Synthesis and structure of cadmium, copper, and nickel pivalate and pentafluorobenzoate complexes with 2-amino-1-methylbenzimidazole

A series of copper(II), nickel(II), and cadmium(II) compounds with pivalate (Piv) or pentafluorobenzoate (Pfb) anions and 2-amino-1-methylbenzimidazole (L) molecules, [Cu2(Piv)4(L)2]·2MeCN (I), [Ni(Piv)2 (L)2][Ni(Piv)2(L)2(MeOH)] (II), and [Cd(Pfb)2(L)2] (III), were obtained. In the case of copper compounds, a binuclear complex with a Chinese lantern structure was formed, while nickel and cadmium salts gave mononuclear complexes. In all synthesized compounds, the 2-amino-1-methylbenzimidazole molecule is a monodentate ligand, being coordinated to the metal atom through the benzimidazole nitrogen atom. The compounds were characterized by X-ray diffraction, IR spectroscopy, and CHN analysis.