Models for the lower S states of photosystem II: a trinuclear mixed-valent MnII/MnIV/MnII complex

Inorg Chem. 2003 Apr 7;42(7):2185-7. doi: 10.1021/ic026050h.

Abstract

The trinuclear complex Mn(3)(pko)(4)(CH(3)O)(2)(SCN)(2).CH(3)OH, 1, where Hpko is 2,2'-dipyridylketonoxime, is a rare example of a complex simultaneously containing Mn(II) and Mn(IV). X-ray crystallography and XANES spectroscopy clearly distinguish the Mn(II)(2)Mn(IV) valence isomer from the more commonly observed Mn(III)(2)Mn(II) formulation. Fits to variable-temperature magnetic susceptibility data indicate that the Mn(II) and Mn(IV) are ferromagnetically coupled (J = +6.13 cm(-1)) and that 1 has an S = (13)/(2) ground state.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Crystallography, X-Ray
  • Iron / chemistry*
  • Magnetics
  • Manganese / chemistry*
  • Models, Molecular*
  • Molecular Conformation
  • Oxidation-Reduction
  • Oxygen / chemistry
  • Photosynthetic Reaction Center Complex Proteins / chemistry*
  • Photosystem II Protein Complex
  • Spectrum Analysis

Substances

  • Photosynthetic Reaction Center Complex Proteins
  • Photosystem II Protein Complex
  • Manganese
  • Iron
  • Oxygen