A series of copper (II) complexes (CuL2x) with new N-di-methylphenyl-3, 5-Bu2t- salicylaldimines (LxH) were prepared and characterized by IR, UV/vis, 1H NMR, ESR, cyclic voltammetry techniques and chemical oxidation. LxH ligands have been found selectively bind to a CuII, rather than to NiII, CoII, MnII, VOIV, ZnII and CdII. ESR examinations of the CuL2x complexes demonstrate that they exist in magnetically diluted mononuclear or ...