Electronic relaxations in donor-acceptor biphenyls

被引：12
|
作者：
Maus, M [1 ]
Rettig, W [1 ]
机构：
[1] Humboldt Univ, Inst Phys & Theoret Chem, D-10117 Berlin, Germany
来源：
CHEMICAL PHYSICS LETTERS | 2000年 / 324卷 / 1-3期
关键词：
D O I：
10.1016/S0009-2614(00)00580-7
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Luminescence and excitation anisotropy spectra of donor-acceptor biphenyls in ethanol at 77 K in conjunction with time-resolved emission are analyzed to derive the electronic relaxations in the absence of large structural and solvent relaxations. Short lifetimes and high anisotropy values of the fluorescence bands evidence a L-1(a)/(CT)-C-1 mixed transition being responsible for the fluorescence and first absorption band. For the twisted derivative, 7% of the emission occurs from a L-3(a)-type (CT)-C-3 state. Employing quantum chemical calculations, a polarity-dependent energy level diagram is proposed and the effect of the twist angle on ISC is discussed. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：57 / 63
页数：7
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