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Four binuclear Co(Ⅱ), Ni(Ⅱ) and Cu(Ⅱ) complexes bridged by oxamidate (oxd) group have been synthesized, namely Co2(byp)2(oxd)(ClO4)2 (1), Co2(Me2bpy)2(oxd)(ClO4)2.H2O (2), Ni2(bpy)2(oxd)(ClO4)2.2H2O (3) and Cu2(Me2bpy)2(oxd)(NO3)2 (4). (bpy=2,2’-bipyridyl, Me2-bpy=4,4’-dimethylbipyridyl, oxd=oxamidate) The complexes are characterized by IR, UV spectra, EPR and variable-temperature magnetic susceptibility (4-300 K). The susceptibility data for. complexes 1 and 3 were least-squares fit to the susceptibility equation derived from the spin Hamiltonian H=-2J . S1 . S2. The exchange integral, J, was found to be equal to -3.62 cm-1 in 1 and -1.82 cm-1 in 3. This indicates a weak antiferromagnetic spin exchange interaction between the metal ions.
(Bin) 2 (oxd) (ClO4) 2 (1), Co2 (Me2bpy) 2 (oxd) (ClO4) 2.H2O (2), Ni2 (bpy) 2 (oxd) (ClO4) 2.2H2O (3) and Cu2 (Me2bpy) 2 (oxd) , 2’-bipyridyl, Me2-bpy = 4,4’-dimethylbipyridyl, oxd = oxamidate) The complexes are characterized by IR, UV spectra, EPR and variable-temperature magnetic susceptibility (4-300 K) complexes 1 and 3 were least-squares fit to the susceptibility equation derived from the spin Hamiltonian H = -2J. S1. S2. The exchange integral, J, was found to be equal to -3.62 cm- 1 in 1 and -1.82 cm -1 in 3. This indicates a weak antiferromagnetic spin exchange interaction between the metal ions.