Two new oxamido-bridged trinuclear complexes [Cu2M] (M = Mn(II), Co(II)): synthesis, structures, and magnetic properties

By using the macrocyclic oxamido-copper complex CuL (H2L = 2,3-dioxo-5,6:13,14-dibenzo-9,10-(O)cyclohexyl-1,4,8,11-tetraazacyclo-tetradeca-7,12-diene) as precursor, two new trinuclear complexes with the formulas [(CuL)2Mn(ClO4)2] (1) and [(CuL)2Co(ClO4)2] (2) have been synthesized and structurally characterized. H-bonds are found between the molecules, which link adjacent trinuclear units together to form a unique one-dimensional structure. The temperature dependence of the magnetic susceptibility for the complexes was analyzed by means of the Hamiltonian \( {\hat{H} } = - 2J{\hat{S}}_{1} {\hat{S}}_{2} , \) leading to J = −14.66 cm−1 and J = −22.9 cm−1 for 1 and 2, respectively.