کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9582568 | 1505210 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Model studies of spectral and photophysical characteristics of donor-acceptor-polyenes: dimethylamino-cyano-diphenylbutadiene
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
4-Dimethylamino-4â²-cyano-1,4-diphenylbutadiene (DCB) and 4-dimethylamino-2,6-dimethyl-4â²-cyano-1,4-diphenylbutadiene (DMDCB) have been photophysically characterized. Quantum chemical calculations were performed for comparison. The fluorescence quantum yields increase with increasing solvent polarity and decreasing temperature. It is concluded that the lowest excited state is a strongly allowed and highly dipolar Ï,Ï* state in polar solvents, and nonradiative deactivation is reduced. This occurs similarly in both compounds. More specifically, the two methyl groups in DMDCB do not enhance the nonradiative decay. This suggests that neither a fluorescent nor a nonfluorescent TICT state is involved in DCB and DMDCB.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics Letters - Volume 401, Issues 1â3, 1 January 2005, Pages 140-148
Journal: Chemical Physics Letters - Volume 401, Issues 1â3, 1 January 2005, Pages 140-148
نویسندگان
Hani El-Gezawy, Wolfgang Rettig, René Lapouyade,