Relation between metal environment and antiferromagnetic interactions in binuclear copper complexes, and crystal structures of Cu2Cl2O4N2C20H20, Cu2O8N4C20H20, and Cu2O4N2C28H26

For copper(II) dimers, a correlation between antiferromagnetic interaction and metal environment is demonstrated, and this correlation is strong enough to be used in the solution of three crystal structures.