Dinuclear copper complexes with cyanamide derivatives as bridging ligands

Three mixed-valence copper complexes [{Cu(phen)2}2 (μ-L)](PF6)2 (where phen = 1,10-phenanthroline, L = 1,4-dicyanamidobenzene (dicyd)), 1,4-dicyanamido-2,5-dimethylbenzene (Me2 dicyd) and 1,4-dicyanamido-2,5-dichlorobenzene (Cl2 dicyd), and one dinuclear Cu(II) complex [{Cu(phen)2}2 (μ-apc)](PF6)3 (where apc = monoanion of 4-azo(phenylcyanamido)benzene) have been prepared and characterized by elemental analysis, IR and electronic absorption spectroscopies and cyclic voltammetry. [{Cu(phen)2}2(μ-apc)](PF6)3 · 2CH3COCH3 crystallized in the triclinic system and both five-coordinate Cu(II) ions in the dinuclear unit are linked through a bridging 4-azo(phenylcyanamido)benzene (apc) ligand.