Formation of a supramolecular porphyrin-spacer-acceptor ternary complex and intracomplex electron transfer

Joe Otsuki, Masayuki Takatsuki, Motomu Kaneko, Hironari Miwa, Toshio Takido, Manabu Seno, Ken Okamoto, Hiroshi Imahori, Mamoru Fujitsuka, Yasuyuki Araki, Osamu Ito, Shunichi Fukuzumi

研究成果: Article査読

27 被引用数 (Scopus)

抄録

A new ditopic spacer, N-propylisonicotinamidine, has been developed to assemble a ternary supramolecular complex, zinc-tetraphenylporphyrin (ZnTPP)-spacer acceptor (3,4-dinitrobenzoic acid), via an axial coordination of the spacer to ZnTPP and a salt bridge interaction between the spacer and acceptor. Formation of this ternary complex was probed by 1H HMR and UV-vis spectroscopy. The ternary complex is formed with an overall association constant of 1.9 × 108 M-2 in dichloromethane. The fluorescence is nearly completely quenched by the electron acceptor in the ternary complex as confirmed by the steady-state fluorescence measurements. The triplet excited state of ZnTPP is also quenched by the electron acceptor in the ternary complex. The ternary complex is also formed in acetonitrile, where fluorescence quenching is observed with an intracomplex quenching rate constant of 1.9 × 109 s-1. Photoinduced intracomplex electron transfer is invoked as a likely mechanism of the fluorescence quenching and triplet bleaching.

本文言語English
ページ(範囲)379-385
ページ数7
ジャーナルJournal of Physical Chemistry A
107
3
DOI
出版ステータスPublished - 2003 1 23

ASJC Scopus subject areas

  • 物理化学および理論化学

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