Exchange Coupling in Transition Metal Polyhydrides

过渡金属多氢化物中的交换偶联

• 批准号: 9411030
• 负责人: D. Michael Heinekey
• 金额: $ 34.75万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-07-01 至 1997-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9411030&HistoricalAwards=false
• 关键词: Exchange; Coupling; Transition; Metal; Polyhydrides

9411030 Heinekey University of Washington Dr. Michael Heinekey, Chemistry Department, University of Washington, is supported by the Inorganic, Bioinorganic, and Organometallic Chemistry Program for the study of the high temperature pairwise proton tunnelling which occurs in polyhydride metal complexes. A series of new dihydride and polyhydride of a variety of metals will be prepared. By altering the metal and ancillary ligands stable dihydrogen, dihydrogen-hydride, and polyhydride complexes which show large hydrogen-hydrogen spin couplings will be obtained. An analysis of the temperature dependency of the couplings which occur in these complexes will reveal whether hydrogen exchange occurs by a quantum mechanical tunnelling mechanism. A significant portion of the study will involve the study of hydrides into which deuterium or tritium has been incorporated. Tritium nmr will be used to characterize the behavior of some of these systems. Hydrogen molecules may be activated by allowing them to interact with metal atoms. This behavior has tremendous utility and used in laboratory and industrial chemistry to increase the ability of hydrogen to undergo many reactions, including virtually all "hydrogenation" reactions. One specific example is the process in which unsaturated fats are converted into saturated ones. In another respect, the interactions between hydrogen and metals has become an important topic with the increased interest in hydrogen as a clean fuel. In this project the fundamental ways in which hydrogen becomes attached to a metal will be investigated and the details of how hydrogen atoms interchange with each other under the influence of a metal will be determined.

9411030海尼基华盛顿大学迈克尔·海尼基博士，化学系，华盛顿大学，是由无机，生物无机和有机化学计划的支持，高温成对质子隧道发生在聚氢化物金属络合物的研究。将制备一系列新的金属二氢化物和多氢化物。通过改变金属和辅助配体，将获得稳定的二氢、二氢-氢化物和多氢化物络合物，其显示出大的氢-氢自旋耦合。在这些配合物中发生的耦合的温度依赖性的分析将揭示氢交换是否通过量子力学隧道机制发生。这项研究的一个重要部分将涉及对氘或氚已被纳入其中的氚的研究。氚核磁共振将被用来表征这些系统的行为。 氢分子可以通过与金属原子相互作用而被激活。这种行为具有巨大的实用性，并在实验室和工业化学中用于增加氢气进行许多反应的能力，包括几乎所有的“氢化”反应。一个具体的例子是不饱和脂肪转化为饱和脂肪的过程。另一方面，随着人们对氢作为清洁燃料的兴趣的增加，氢与金属之间的相互作用已经成为一个重要的课题。在这个项目中，将研究氢与金属结合的基本方式，并确定氢原子在金属的影响下如何相互交换的细节。