Model studies of spectral and photophysical characteristics of donor-acceptor-polyenes: dimethylamino-cyano-diphenylbutadiene

4-Dimethylamino-4′-cyano-1,4-diphenylbutadiene (DCB) and 4-dimethylamino-2,6-dimethyl-4′-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...

Full description

Saved in:
Bibliographic Details
Published inChemical physics letters Vol. 401; no. 1; pp. 140 - 148
Main Authors El-Gezawy, Hani, Rettig, Wolfgang, Lapouyade, René
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2005
Online AccessGet full text

Cover

More Information
Summary:4-Dimethylamino-4′-cyano-1,4-diphenylbutadiene (DCB) and 4-dimethylamino-2,6-dimethyl-4′-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 π,π* 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.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2004.10.154