Excited-state dynamics of normal and doubly N-confused type hexaphyrin derivatives studied by time-resolved fluorescence measurements

Jang Hyun Ryu, Fuyuki Ito, Toshihiko Nagamura, Kiyohisa Nakamura, Hiroyuki Furuta, Yutaka Shibata, Shigeru Itoh

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The excited-state dynamics of two expanded porphyrin derivatives which have six pyrrole rings of normal and doubly N-confused types was studied by time-resolved fluorescence and transient absorption measurements. We have found that their dynamics is very different due to four substituents in the doubly N-confused hexaphyrin derivative. The bleaching recovery of the free-base doubly N-confused hexaphyrin shows the double exponential function with time constants of τ = 80 ± 10 ps and 47 ± 10 ps. The fluorescence decay curve, on the other hand, shows single-exponential function. To explain such behavior, we propose a model that the recovery process originates from two conformers in the S 1 state. It is plausible that the two excited-state conformers are deactivated independently to the ground state with radiative and nonradiative processes, respectively.

Original languageEnglish
Pages (from-to)274-279
Number of pages6
JournalChemical Physics Letters
Volume443
Issue number4-6
DOIs
Publication statusPublished - Aug 6 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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