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    題名: Effect of Ground-State Twisting on the trans -> cis Photoisomerization and TICT State Formation of Aminostilbenes
    作者: Yang,JS;Lin,CK;Lahoti,AM;Tseng,CK;Liu,YH;Lee,GH;Peng,SM
    貢獻者: 中央大學
    關鍵詞: INTRAMOLECULAR CHARGE-TRANSFER;DUAL EXCITED-STATES;MODEL COMPOUNDS;4-DIMETHYLAMINO 4-CYANOSTILBENE;RELAXATION PATHWAYS;INFRARED-ABSORPTION;KERR ELLIPSOMETRY;AB-INITIO;FLUORESCENCE;STILBENES
    日期: 2009
    上傳時間: 2010-06-29 19:45:30 (UTC+8)
    出版者: 化學研究所
    摘要: The synthesis, X-ray crystal structures, and photochemical behavior of a series of methyl- and ethylene-bridge-substituted trans-4-(N-(4-cyanophenyl)amino)stilbenes (3-8) are reported and compared to those of the parent compound 1CN. Aminostilbene 1CN displays dual fluorescence in polar solvents due to planar and twisted intramolecular charge-transfer (PICT and TICT) states. Alkyl substitution on the stilbene group of 1CN significantly perturbs its photochemistry, including fluorescence, trans -> cis photoisomerization, and TICT state formation. The alkyl substituent effect can be dissected into electronic and steric influences, and both are position dependent, which is vinyl alpha-carbon > vinyl beta-carbon > phenyl o-carbon. The main outcome of the alkyl substituent effect is to lower the barrier for the singlet-state photoisomerization. As a result, the quantum yield for photoisomerization is increased, and that for fluorescence is reduced. The corresponding quantum yield for TICT state formation in polar solvents is reduced only when significant ground-state twisting (a steric influence) is present. The alkyl substitution exerts little or no effect on the rate of intersystem crossing.
    關聯: JOURNAL OF PHYSICAL CHEMISTRY A
    顯示於類別:[化學研究所] 期刊論文

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