Using He droplets for measurements of interconversion enthalpy of conformers in 2-chloroethanol.
Using He droplets for measurements of interconversion enthalpy of conformers in 2-chloroethanol.
复制标题
使用 He 液滴测量 2-氯乙醇中构象异构体的互变焓。
DOI：
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发表时间：
2009
影响因子：
4.4
通讯作者：
A. Vilesov
中科院分区：
文献类型：
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作者：
D. Skvortsov;A. Vilesov
用氦滴捕获温度在300 ~ 600 K的2-氯乙醇分子，得到了包埋分子O-H和C-H拉伸带的红外光谱。分子的反式构象和间扭式构象的能带强度比遵循Arrhenius依赖，给出构象相互转化的焓为1.1 kcal/mol。结果表明，在氦液滴中的分子快速冷却时，气相中处于平衡状态的构象的丰度比保持不变。
2-chloroethanol molecules having temperature from 300 to 600 K have been captured by helium droplets and the infrared spectra of the O-H and C-H stretching bands of the embedded molecules have been obtained. The intensity ratio of the bands due to trans and gauche conformers of the molecules follows the Arrhenius dependence, giving the enthalpy of conformers interconversion of 1.1 kcal/mol. It is concluded that the abundance ratio of the conformers, which are at equilibrium in the gas phase, remains unchanged upon the rapid cooling of the molecules in the helium droplets.