癸胺盐酸盐晶体相变的拉曼光谱研究

RAMAN SPECTROSCOPIC STUDY ON PHASE TRANSITIONS OF DECYLAMMONIUM CHLORIDE

在290—340K温度范围内,考察了标题化合物分子链的C—H和C—C伸缩振动等主要拉曼散射谱带频率和强度随温度的变化。结果表明,癸胺盐酸盐晶体在313K和321K发生两次结构相变。在低于313K时,分子链以完全有序的全反式构象存在;在313K以上时,分子链出现了旁式构象。高于321K时,随着旁式链构象的骤增,分子链的侧向填充有序度明显降低,链的“流动性”明显增强。

Raman spectroscopy was used to study the structural phase transitions of title compound in the temperature range from 290 to 340K. The result showed that decylammonium chloride undergoes two phase transitions at 313K and 321K. The Raman spectra of the crystal at room temperature are indicative of a perfactly ordered phase with hydrocarbon chains in all-trans configurations, there are the gauche rotamers above 313K, and the chains are extensively motional and conformationally disordered above 321K.