204-250 K in the crystals of -alanine: kinetically irreproduceable, or an artefact?

被引：8
|
作者：
Boldyreva, E. V. [1 ,2 ]
Chesalov, Yu. A. [1 ,3 ]
Drebushchak, T. N. [1 ,2 ]
Kolesnik, E. N. [1 ,2 ]
Kovalevskaya, Yu. A. [4 ]
Paukov, I. E. [4 ]
Drebushchak, V. A. [1 ,4 ,5 ]
Kolesov, B. A. [1 ,4 ]
机构：
[1] Novosibirsk State Univ, Mol Design & Ecologically Safe Technol REC 008, Novosibirsk 630090, Russia
[2] Inst Solid State Chem & Mechanochem SB RAS, Novosibirsk, Russia
[3] Boreskov Inst Catalysis SB RAS, Novosibirsk, Russia
[4] Nikolaev Inst Inorgan Chem SB RAS, Novosibirsk, Russia
[5] Inst Geol & Mineral SB RAS, Novosibirsk, Russia
来源：
PHASE TRANSITIONS | 2009年 / 82卷 / 07期
关键词：
phase transition; -alanine; heat capacity; calorimetry; IR-spectroscopy; X-ray diffraction; thermal expansion; solvent inclusions; TEMPERATURE HEAT-CAPACITY; X-RAY-DIFFRACTION; VIBRATIONAL-SPECTRA; INCREASING PRESSURE; ALPHA-POLYMORPH; RAMAN-SPECTRA; DL-CYSTEINE; SERINE; PARACETAMOL; DISTORTIONS;
D O I：
10.1080/01411590903114198
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The crystals and the powder samples of -alanine were studied in the wide temperature range by adiabatic calorimetry, differential scanning calorimetry, IR- and Raman spectroscopy and X-ray diffraction. No phase transitions could be observed. A small anomaly observed at about 256 K in the Cp(T) dependences measured for the samples re-crystallized from water was shown to be due to the presence of a small (about 0.14% of the total sample mass) amount of solvent inclusions. This anomaly was not observed in the solvent-free samples, either powders or single crystals.
引用
收藏
页码：497 / 506
页数：10
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