Low-temperature phase transition in glycine-glutaric acid co-crystals studied by single-crystal X-ray diffraction, Raman spectroscopy and differential scanning calorimetry.
Low-temperature phase transition in glycine-glutaric acid co-crystals studied by single-crystal X-ray diffraction, Raman spectroscopy and differential scanning calorimetry.
复制标题
通过单晶 X 射线衍射、拉曼光谱和差示扫描量热法研究甘氨酸-戊二酸共晶的低温相变。
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发表时间：
2012
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通讯作者：
E. Boldyreva
中科院分区：
文献类型：
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作者：
B. Zakharov;E. Losev;B. Kolesov;V. Drebushchak;E. Boldyreva
用单晶X射线衍射、偏振拉曼光谱和差示扫描量热法等三种方法证实了甘氨酸-谷氨酸共晶在220-230 K发生一级可逆相变。这种相变最有趣的特征是每隔一个谷氨酸分子改变其构象，这一事实导致空间群对称性从P2（1）/c变为P1。氢键基序的拓扑结构几乎保持不变，氢键不会切换到其他原子，尽管氢键长度确实发生了变化，一些键变得不等价。
The occurrence of a first-order reversible phase transition in glycine-glutaric acid co-crystals at 220-230 K has been confirmed by three different techniques - single-crystal X-ray diffraction, polarized Raman spectroscopy and differential scanning calorimetry. The most interesting feature of this phase transition is that every second glutaric acid molecule changes its conformation, and this fact results in the space-group symmetry change from P2(1)/c to P1. The topology of the hydrogen-bonded motifs remains almost the same and hydrogen bonds do not switch to other atoms, although the hydrogen bond lengths do change and some of the bonds become inequivalent.