在激发时I- (H2O) 2-5的电荷转移到溶剂驱动的溶解动力学:激发状态的初始分子动力学模拟
Maciej Kołaski1, Han Myoung Lee, Chaeho Pak
1Department of Chemistry, Center for Superfunctional Materials, Pohang University of Science and Technology, San 31, Hyojadong, Namgu, Pohang 790-784, Korea.
电荷转移到溶剂 (CTTS) 动力学驱动了化的五秒溶解. 电子转移到水集群导致基释放和溶剂重新排列,这对宿主-客人化学有影响.
科学领域:
- 物理化学 物理化学
- 化学动力学 化学动力学
- 计算化学计算化学
背景情况:
- 与溶解相比,溶解现象在理论上仍未得到充分研究.
- 化在大气化学中至关重要,在激发时经历电荷转移到溶剂 (CTTS) 过程.
- CTTS导致分离成化基和电子-水集群.
研究的目的:
- 从理论上研究水合化集群 (I-(H2O) n=2-5) 的 femtosecond 尺度溶解动态.
- 阐明CTTS在解离和随后的溶剂重新排列过程中的作用.
- 为了将模拟结果与实验超快的探头数据进行比较.
主要方法:
- 激发状态 (ES) 开始分子动力学 (AIMD) 模拟.
- 完全活性空间自我一致场 (CASSCF) 电子结构方法.
- 在n=2-5.5的I-(H2O) n集群的建模.
主要成果:
- 在5秒时间尺度上观察到CTTS驱动的溶解动态.
- 对于小集群 (n=2-4),观察到基的简单种群衰变.
- 对于n=5,对由驱动的结构进行重新排列稳定了多余的电子.
- 基在最初的30 fs影响水的方向,然后变得不那么重要.
- 将溶剂重新排列到较低的自由能量结构发生在~100 fs之后.
结论:
- 这项研究成功地证明了在水合酸集群中CTTS驱动的溶解动力学.
- 结果与实验中的超快探头发现很好地一致.
- 了解这些动态可以为主机-客人化学设计离子结合受体的设计提供信息.
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