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Studies on vibrationally excited triplet states

振动激发三重态的研究

基本信息

批准号：
62470006
负责人：
HIROTA Noboru
金额：
$ 4.42万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62470006/
关键词：
Excited triplet states vibrationally excited states phosphorescence photochemical reactions two color MPI 2色MPI 励起スペクトル MPI 時間分解ESR トンネル効果

项目摘要

The purpose of this project was to investigate the properties of vibrationally excited triplet states in isolated molecules (gas phase) and condensed phases.1. Isolated moleculesWe have constructed an apparatus for studying excited molecules in isolated molecule conditions(gas phase). The apparatus consists of an excimer laser pumped dye-laser as a light source, a vacuum chamber system with a supersonic jet source and a detection system for emission and MPI measurements. We have already obtained well resolved fluorescence spectra of pyrazines and are now trying to obtain phosphorescence excitation spectra. We have also attemped to obtain two color MPI specfra of So-Tl transitions of azabenzenes in collaboration with Prof. K. Kimura's group at IMS and succeeded in obtaining the pyrazine spectrum.2. Condensed phasesThe following studies were made in condensed phases. 1) Temperature dependences of the magnetic and decay properties of Tl states and the properties of the vibrationally excited Tl states. 2) Hydrogen abstraction reactions of the Tl states azaaromatics in durene crystals. 3) Excited triplet states of Ru diimine complexes and their relaxation processes. (4) State dependent reactions of triplet benzil in solution. It was shown that the vibrationally excited states play important roles in determining the triplet properties and the reaction rates in there systems. However, there are numerous points to be clarified by further investigations.

本项目的目的是研究孤立分子(气相)和凝聚相中振动激发的三重态的性质。孤立分子我们建造了一台在孤立分子条件下(气相)研究激发态分子的装置。该装置由准分子激光泵浦的染料激光器作为光源、带有超音速射流源的真空室系统和用于发射和MPI测量的探测系统组成。我们已经获得了分辨率很好的吡嗪类化合物的荧光光谱，现在正在尝试获得磷光激发光谱。我们还与木村教授在IMS的研究小组合作，尝试获得了偶氮苯的SO-TL跃迁的两个彩色MPI谱，并成功地获得了吡嗪光谱。凝聚相以下研究是在凝聚相中进行的。1)TL态的磁特性、衰变特性和振动激发TL态的特性与温度的关系。2)均四甲苯晶体中TL态偶氮芳烃的吸氢反应。3)Ru-二亚胺配合物的激发三重态及其弛豫过程。(4)三重态苯环在溶液中的状态相关反应。结果表明，振动激发态在决定三重态的性质和反应速率方面起着重要作用。然而，还有许多问题需要进一步调查才能澄清。