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Abstract
Three novel Co(II)-Mn(III) oxalato heterobinuclear complexes have been synthesized and characterized, namely K[Co(L)2Mn(ox)3] (L denotes 1, 10-phenanthroline (phen), 2, 2′-bipyridyl (bpy), 4, 4′-dimethyl-2, 2′-bipyridyl (Me2bpy), respectively), where ox stands for the oxalate dianion. Based on IR, elemental analyses, electronic spectra and ESR, these complexes are proposed to have extended oxalato-bridged structures consisting of manganese(III) ions and cobalt(II) ions, in which each manganese(III) and each cobalt(II) ion has a distorted octahedral environment. The temperature dependance of the magnetic susceptibility for K[Co(bpy)2Mn(ox)3] and K[Co(bpy)2Mn(ox)3]·2H2O was measured over the range 77 – 300 K and the observed data were simulated by an equation based on the spin Hamiltonian operator (H = −2JS1·S2), giving the exchange integral J= −0.311 cm−1 or −0.335 cm−1, respectively. This indicates a very weak antiferromagnetic interaction between Co(II) ion and Mn(III) ion.
Referee I: R. U. Kirss
Referee II: K. P. Gable
Notes
Referee I: R. U. Kirss
Referee II: K. P. Gable