硒吩电子激发和光解动力学研究  

Study of Electron Excitation and Photodissociation Dynamics of Selenophene

作　　者：伍贤方[1] 魏松林[1] 郑旭明[1] 

机构地区：[1]浙江理工大学理学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2010年第5期860-864,共5页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金资助项目(20573097);浙江省自然科学基金资助项目(R405465)

摘　　要：获得了硒吩在环己烷溶液中的共振拉曼光谱,结果表明,在Franck-Condon区域内,硒吩的激发态结构动力学主要由7个活性振动模组成。不对称C-Se伸缩振动模υ21的出现,表明在S1(21A1)态时硒吩两个C-Se键发生了不同程度键长变化,其中一个C-Se键显著伸长,而另一个C-Se键变化不大。与噻吩光解离动力学比较发现,硒吩的动力学行为与噻吩十分相似,预示硒吩可能在S1(21A1)态时与某个非绝热单重态Sn(1B1)存在锥形交叉,导致硒吩在Franck-Condon区域发生C-Se键断裂而解离。The authors obtain the 252.7 nm resonance raman spectrum of selenophene in cyclohexane solution.The results indicate that the Franck-Condon region short-time photodissociation dynamics of selenophene have multidimensional characters with motion along the 7 vibration modes.The appearance of the nominal C-Se anti-symmetric stretch ＋C-C=C bend mode v21 at 631 cm-1 suggests that selenophene molecule in the S1 state undergoes large bond length changes along the two C-Se bond lengths with one C-S bond becoming much longer while the other becomes somewhat shorter.Compared with thiophene,the dynamic behavior of selenophene is very similar to thiophene.This suggests that a ring opening reaction may occur in or nearby the Franck-Condon region due to a curve crossing between S1 and Sn state.

关 键 词：硒吩 共振拉曼光谱 光解动力学 

分 类 号：O643.12[理学—物理化学]