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Acid-Base Properties of Photoexcited Molecules

光激发分子的酸碱性质

基本信息

批准号：
9111768
负责人：
Laren Tolbert
金额：
$ 58.55万
依托单位：
Georgia Tech Research Corporation
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1991
资助国家：
美国
起止时间：
1991-07-01 至 1997-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9111768&HistoricalAwards=false
关键词：
Acid Base Properties Photoexcited Molecules

项目摘要

The phenomenon of enhanced acidity occurring in the excited state of hydroxyarenes will be studied. Through strategic design and directed synthesis, new molecules with specifically designed internal proton acceptors or with greatly enhanced photoacidity have been prepared and will be studied. These substrates will allow the testing of various theories of exited state proton transfer, provide new methods of studies of proton transfer initiated reactions, and yield novel structures unattainable by ground state methods. These studies will involve molecular orbital calculations, organic synthesis of target molecules, time-resolved nanosecond fluorescence and other spectroscopic techniques, and structure analysis. %%% This grant from the Organic Dynamics Program supports the continuing work of Professor Laren M. Tolbert at Georgia Tech University. One of the important properties of organic molecules is their acidity, that is, how readily a proton can be transferred to a substrate. Proton transfers are important in the catalysis of many reactions and this is one of the reasons for the great interest in the acidity of organic molecules. Molecules that are excited by irradiation with ultraviolet light may display enhanced acidity, compared to their acidity in the absence of irradiation. The origin of this effect is not well understood and previous explanations may be in error. In the present study, molecules will be specifically designed to test various theories of proton transfer from molecules that are excited by ultraviolet light irradiation.

在激发态发生的酸性增强现象将研究羟基芳烃。通过战略设计和定向合成，新的分子，内部质子受体或具有大大增强的光酸性已经准备好并将进行研究。这些基质将允许测试激发态质子的各种理论为质子转移的研究提供了新的方法引发的反应，并产生新的结构无法实现的基态方法这些研究将涉及分子轨道计算，目标分子的有机合成，时间分辨纳秒荧光和其他光谱技术，以及结构分析 %%% 有机动力学计划的这笔赠款支持拉伦教授M.格鲁吉亚理工大学的托尔伯特大学有机分子的重要性质之一是它们的酸性，也就是质子转移的容易程度到衬底上。质子转移在催化许多反应，这是一个伟大的原因，对有机分子的酸性感兴趣。的分子由紫外光照射激发的可显示增强的酸性，与没有辐射的酸性相比。这种效应的起源还没有很好地理解，解释可能是错误的。在本研究中，分子将是专门设计来检验各种质子理论的紫外线激发的分子辐照