Spectroscopic Studies of Partially Bound Lewis Acid-Base Complexes

部分结合的路易斯酸碱配合物的光谱研究

基本信息

批准号：
9730844
负责人：
Kenneth Leopold
金额：
$ 29.11万
依托单位：
University of Minnesota-Twin Cities
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-03-01 至 2002-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9730844&HistoricalAwards=false
关键词：
Spectroscopic Studies Partially Bound Lewis

项目摘要

The Experimental Physical Chemistry Program supports Ken Leopold of the University of Minnesota-Twin Cities Campus in his Fourier-transform microwave (FTMW) spectroscopic studies of the structural and electronic properties of Lewis acid-base complexes. In these studies, he will focus on complexes in which the donor-acceptor bond is only partially formed, i.e., a bonding regime intermediate between van der Waals and chemical interactions. In previous work, Prof. Leopold observed that gas phase species which lie in the intermediate regime between van der Waals and chemical bonding undergo enormous changes in structure upon crystallization. In these studies, he will (1) extend this work to a wider number of complexes to investigate the effects of Lewis acidity and basicity on the nature of the donor-acceptor bond, (2) measure dipole moments of partially bonded molecules, and (3) characterize larger clusters containing a partially bonded unit. Partially bonded species are important in a variety of areas of chemistry. One of the most interesting aspects of partially bound systems is their hypersensitivity to a surrounding medium. The phenomenon is most apparent when comparing gas phase species with their crystalline analogues. These studies will provide an experimentally grounded complement for a growing body of theoretical work aimed at further understanding the nature of the electron pair donor-acceptor bond.

实验物理化学计划支持明尼苏达大学 - 双城城市校园的肯·利奥波德（Ken Leopold），他的傅立叶转换微波炉（FTMW）对路易斯酸基碱复合物的结构和电子特性的光谱研究。在这些研究中，他将专注于供体 - 受体键仅部分形成的复合物，即，在范德华和化学相互作用之间介绍了粘合状态。在先前的工作中，利奥波德教授观察到，在范德华和化学键合之间的中间状态的气相物种在结晶后发生了巨大的结构变化。在这些研究中，他将（1）将这项工作扩展到更大数量的复合物，以研究刘易斯酸度和碱性对供体键合键性质的影响，（2）测量部分键合分子的偶极矩，（3）表征包含部分键合单位的较大群集。部分粘结物种在化学领域很重要。部分结合系统最有趣的方面之一是它们对周围介质的过敏性。当将气相物种与晶体类似物进行比较时，这种现象是最明显的。这些研究将为旨在进一步理解电子对供体键的性质的越来越多的理论工作提供实验基础的补充。