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Electronic Absorption, MCD and Fluorescence Studies on Phthalocyaninatosilicon Covalently Linked to One or Two TEMPO Radicals

KAZUYUKI ISHII

Department of Chemistry, Tohoku University, Sendai 980-8578, Japan

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YOSHIHARU HIROSE

Department of Chemistry, Tohoku University, Sendai 980-8578, Japan

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NAGAO KOBAYASHI

Department of Chemistry, Tohoku University, Sendai 980-8578, Japan

Corresponding author: Department of Chemistry, Tohoku University, Sendai 980-8578, Japan.

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https://doi.org/10.1002/(SICI)1099-1409(199908/10)3:6/7<439::AID-JPP153>3.0.CO;2-ZCited by:11 (Source: Crossref)

Abstract

The UV-vis absorption, MCD and fluorescence spectra of phthalocyaninatosilicon (SiPc) covalently linked to one or two TEMPO radicals have been studied in comparison with those of (dihydroxy)SiPc. The electronic absorption and MCD spectra show little change on substitution of TEMPO radicals, indicating that the electronic interaction between excited singlet SiPc (¹SiPc*) and doublet TEMPO (²TEMPO) is very weak or non-existent. In contrast, fluorescence quantum yields decrease markedly with increasing number of TEMPO radicals. This result is interpreted reasonably by assuming that the decay from ¹SiPc* to excited triplet SiPc (³SiPc*) partially becomes a spin-allowed transition owing to the interaction between ³SiPc* and ²TEMPO.

Paper presented at 2nd International Symposium on Phthalocyanines, Edinburgh, September 1998.

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