Isolation of the first ferromagnetically coupled Mn(iii/iv) complex

Literature Information

Publication Date 2003-03-05
DOI 10.1039/B212684M
Impact Factor 6.222
Authors

T. M. Rajendiran, Martin L. Kirk, Ika A. Setyawati, M. Tyler Caudle, Jeff W. Kampf, Vincent L. Pecoraro


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Abstract

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.

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