Dual fluorescence and fast intramolecular charge transfer with 4-(diisopropylamino) benzonitrile in alkane solvents

被引：98

作者：

Demeter, A

Druzhinin, S

George, M

Haselbach, E

Roulin, JL

Zachariasse, KA ^{[1
]}

机构：

[1] Max Planck Inst Biophys Chem Spektroskopie & Phot, D-37070 Gottingen, Germany

[2] Univ Fribourg, Inst Phys Chem, CH-1700 Fribourg, Switzerland

来源：

CHEMICAL PHYSICS LETTERS | 2000年 / 323卷 / 3-4期

关键词：

D O I：

10.1016/S0009-2614(00)00473-5

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：

Dual fluorescence and fast intramolecular charge transfer (ICT) is observed with 4-(diisopropylamino)benzonitrile (DIABN) in alkane solvents. The rate constant k(a) for the reaction from the locally excited (LE) to the ICT state has a value of 3.4 x 10(11) s(-1) in n-hexane at 25 degrees C, with an activation energy E-a of 6 kT mol(-1). Efficient intersystem crossing with a yield of 0.94 takes place from the ICT state. With 4-(dimethylamino)benzonitrile, in contrast, dual fluorescence is not observed in alkanes. The charge transfer reaction of DIABN is mainly favoured by its small energy gap Delta E(S-1,S-2), in accordance with the PICT model for ICT in aminobenzonitriles. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：351 / 360

页数：10

共 35 条

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