Three new 3-D inorganic-organic coordination polymers constructed from polyoxovanadate-based heterometallic network and flexible bis(imidazole) ligand: Syntheses, structures and properties

Three new 3-D inorganic-organic polyoxovanadate-based coordination polymers [M-2(bbi)(V2O6)(2)(H2O)(2)] [M = Co (1), Mn (2)] and [Ni-2(bbi)(3)V4O12]center dot 4H(2)O (3) (bbi = 1,1-(1,4-butanediyl)bis(imidazole)) have been synthesized under hydrothermal condition and characterized by elemental analyses, IR spectra, TG and single crystal X-ray diffraction. The 3-D networks of compounds 1 and 2 are constructed from neutral {M2V4O12} [M = Co (1), Mn (2)] layers that are pillared via the coordination of organic ligands bbi to M sites. Compound 3 is a 3-D eight-connected network, in which each binuclear [Ni2O4N6] node linked with other eight adjacent nodes through two {V4O12}(4-) clusters and six bbi ligands. The electrochemical behaviors of 1-3 modified carbon paste electrodes (1-CPE, 2-CPE and 3-CPE) in 1 M H2SO4 aqueous solution have been reported. (C) 2009 Elsevier B.V. All rights reserved.