Long range antiferromagnetic exchange in dinuclear copper(II) complexes containing 1,4-dicyanamidobenzene dianion bridging ligands

Six Cu(II)dimers, [{Cu(dien)} 2 (μ-dicyd)][CF 3 SO 3 ] 2 (1), [{Cu(dien)} 2 (μ-Me 2 dicyd)][CF 3 SO 3 ] 2 (2), [{Cu(dien)} 2 (μ-Cl 2 dicyd)][CF 3 SO 3 ] 2 (3), [{Cu(L)} 2 (μ-dicyd)] (4), [{Cu(L)} 2 (μ-Me 2 dicyd)] (5), and [{Cu(L)} 2 (μ-Cl 2 dicyd)] (6), where dicyd 2− , Me 2 dicyd 2− and Cl 2 dicyd 2− are unsubstituted, 2,5-dimethyl- and 2,5-dichloro-1,4-dicyanamidobenzene dianions, respectively, dien is diethylenetriamine, and L − = …