Photoinduced electron transfer from a higher excited state of a porphyrin in a zinc porphyrin-ruthenium(II)tris-bipyridine dyad: Energy transfer in molecular dyads comprising metalloporphyrin and ruthenium(II) tris(2,2'-bipyridyl) terminals. Competition between internal conversion and energy transfer in the upper excited singlet state of the porphyrin

D. LeGourriérec, M. Andersson, J. Davidsson, E. Mukhtar, L. Sun, L. Hammarström, A. Harriman, M. Hissler, O. Trompette, R. Ziessel

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Abstract

The upper S2 excited state of the Zn(porphyrin) unit of the ZnP-(amide)-Ru(bpy)3 dyad undergoes an ultrafast (k = 6 × 1011 s-1) electron transfer to Ru(bpy)32+ which is 60 times faster than from the lowest S1 singlet state. On the other hand, the S2 state of the ZnP-(Pt)-Ru(bpy)3 dyad does not show an electron transfer. Instead, an ultrafast energy transfer occurs from the S2 state of ZnP to the singlet excited state of Ru(bpy)32+, with a rate constant of about 3 ×1011 s-1. The excited-state dynamics of ZnP-(Pt)-Ru(bpy)3 also involves energy transfer from the Si state of ZnP to Ru(bpy)32+ and from the triplet excited state of Ru(bpy)32+ to the lowest triplet state of ZnP.

Original languageEnglish
Pages (from-to)863-869
Number of pages7
JournalChemtracts
Volume12
Issue number12
Publication statusPublished - Nov 1 1999

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ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry
  • Molecular Biology

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