Weak Complexes Studied by Fourier Transform Microwave Spectroscopy

傅里叶变换微波光谱研究弱配合物

• 批准号: 9218921
• 负责人: Robert Kuczkowski
• 金额: $ 45.25万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-02-01 至 1997-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218921&HistoricalAwards=false
• 关键词: Weak; Complexes; Studied; Fourier; Transform

In this project the structures of weakly bound molecular complexes are to be investigated by means of high resolution Fourier transform microwave spectroscopy. The project has six components: binary complexes containing 1) sulfur dioxide molecules, 2) water molecules, 3) cyclopropane molecules, and 4) rare gas atoms; 5) complexes formed by three monomer molecules; and 6) high temperature investigations. The complexes will be formed in the supersonic expansion into a vacuum of a high pressure mixture of component gases with a neutral carrier gas. Through this expansion the complexes are also cooled to very low translational and rotational temperatures, about 10 degrees above the absolute zero. The work will provide information on the structures and internal motions (dynamics) of the complexes, as well as on their electronic properties such as the electric dipole moment. The results will provide fundamental information about the nature of weak interaction forces between molecules and on intermolecular potential functions, and will contribute to the data base needed to develop and test models and theories which can guide chemists and biochemists in how compounds can interact and grow into larger clusters. %%% The clusters which will be studied constitute a state of matter that is intermediate between that of the dilute gas and the condensed phase and play a crucial role in condensation and evaporation phenomena. Weak intermolecular forces also play a decisive role in the structure and function of biological systems, in which parts of a biological molecule interact with other parts to give it a structure characteristic of its function. Fundamental investigations on intermolecular forces as conducted in this research will also contribute to the data base on which the theories for the prediction of new biochemical substances can be tested and calibrated.

在该项目中，将通过高分辨率傅里叶变换微波光谱研究弱结合分子复合物的结构。 该项目有六个组成部分：含有1）二氧化硫分子、2）水分子、3）环丙烷分子和4）稀有气体原子的二元复合物； 5) 三个单体分子形成的复合物； 6) 高温研究。 这些复合物将在组分气体与中性载气的高压混合物超音速膨胀到真空中时形成。 通过这种膨胀，复合体也被冷却到非常低的平移和旋转温度，比绝对零温度高约 10 度。 这项工作将提供有关配合物的结构和内部运动（动力学）及其电子特性（例如电偶极矩）的信息。 研究结果将提供有关分子之间弱相互作用力和分子间势函数性质的基本信息，并将有助于开发和测试模型和理论所需的数据库，这些模型和理论可以指导化学家和生物化学家了解化合物如何相互作用并成长为更大的簇。 %%% 将要研究的团簇构成了介于稀气体和凝聚相之间的物质状态，并且在凝聚和蒸发现象中起着至关重要的作用。 弱分子间力在生物系统的结构和功能中也起着决定性作用，其中生物分子的部分与其他部分相互作用，赋予其功能的结构特征。本研究中进行的分子间力的基础研究也将有助于测试和校准新生化物质预测理论的数据库。