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

Kazuyuki Ishii, Yoshiharu Hirose, Nagao Kobayashi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)439-443
Number of pages5
JournalJournal of Porphyrins and Phthalocyanines
Volume3
Issue number6-7
DOIs
Publication statusPublished - 1999

Keywords

  • Phthalocyanine
  • TEMPO

ASJC Scopus subject areas

  • Chemistry(all)

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