Planar and twisted intramolecular charge transfer states of the excited proton transfer products of aminocoumarins
作者： S.I. Druzhinin , B.D. Bursulaya , B.M. Uzhinov
DOI: 10.1016/1010-6030(95)04055-K
关键词: Fluorescence spectrometry 、 Aminocoumarins 、 Quantum yield 、 Excited state 、 Chemistry 、 Protonation 、 Intramolecular force 、 Photochemistry 、 Proton 、 Cyclohexane
摘要: Abstract The excited state proton transfer (ESPT) reaction of aminocoumarins containing primary ( Ia, If ), secondary Ib, Ic ) and tertiary Id, Ie IIa, IIb 7-amino groups was studied. limiting value the fluorescence quantum yield (φ′ ∞ ESPT product 7- Id , an unfastened amino group, is unusually low in polar solvents (ethanol (EtOH), dimethylsulphoxide (DMSO)) contrast with 7-aminocoumarins Ia-Ic . A decrease solvent polarity results a strong (more than 40-fold cyclohexane) increase φ′ probably due to rate non-fluorescent, cationic, twisted intramolecular charge TICT) formation.
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