Synthesis, X-ray structure and magnetic studies of Cu(II) complexes of tridentate SNS ligands (S-dbpt, N,N,N′,N′-tetraisobutylpyridine-2,6-dithiocarboxamide; S-dppt, N,N,N′,N′-tetraisopropylpyridine-2,6-dithiocarboxamide): Role of steric factors o

Two new tetranuclear copper(II) complexes, each formed by a cationic and an anionic dinuclear species are reported. Both of them, characterized by X-ray diffraction, show the same anionic complex [{CuCl2}2(μ-Cl)2]2− which shows weak antiferromagnetic coupling. The dinuclear cationic species [{Cu(S-dbpt)}2(μ-Cl)2]2+ shows ferromagnetic behaviour.