Effect of the Mn Oxidation State on Single-Molecule-Magnet Properties: Mn(III) vs Mn(IV) in Biologically Inspired DyMn3O4 Cubanes.
Inspired by the ferromagnetic coupling in the cubane model CaMn(IV)3O4 of the oxygen-evolving complex of photosystem II, 3d-4f mixed-metal DyMn3O4 clusters were prepared for investigation of the magnetic properties. For comparison, YMn(IV)3O4 and YMn(IV)2Mn(III)O4 clusters were investigated as well and showed ferromagnetic interactions, like the calcium analogue. DyMn(IV)3O4 displays single-molecule-magnet properties, while the one-electron-reduced species (DyMn(IV)2Mn(III)O4) does not, despite the presence of a Mn(III) center with higher spin and single-ion anisotropy.
Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States.|Department of Chemistry, National Chung Hsing University , 250 Kuo Kuang Road, Taichung 40227, Taiwan.
Po-Heng
PH
Lin
Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States.
Emily Y
EY
Tsui
Department of Chemistry, University of Ottawa , 10 Marie-Curie, Ottawa, Ontario K1N 6N5, Canada.
Fatemah
F
Habib
Department of Chemistry, University of Ottawa , 10 Marie-Curie, Ottawa, Ontario K1N 6N5, Canada.
Muralee
M
Murugesu
Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States.
Theodor
T
Agapie
D004578:Electron Spin Resonance Spectroscopy; D008345:Manganese / Q000737:chemistry*; D010084:Oxidation-Reduction
D008345:Manganese