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Time-Resolved Spectroscopy of Photoinduced Molecular Stractural Dynamics

光诱导分子结构动力学的时间分辨光谱

基本信息

批准号：
09045038
负责人：
TAKAHASHI Hiroaki
金额：
$ 3.97万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Photochemistry of Chlorpromazine : It was found that in the photoreaction of phenothiazine, chlorophenothiazine, promazine and chlorpromazine a transient X having an absorption peak at 560nm is generated from the cation radical, and from this transient another transient Y with an absorption peak at 380 nm is producedPhotochemistry of Salicylanilide : It was shown by using time-resolved IR spectra that a transient with the lifetime of 8 μs was involved in the photoreaction of salicylanilide. It was concluded based on the absence of an amide II band that the transient takes a quinoid structure.Photochemistry of Luciferein : It was found that the time-dependence of picosecond time-resolved absorption/fluorescence spectra of luciferin can be interpreted in terms of a 4-terms model. This indicates the existence of two isomeric species of S_1.Structure and Dynamics of the Photo-excited States of Dibenzazepine : Three transients were detected by picosecond time-resolved absorption spectroscopy. They were assigned to the S_2 state, S_1 state in the Franck-Condon state, and S_1 state in a relaxed state. The Franck-Condon S_1 state is considered to be in a butterfly-like bent structure similar to the ground state. It was concluded that the relaxed S_1 state is in a planar structure.Photochemistry of Biphenil : It was shown that the structure of binhenyl in the S_1 state changes from a twisted form (around the central C-C bond) to a planar trans form, a structure similar to that of the T_1 state. This structural change in the Sl state occurs within 20 ps after excitationPhotochemistry of Carbazole : It was found that photo-excitation of carbazole gave rise to a formation of the cation radical and carbazyl radical in polar solvents, while only the carbazyl radical was generated in nonpolar solvents. The cation radical is generated biphotonically, while the carbazyl radical is produced monophotonically.

氯丙嗪的光化学:这是吩噻嗪的光化反应,发现chlorophenothiazine,丙嗪和氯丙嗪瞬态X有一个吸收峰在560 nm阳离子自由基产生,并从这短暂的另一个瞬态的吸收峰Y 380海里producedPhotochemistry n -水杨酰苯胺:这是用时间分辨红外光谱表明,短暂的一生8μs参与n -水杨酰苯胺的光反应。由于没有酰胺II带，该化合物的暂态结构为醌类结构。荧光素的光化学：发现荧光素皮秒时间分辨吸收/荧光光谱的时间依赖性可以用四项模型解释。这表明S_1存在两种同分异构体。用皮秒时间分辨吸收光谱法测定了二苯二氮平的三种光激发态的结构和动力学。它们分别处于S_2状态、S_1处于frank - condon状态和S_1处于松弛状态。Franck-Condon S_1态被认为是一个类似基态的蝴蝶状弯曲结构。结果表明，松弛的S_1态属于平面结构。联苯的光化学性质：结果表明，在S_1态下，联苯的结构由围绕中心C-C键的扭曲形式转变为与T_1态相似的平面反式结构。这种Sl态的结构变化发生在激发后20ps内。咔唑的光化学：发现咔唑的光激发在极性溶剂中产生阳离子自由基和咔唑基自由基，而在非极性溶剂中只产生咔唑基自由基。阳离子自由基是生物光子产生的，而咔酰自由基是单光子产生的。