Spectroscopic Studies of Partially Bound Lewis Acid-Base Complexes

实验物理化学计划支持肯利奥波德的 明尼苏达大学双城校区傅里叶变换 微波（FTMW）光谱研究的结构和电子 刘易斯酸碱复合物的性质。 在这些研究中，他将重点 在其中供体-受体键仅部分形成的络合物上， 也就是说，介于货车德瓦耳斯和化学键之间的键合状态 交互.在以前的工作中，Leopold教授观察到气相 介于货车德瓦耳斯和 化学键的结构发生了巨大的变化， 晶化 在这些研究中，他将（1）将这项工作扩展到 更广泛的复合物的数量，以研究刘易斯酸度的影响， 碱性对给体-受体键的性质，（2）测量偶极 部分键合分子的矩，和（3）表征较大的 包含部分键合单元的簇。 部分键合的物种在生物化学的各个领域都很重要。 化学. 部分绑定的最有趣的方面之一 系统对周围介质的敏感性。 的 当比较气相物质与它们的 结晶类似物。 这些研究将提供一个实验性的 接地补充越来越多的理论工作，旨在 进一步了解电子对给体-受体的性质 邦德

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.