Time-Resolved Spectroscopy of Photoinduced Molecular Stractural Dynamics

氯丙嗪的光化学：在吩噻嗪、氯吩噻嗪、丙嗪和氯丙嗪的光反应中，阳离子自由基产生一个在560 nm处有吸收峰的瞬态X，而由这个瞬态X产生另一个在380 nm处有吸收峰的瞬态Y。时间分辨红外光谱表明水杨酰苯胺的光反应存在一个寿命为8 μs的瞬态过程。它的结论是基于一个酰胺II带的情况下，瞬态需要一个醌型结构。Luciferein的光化学：它被发现，皮秒时间分辨吸收/荧光光谱的时间依赖性的Luciferein可以被解释在一个4项模型。二苯并氮杂卓光激发态的结构和动力学：用皮秒时间分辨吸收光谱法研究了三个瞬态过程。它们分别处于S_2态、S_1态和弛豫态。我们认为Franck-Condon S_1态是一种类似于基态的蝴蝶状弯曲结构。联苯腈的光化学研究：联苯腈的S_1态结构由中心C-C键周围的扭曲结构转变为与T_1态结构相似的平面结构。咔唑的光化学研究发现：在极性溶剂中，咔唑的光激发导致阳离子自由基和咔唑自由基的形成，而在非极性溶剂中只产生咔唑自由基。阳离子自由基是双光子产生的，而咔唑自由基是双光子产生的。

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.