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1 Polish Journal of Chemistry

1 2002

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Novel Ferromagnetic Coupling Dicopper(II), Antiferromagnetic Dicobalt(II) and Dimanganese(II) Complexes with 3-Nitro-phthalato as Bridging Ligand: Synthesis, Spectrum and Magnetism

Ma S. L., Zhang L. Z., Lu L. L., Tang M. Y.

Polish Journal of Chemistry

2002

Vol. 76 / nr 4

511-517

Novel copper(II), cobalt(II) and manganese(II) binuclear complexes have been synthesized, namely [Cu2(3-NO2-phth)(phen)4](ClO4)2 and [M2(3-NO2-phth)(phen)4(H2O)2](ClO4)2, whereM=Co orMn, phen = 1,10-phenanthroline and 3-NO2-phth denotes 3-nitro-phthalate dianion. Magnetic susceptibility measurements between 4.2-300 K (or 77-300 K) demonstrate a ferromagnetic interaction between two copper(II) ions in the Cu-Cu complex, and a weak antiferromagnetic interaction between the metal ions in Co-Co and Mn-Mn complexes. Based on spin Hamiltonian operator, _H = -2J _ S1_ _ S2 (S1=S2 = 1/2, S1=S2 = 3/2 or S1 = S2 = 5/2), J is found to be equal to +5.26 cm-1, -1.72 cm-1 and -0.62 cm-1 for the Cu-Cu, Co-Co and Mn-Mn complexes, respectively