Isolation of the first ferromagnetically coupled Mn(III/IV) complex.
Binuclear manganese complexes Mn2(III/IV)(dtsalpn)2DCBI, 1, Mn2(III/III)(dtsalpn)2HDCBI, 2, containing the ligand dicarboxyimidazole (DCBI) have been prepared in order to address the issue of imidazole bridged and ferromagnetically coupled Mn sites in high oxidation states of the OEC in Photosystem II (PS II). Temperature dependent magnetic susceptibility studies of 1 indicates that the interaction between the two Mn(III)/Mn(IV) ions is ferromagnetic (J = +1.4 cm(-1)). Variable temperature EPR spectra of 1 shows that a g = 2 multiline is as an excited state signal corresponding to S = 1/2.
Rajendiran
T M
TM
Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, USA.
Kirk
Martin L
ML
Setyawati
Ika A
IA
Caudle
M Tyler
MT
Kampf
Jeff W
JW
Pecoraro
Vincent L
VL
D001665:Binding Sites; D004578:Electron Spin Resonance Spectroscopy; D005290:Ferric Compounds / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D007093:Imidazoles / Q000737:chemistry / Q000378:metabolism; D008280:Magnetics; D008345:Manganese / Q000737:chemistry* / Q000378:metabolism; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D010084:Oxidation-Reduction; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry / Q000378:metabolism; D045332:Photosystem II Protein Complex; D013052:Spectrometry, X-Ray Emission; D013696:Temperature
D005290:Ferric Compounds; D007093:Imidazoles; D009942:Organometallic Compounds; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D008345:Manganese; C029899:imidazole