Efficient Photocyclization of Dithienylethene Dimer, Trimer, and Tetramer: Quantum Yield and Reaction Dynamics
作者:Teruaki Kaieda、Seiya Kobatake、Hiroshi Miyasaka、Masataka Murakami、Nobuyuki Iwai、Yasushi Nagata、Akira Itaya、Masahiro Irie
DOI:10.1021/ja0115722
日期:2002.3.1
Multi-dithienylethene arrays, in which two, three, or four 1,2-bis(2,4-dimethylthiophen-3-yl)perfluorocyclopentenes are ethynylene-bridged, were synthesized. Upon irradiation with ultraviolet light the hexane solutions of the arrays turned violet-blue and the color disappeared by irradiation with visible light. The quantum yields of photocyclization reactions successively increased from 0.21 to 0.40 by increasing
合成了多 dithienylethene 阵列,其中两个、三个或四个 1,2-双 (2,4-二甲基噻吩-3-基) 全氟环戊烯被乙炔桥接。在用紫外光照射后,阵列的己烷溶液变成紫蓝色,并且在可见光照射下颜色消失。通过将阵列中的二噻吩基乙烯部分的数量从 1 增加到 4,光环化反应的量子产率从 0.21 连续增加到 0.40。皮秒激光光解以及荧光去极化实验证实,阵列中从光化学惰性平行构象异构体到光活性反平行构象异构体的有效激发能量迁移导致高量子产率。