Chain length dependence of high magnetic field effects on lifetimes of radical ion pairs linked by a methylene chain: Interpretation by both spin-lattice and spin-spin relaxations

Yoshihisa Fujiwara, Jun Hamada, Takeshi Aoki, Takashi Shimizu, Yoshifumi Tanimoto, Hiroaki Yonemura, Sunao Yamada, Tomomi Ujiie, Hiroshi Nakamura

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

High magnetic field dependence of lifetimes of methylene-chain-linked radical ion pairs (RIPs) generated by photo-induced electron transfer from zinc(II) porphyrin to viologen has been confirmed in aqueous acetonitrile using a pulse magnet-laser flash photolysis apparatus. In the case of a short methylene chain it was first revealed that the dependence was definitely different from that for a long one, and was characterized by a reversal in the dependence. In addition to a long lifetime independent of the magnetic field, RIP in fields above 7 T exhibited short lifetimes that depended on the field. These results were interpreted not only by spin-lattice (longitudinal) relaxation but also by spin-spin (transverse) relaxation in RIPs.

Original languageEnglish
Pages (from-to)1405-1411
Number of pages7
JournalMolecular Physics
Volume100
Issue number9
DOIs
Publication statusPublished - May 10 2002

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Molecular Biology
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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