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

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

Maria Alexiou  1 , Catherine Dendrinou-Samara, Anastasia Karagianni, Subhashis Biswas, Curtis M Zaleski, Jeff Kampf, Derek Yoder, James E Penner-Hahn, Vincent L Pecoraro, Dimitris P Kessissoglou
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Models for the lower S states of photosystem II: a trinuclear mixed-valent MnII/MnIV/MnII complex

Maria Alexiou et al. Inorg Chem. .

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.

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