The synthesis and characterization of new nickel complexes with unusual coordination modes

Two mononickel complexes, K2[Ni(Hccdp)](CH3OH)·8H2O (1), and [Ni(H2O)6][Ni(H2ccdp)(H2O)2]2·12H2O (2); a dinickel complex, K2[Ni2(ccdp)(acac)(H2O)2]·7H2O (3); and a tetranickel complex, Cs6[Ni4(ccdp)2(μ-η2-η2-CO3)2]·23H2O (4) have been synthesized and fully characterized using different techniques including single crystal X-ray crystallography and electrochemistry. The redox behavior of complexes 1-4 were studied using cyclic voltammetry either in water or DMF solution systems.