Synthesis, structure, and electrochemical properties of [M(N-MeIm)6]2+ (M = Ni, Co, Cu) associated with [HgCl4]2-

Reaction of Hg(NO3)(2) with 4 equivalent KI in water afford K-2[HgI4]. By using K-2[HgI4] as the precursor, three new heterobimetallic compounds [Ni(N-MeIm)(6)][HgI4] (I), [Co(N-MeIm)(6)][HgI4] (II), and [Cu(N-MeIm)(6)][HgI4] (III) have been characterized by elemental analysis, IR spectra, and the singlecrystal X-ray crystallorgraphy analysis. Three complexes are isomorphous and crystallized in monoclinic symmetry space group P2(1)/c. The coordination around each center metal(II) atom is octahedral with six nitrogen atoms of N-MeIm ligand. Each structure contains one tetrahedral [HgI4](2-) as an anion to balance the charge of the molecular. Thermogravimetry analysis indicates these complexes have the similar departure process and cyclic voltammogram exhibits a significant pair of redox peaks.