Covalently linked ruthenium(II)-manganese(II) complexes: Distance dependence of quenching and electron transfer

Katja E. Berg, Anh Tran, Mary Katherine Raymond, Malin Abrahamsson, Juliusz Wolny, Sophie Redon, Mikael Andersson, Licheng Sun, Stenbjörn Styring, Leif Hammarström, Hans Toftlund, Björn Åkermark

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Abstract

Continuing our development of artificial models for photosystem II in green plants, a series of compounds have been prepared in which a Ru(bpy)32+ photosensitizer is covalently linked to a manganese(II) electron donor. In addition to a trispicolylamine ligand, two other manganese ligands, dipicolylamine and aminodiacetic acid, have been introduced in order to study ligands that are appropriate for the construction of manganese dimers with open coordination sites for the binding of water. Coordination equilibria of the manganese ions were monitored by EPR. The interactions between the ruthenium and manganese moieties were probed by flash photolysis, cyclic voltammetry and steady-state and time-resolved emission measurements. The quenching of the RuII excited state by MnII was found to be rapid in complexes with short Ru-Mn distances. Nevertheless, each RuII species could be photo-oxidized by bimolecular quenching with methylviologen, and the subsequent electron transfer from MnII to RuIII could be monitored.

Original languageEnglish
Pages (from-to)1019-1029
Number of pages11
JournalEuropean Journal of Inorganic Chemistry
Issue number4
Publication statusPublished - Apr 17 2001

Keywords

  • Electron transfer
  • Manganese
  • N ligands
  • Ruthenium

ASJC Scopus subject areas

  • Inorganic Chemistry

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    Berg, K. E., Tran, A., Raymond, M. K., Abrahamsson, M., Wolny, J., Redon, S., Andersson, M., Sun, L., Styring, S., Hammarström, L., Toftlund, H., & Åkermark, B. (2001). Covalently linked ruthenium(II)-manganese(II) complexes: Distance dependence of quenching and electron transfer. European Journal of Inorganic Chemistry, (4), 1019-1029.