Dinuclear copper(II) and mixed-valence copper(II)-copper(I) complexes of 34-membered macrocyclic ligands (H2M1, H2M2) capable of forming endogenous phenolate and pyridazino bridges. X-ray crystal structures of the dinuclear copper(II) complexes [Cu2M1][BF4]2.cntdot.H2O and [Cu2M2][BF4]2.cntdot.CH3OH

The synthesis, spectroscopic, magnetic, and electrochemical properties of a series of dinuclear copper(II) and mixed-valence copper(II)-copper(I) complexes with the 34-membered macrocyclic ligands H 2 M1 and H 2 M2 are described. The complexes are formed by the template condensation of 2,6-diformyl-4-(R)-phenol (2 equiv) (R=CH 3 , M1; R=tBu, M2) with 3,6-bis((aminoethyl)thio)pyridazine (2 equiv) in the presence of copper(II) salt.