Models for the lower S states of photosystem II: a trinuclear mixed-valent MnII/MnIV/MnII complex.
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.
Alexiou
Maria
M
Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece.
Dendrinou-Samara
Catherine
C
Karagianni
Anastasia
A
Biswas
Subhashis
S
Zaleski
Curtis M
CM
Kampf
Jeff
J
Yoder
Derek
D
Penner-Hahn
James E
JE
Pecoraro
Vincent L
VL
Kessissoglou
Dimitris P
DP
D018360:Crystallography, X-Ray; D007501:Iron / Q000737:chemistry*; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry*; D045332:Photosystem II Protein Complex; D013057:Spectrum Analysis
D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D008345:Manganese; D007501:Iron; D010100:Oxygen