Effect of peripheral substitution on electron and energy transfer in electrostatically bound zinc-magnesium porphyrin dimers

被引:21
作者
Berg, A
Rachamim, M
Galili, T
Levanon, H
机构
[1] HEBREW UNIV JERUSALEM, DEPT PHYS CHEM, IL-91904 JERUSALEM, ISRAEL
[2] HEBREW UNIV JERUSALEM, FARKAS CTR LIGHT INDUCED PROC, IL-91904 JERUSALEM, ISRAEL
关键词
D O I
10.1021/jp9603290
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
We report on intramolecular electron and/or energy transfer (IET and IEnT), in two photoexcited electrostatically bound dimers: (1) zinc(II) tetrakis(4-sulfonatophenyl)porphyrin and magnesium(II) tetrakis(4-N,N,N-trimethylanilinium)porphyrin, [ZnTSPP-MgTTAP]; and (2) zinc(II) tetrakis(4-N,N,N-trimethylanilinium)porphyrin and magnesium(II) tetrakis(4-sulfonatophenyl)porphyrin, [ZnTTAP-MgTSPP]. The photochemical properties of both dimers, dissolved in dimethylsulfoxide-glycerol (DMSO-Glyc, 140 K), were investigated by continuous wave time-resolved electron paramagnetic resonance (CW-TREPR) spectroscopy. It is demonstrated that by changing the peripheral substitution of the particular metalloporphyrin in the dimer, an IET route, parallel to the singlet IEnT, can be triggered. Thus, singlet IEnT from the Zn to the Mg constituent is the only process in [ZnTSPP-MgTTAP], while IET to produce a charge-separated state, [ZnTTAP(.+)-MgTSPP.-] accompanies the IEnT in [ZnTTAP-MgTSPP].
引用
收藏
页码:8791 / 8795
页数:5
相关论文
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