Abstract
Two new dinuclear complexes of formula [M2(dcpz)2(H2O)4] in which M is nickel(II) (1) or cobalt(II) (2) and dcpz is the bridging ligand 1,4-dicarboxylatopyridazine have been synthesized and characterized. The crystal structure for the nickel compound has been solved. Complex 1 crystallizes in the orthorombic system, space group Pbca(61), with FW = 521.7, a = 14.501(3) Å, b = 13.169(3) Å, c = 8.774(2) Å, V = 1675(2) Å3, Z = 4, and R = 0.022. The cobalt compound is isomorphous to 1. The pyridazine ligand acts as a double bridge between the two paramagnetic centers. Magnetic measurements show moderate antiferromagnetic coupling, with J values of −33.6 cm-1 for 1 and −11.5 cm-1 for 2. Magnetostructural correlations have been obtained by extended-Hückel MO calculations, and several electronic or structural factors that influence the coupling were analyzed.
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