EVIDENCE OF EXCIPLEX FORMATION IN ACETONITRILE

被引：86

作者：

KIKUCHI, K ^{[1
]}

NIWA, T ^{[1
]}

TAKAHASHI, Y ^{[1
]}

IKEDA, H ^{[1
]}

MIYASHI, T ^{[1
]}

HOSHI, M ^{[1
]}

机构：

[1] KAO CO,HAGA,TOCHIGI 32134,JAPAN

来源：

CHEMICAL PHYSICS LETTERS | 1990年 / 173卷 / 5-6期

关键词：

D O I：

10.1016/0009-2614(90)87227-I

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：

Fluorescence spectra and lifetimes were measured in acetonitrile using anthracenecarbonitriles as the fluorescent material and aromatic compounds as the quencher. Exciplex fluorescence was observed for several systems when their free enthalpy change ΔGf of the actual electron transfer (ET) of the fluorescence quenching is in the range -0.28 to +0.20 eV. It may be concluded for these systems that ET fluorescence quenching is not due to full ET in the encounter state between the fluorescent material and the quencher, but predominantly due to partial ET, i.e. exciplex formation, through which free radicals may also be produced. This means that the ET theory, which assumes a weak electronic exchange interaction between the electron donor and acceptor, is not necessarily available for the theoretical explanation of the free enthalpy dependence of the fluorescence quenching rate in the normal region. © 1990.

引用

页码：421 / 424

页数：4

共 9 条

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