Different back electron transfer from titanium dioxide nanoparticles to tetra (4-sulfonatophenyl) porphyrin monomer and its J-aggregate

被引：30
|
作者：
Yang, XJ [1 ]
Dai, ZF [1 ]
Miura, A [1 ]
Tamai, N [1 ]
机构：
[1] Kwansei Gakuin Univ, Sch Sci, Dept Chem, Nishinomiya, Hyogo 662, Japan
来源：
CHEMICAL PHYSICS LETTERS | 2001年 / 334卷 / 4-6期
关键词：
D O I：
10.1016/S0009-2614(00)01469-X
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：
The synthesized titanium dioxide (TiO2) nanoparticle was found to enhance the formation of J-aggregate of water-soluble porphyrin, tetra (4-sulfonatophenyl) porphyrin dye, 5,10,15,20-tetraphenyl-21H, 23 H-porphine tetrasulfonic acid (TPPS). The forward and back electron transfers (ETs) between adsorbed TPPS and TiO2 nanoparticles were examined by picosecond single-photon timing and femtosecond transient absorption spectroscopy. The ultrafast back ET of similar to0.8 ps was observed both for the protonated monomer and the J-aggregate. The back ET almost completes within a few tens of picoseconds for the. protonated monomer, while >1 ns is required for the J-aggregate. The difference has been interpreted in terms the hole delocalization and electronic coupling of the protonated monomer and J-aggregate adsorbed on TiO2 nanoparticles. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码：257 / 264
页数：8
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