A series of water soluble copper (II) complexes of the types [Cu (L) Cl] 1–2, where LH is 2-(2- (1H-benzimidazol-2-yl) ethyliminomethyl) phenol (H (L1)), and 2-(2-(1H-benzimidazol-2-yl)- ethyliminomethyl)-4-methylphenol (H (L2)), and [Cu (L) Cl2] 3–6, where L is (2-pyridin-2-yl- ethyl) pyridin-2-ylmethyleneamine (L3), 2-(1H-benzimidazol-2-yl) ethylpyridin-2-yl- methyleneamine (L4), 2-(1H-benzimidazol-2-yl) ethyl (1H-imidazol-2-ylmethylene) amine ...