Synthesis and characterization of dinuclear copper(II) complexes, [Cu2([20]-DCHDC)(La)2] (La = N3−, NCS− or S2O32−) with tetraazadiphenol macrocyclic ligand having cyclohexane rings

The dinuclear tetraazadiphenol macrocyclic copper(II) complexes [Cu2([20]-DCHDC)(La)2] (La = N3−, NCS− or S2O32−) are prepared by reacting [Cu2([20]-DCHDC)Cl2]∙H2O with an aqueous solution of NaN3, NaSCN, or Na2S2O3. The stable monoclinic crystals, [Cu2([20]-DCHDC)(N3)2]∙2CH3OH (III) suitable for X-ray crystallography are grown from complex II solution on slow evaporation of solvent methanol.