Spectroscopy and Dynamics of Gas Phase Organometallic Species

气相有机金属物质的光谱学和动力学

• 批准号: 9616724
• 负责人: James Weisshaar
• 金额: $ 52.08万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-03-01 至 2000-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9616724&HistoricalAwards=false
• 关键词: Spectroscopy; Dynamics; Gas; Phase; Organometallic

Jim Weisshaar of the University of Wisconsin in Madison is supported by the Experimental Physical Chemistry Program to continue his reactivity studies involving gas phase reactions of bare transition metal atoms (neutral or ionic) with small alkanes or alkenes, under controlled conditions of initial electronic state and collision energy. Rate constants and branching ratios will be measured as a function of temperature. In the case of the metal ion, crossed beams will be exploited to determine the time scale of reaction with 200 ns resolution Ultimately, these measurements will be extended to reactions of ligated metal atoms (MO, MCH3, MCO) and small metal cluster cations. Finally, laser spectroscopy will be used to determine bond dissociation energies, geometry, and the electronic and vibrational structure of simple organometallic radicals such as MCH2, MCH3, and their cations. Saturated hydrocarbon molecules such as methane and ethane are abundant sources of carbon, but they are relatively inert. Their chemical reactivities can be significantly enhanced, however, by catalysts of transition metal atoms. The physical chemistry of this activation process is not well understood and this research is devoted to improving our knowledge of the interactions between metal atoms and hydrocarbon molecules. Results of this research will affect our understanding of solution-phase organo-metallic chemistry, heterogeneous catalysis and surface chemistry. Furthermore, the data obtained in these investigations will be of use in the development of theoretical models and techniques for the calculation of interaction potentials between metals and hydrocarbon molecules.

位于麦迪逊的威斯康星州大学的Jim Weisshaar得到了 实验物理化学计划继续他的反应 过渡金属裸原子气相反应的研究 （中性或离子）与小烷烃或烯烃，在控制下 初始电子态和碰撞能的条件。 率 常数和分支比将被测量为以下函数： 温度 在金属离子的情况下，交叉束将被 用于确定反应时间尺度，分辨率为200 ns 最终，这些测量将扩展到连接的反应。 金属原子（MO、MCH 3、MCO）和小金属簇阳离子。 最后， 激光光谱学将用于确定键离解能， 几何，以及简单的电子和振动结构 有机金属自由基，如MCH2、MCH3和它们的阳离子。 甲烷、乙烷等饱和烃分子含量丰富 碳源，但它们相对惰性。 它们的化学 然而，反应性可以通过以下催化剂显著增强： 过渡金属原子。 这种激活的物理化学过程 这一过程还没有得到很好的理解，这项研究致力于改善 我们对金属原子和碳氢化合物之间相互作用的了解 分子。 这项研究的结果将影响我们对 液相有机金属化学、多相催化和 表面化学 此外，这些数据 研究将有助于理论模型的发展 以及计算相互作用势的技术 金属和烃分子。