Femtosecond UV/mid-IR study of photochromism of the spiropyran 1′,3′-dihydro-1′,3′,3′-trimethyl-6-nitrospiro-[2H-1-benzopyran-2,2′-(2H)-indole] in solution
Femtosecond UV/mid-IR study of photochromism of the spiropyran 1′,3′-dihydro-1′,3′,3′-trimethyl-6-nitrospiro-[2H-1-benzopyran-2,2′-(2H)-indole] in solution
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DOI：
10.1016/s0009-2614(03)00949-7
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发表时间：
2003-07-17
影响因子：
2.8
通讯作者：
Fidder, H
中科院分区：
文献类型：
--
作者：
Holm, AK;Rini, M;Fidder, H
采用130 fs时间分辨率的振动吸收光谱，研究了1',3'-二氢-1',3',3'-三甲基-6-硝基螺[2H-1-苯并吡喃-2,2'-(2H)-吲哚]在两种溶剂中的开环反应。发现内部转化和光化学之间的竞争取决于溶剂。内转化量子产率在过氘乙腈中为0.63，在四氯乙烯中为0.34。根据光谱特征和双指数动力学，得出了在四氯乙烯中形成额外的merocyanine异构体的结论。(C) 2003 Elsevier Science B.V.版权所有
The ring-opening reaction of 1',3'-dihydro-1',3',3'-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2'-(2H)-indole] is investigated in two solvents, by probing the evolution of the vibrational absorption spectrum with 130 fs time-resolution. Competition between internal conversion and photochemistry is found to depend on the solvent. The internal conversion quantum yield is determined to be 0.63 in perdeuterated acetonitrile and 0.34 in tetrachloroethene. Based on spectral features and biexponential kinetics, the formation of an additional merocyanine isomer in tetrachloroethene is concluded. (C) 2003 Elsevier Science B.V. All rights reserved.