Abstract
Three complexes of chromium(III) and histidine were investigated by variable temperature magnetic susceptibility and ESR. Two monomeric stereosoimers of Cr(L-histidine) 2(NO 3) were studied; the trans(imidazole) and trans(carboxylate)isomers exhibited Curie-Weiss behaviour in the 6–300 K temperature region. The magnetic susceptibility of the related binuclear complex, [Cr(L-histidine) 2(OH)] 2, showed ferromagnetic behaviour at low temperature (J/k = +0.15 K) lending strong support to the proposed hydroxo-bridged structure.
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