Electron spin polarization transfer from excited triplet porphyrins to a nitroxide radical via a spin exchange mechanism

Jun Ichi Fujisawa, Kazuyuki Ishii, Yasunori Ohba, Masamoto Iwaizumi, Seigo Yamauchi

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

CIDEP mechanisms in systems of excited triplet tetraphenylporphyrins (MTPP; M = H2, Mg, Zn, Cd) and TEMPO were studied by time-resolved EPR. It was found that dominant polarizations generated on TEMPO are net emissions for H2TPP and MgTPP and net absorptions for ZnTPP and CdTPP, which are the same as the polarizations of the corresponding triplet (T1) porphyrins. The polarizations were diminished with a spin-lattice relaxation time of TEMPO. A polarized T1 signal of ZnTPP was observed in paraffin solution and was quenched by TEMPO. These facts clearly indicate that these polarizations are due to an electron spin polarization transfer mechanism. This is the first definitive demonstration of ESPT in triplet-doublet systems.

Original languageEnglish
Pages (from-to)17082-17084
Number of pages3
JournalJournal of physical chemistry
Volume99
Issue number47
DOIs
Publication statusPublished - 1995 Jan 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Electron spin polarization transfer from excited triplet porphyrins to a nitroxide radical via a spin exchange mechanism'. Together they form a unique fingerprint.

Cite this