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

Abstract

Three new 3-D inorganic–organic polyoxovanadate-based coordination polymers [M 2(bbi)(V 2O 6) 2(H 2O) 2] [M = Co ( 1), Mn ( 2)] and [Ni 2(bbi) 3V 4O 12]·4H 2O ( 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 {M 2V 4O 12} [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 [Ni 2O 4N 6] node linked with other eight adjacent nodes through two {V 4O 12} 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 H 2SO 4 aqueous solution have been reported.