Photoinduced energy and electron transfer in a giant zinc porphyrin-bridge-C60 system

被引:43
作者
Bell, TDM
Ghiggino, KP [1 ]
Jolliffe, KA
Ranasinghe, MG
Langford, SJ
Shephard, MJ
Paddon-Row, MN
机构
[1] Univ Melbourne, Sch Chem, Melbourne, Vic 3010, Australia
[2] Univ New S Wales, Sch Chem, Sydney, NSW 2052, Australia
关键词
D O I
10.1021/jp014155k
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
Photoinduced electronic energy transfer (EET) and electron transfer (PET) have been investigated in a multichromophoric system 2, that comprises zinc porphyrin (ZnP), dimethoxynaphthalene, and [60]fullerene (C-60) chromophores separated by norbornylogous bridge sections of six and five bond lengths, respectively. In toluene as solvent, EET from ZnP to C-60 occurs in folded and extended conformations of the molecule with rate constants of 1.3 x 10(10) and 8.1 x 10(8) s(-1), respectively. Evidence is presented for the existence of a third collapsed conformation of 2 which can undergo PET with a rate constant of 1.1 X 10(12) s(-1). In benzonitrile solvent, PET can also occur in the folded and extended geometries leading to a charge separated lifetime of 460 ns. The mechanisms for the unusually complex solvent and conformationally dependent excited-state processes in this molecule are discussed.
引用
收藏
页码:10079 / 10088
页数:10
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