一个旋转光谱学研究微溶解对三乙烯中分子内质子转移的微溶解效应-
Dingding Lv1, Xinlei Chen1, Ningjing Jiang1
1Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Songhu Rd. 2005, 200438 Shanghai, China. wei_fang@fudan.edu.cn.
微溶解会影响三酸乙 (TFAA) 的乙醇形式. 水结合稳定了特定的乙醇配置,与孤立的TFAA形成鲜明对比,量子道化控制了水合集群中的质子转移.
科学领域:
- 物理化学 物理化学
- 分子光谱学 分子光谱学
- 量子化学 是一个量子化学.
背景情况:
- 三乙酸 (TFAA) 存在于两种因醇形式,通过质子转移相互转化.
- 微溶解对TFAA的质子位置和乙醇形式稳定性的作用在很大程度上尚未被探索.
- 了解溶解效应对于预测凝结相中的分子行为至关重要.
研究的目的:
- 研究水微溶解对三乙酸 (TFAA) 的乙醇形式的影响.
- 描述水合TFAA复合物的结构和稳定性 (TFAA-(H2O) n,n=1-3).
- 阐明量子道在这些水合集群内的质子转移中的作用.
主要方法:
- 破碎的脉冲里埃变换微波光谱被用来研究TFAA-(H2O) n复合体 (n=1-3).
- 旋转光谱在2-8 GHz频率范围内进行测量.
- 进行了即时理论计算,以分析质子转移动态.
主要成果:
- 对于TFAA-H2O和TFAA-(H2O) 2发现了两种符合性物质,对于TFAA-(H2O) 3发现了一个符合性物质.
- 在CH3侧的水结合有利于F形式,而在CF3侧的结合有利于H形式.
- 在水合复合物中,enolF形式占主导地位,与仅存在enolH的孤立TFAA形成鲜明对比.
结论:
- 水分子通过特定的结合相互作用显著改变TFAA的醇形式偏好.
- 在水合的TFAA集群中,质子转移主要由在低温下进行量子道化.
- 这项研究揭示了一种通过受控水分来控制分子复合的新机制.
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