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.H2O and (Cu2M2)(BF4)2.CH3OH, which exhibit aremarkable ligand twist

The reaction of 2,6-diformyl-4-(R)-phenol with 3,6-bis(aminoethyl thio)pyridazine in the presence of copper(II) salts with BF4 and ClO4 anions formed dinuclear copper(II) complexes. Structural analyses revealed that the resulting complexesexhibited Cu2N4O2 dinuclear units with phenoxide bridges and imine nitrogen coordination taking a different molecular twist which increased the axial donoraccessibility of pyridazine nitrogens. In addition, magnetic and electrochemical tests showed the strong antiferromagnetic coupling nature and reactivity of the compounds.