Unusual dynamic relaxation of triplet-excited meso-phenyl-substituted porphyrins and their chemical dimers at room temperatures

被引：55

作者：

Knyukshto, V ^{[1
]}

Zenkevich, E ^{[1
]}

Sagun, E ^{[1
]}

Shulga, A ^{[1
]}

Bachilo, S ^{[1
]}

机构：

[1] Byelarussian Acad Sci, Inst Mol & Atom Phys, Minsk 220072, BELARUS

来源：

CHEMICAL PHYSICS LETTERS | 1998年 / 297卷 / 1-2期

关键词：

D O I：

10.1016/S0009-2614(98)01096-3

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：

It has been found that for mono- and di-meso-phenyl-substituted octaethylporphyrin (OEPs), etioporphyrins, corresponding Zn complexes and OEP chemical dimers (with a meso-phenyl spacer) a drastic shortening of triplet lifetimes from a ms to mu s timescale in deaerated toluene solutions at 295 K takes place without any changes of the spectral-kinetic parameters of the S-0 and S-1 states. The observed effects are connected with torsion librations of the phenyl ring around a single C-C bond in sterically encumbered porphyrins leading to non-planar dynamic distorted conformations in excited T-1 states accompanied by an enhancement of the T-1-state nonradiative deactivation pathways. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：97 / 108

页数：12

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