Ultrafast Spectroscopic Studies of Polyene Photochemistry

多烯光化学的超快光谱研究

• 批准号: 9415772
• 负责人: Roseanne Sension
• 金额: $ 28.95万
• 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: 1995
• 资助国家: 美国
• 起止时间: 1995-02-15 至 1999-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9415772&HistoricalAwards=false
• 关键词: Ultrafast; Spectroscopic; Studies; Polyene; Photochemistry

In this project in the Physical Chemistry program of the Chemistry Division, Prof. Roseanne J. Sension of the Chemistry Department of the University of Michigan will investigate the redistribution of energy in condensed phase reactions of small polyene molecules, and the influence of solvent parameters on this redistribution. Simple diene and triene species which serve as prototypes of complex bioorganic molecules will be investigated . Specifically, femtosecond absorption spectroscopy will be used to investigate the cis-trans isomerization reactions of 1,3,5-hexatriene, 2,4-hexadiene, 1,3-butadiene, and the electrocyclic ring opening reaction of cyclohexadiene. The detailed mechanism of chemical transformation in fluid environments remains among the most important unresolved problems in chemistry. While much attention has been given to chemical reaction dynamics of isolated molecules in low pressure gas phase systems, the majority of interesting reactions from a biological, environmental,, or engineering perspective, occur in fluid condensed phase environments. The research done in this project will attack some of these problems in order to meet two goals. 1) To develop a detailed understanding of the role that the electronic structure of polyenes plays in their photochemistry, and 2) to develop a detailed understanding of the role that energy redistribution plays in controlling polyene reactions since this is the ultimate factor in most, if not all, chemical reactions, be they in condensed phases or in isolated molecules. The principles deduced from the studies carried out in this research on prototype molecules will have application to general condensed phase reaction dynamics.

在这个项目中的物理化学程序的化学 科，Roseanne J. Sension教授的化学系的 密歇根大学将研究能源的重新分配， 多烯小分子的凝聚相反应及其影响 溶剂参数的变化。 简单二烯和三烯 作为复杂生物有机分子原型的物种， 研究了 具体来说，飞秒吸收光谱将是 用于研究顺反异构化反应 1，3，5-己三烯、2，4-己二烯、1，3-丁二烯和电环 环己二烯的开环反应。 流体环境中化学转化的详细机制 仍然是化学中最重要的未解决的问题之一。 而 人们对单组分的化学反应动力学给予了很大的关注， 分子在低压气相系统中，大多数感兴趣的 从生物学、环境学或工程学的角度来看， 发生在流体冷凝相环境中。 这项研究 项目将解决其中一些问题，以实现两个目标。 1)为了详细了解电子商务的作用 多烯的结构在其光化学中起作用，2）开发一种 详细了解能量再分配在 控制多烯反应因为这是大多数情况下的最终因素， 如果不是全部的话，化学反应，无论是在凝聚相还是在 孤立的分子 从所进行的研究中得出的原则 在这项对原型分子的研究中， 凝聚相反应动力学