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

    研究成果: Contribution to journalArticle査読

    7 被引用数 (Scopus)

    抄録

    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 S1 state. It is plausible that the two excited-state conformers are deactivated independently to the ground state with radiative and nonradiative processes, respectively.

    本文言語英語
    ページ(範囲)274-279
    ページ数6
    ジャーナルChemical Physics Letters
    443
    4-6
    DOI
    出版ステータス出版済み - 8 6 2007

    All Science Journal Classification (ASJC) codes

    • 物理学および天文学(全般)
    • 物理化学および理論化学

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