Two 2D inorganic–organic hybrid materials constructed from (V2O6)n2n− chains linked through metal–organic units [Cd(ip)]/[Ni(ip)(H2O)]

Two novel inorganic–organic hybrids [Cd(ip)V2O6] (1) and [{Ni(H2O)(ip)}V2O6 ]·H2O (2) {ip = imidazo[4,5-f ][1,10]-phenanthroline} have been prepared and characterized by single crystal X-ray diffraction, IR and TG. Two-dimensional frameworks of the two title compounds are constructed from arrays of (V2O6)n2n− oxovanadate chains covalently linked through metal–organic units, {Cd(ip)} and {Ni(ip)(H2O)}. The {M/V/O/N} layers are composed of corner sharing {VO4} tetrahedra and {MN2O4} octahedra. In compound 1, the cadmium ions are bridged alternately by two μ3-O and two VO4 units, generating alternated four-membered Cd2O2 and eight-membered Cd2V2O4 rings, while the nickel ions of compound 2 are linked simultaneously by VO4 and V3O10 units into twelve-membered Ni2V4O6 ring. The ip groups, bonded to the metal centers in the layers, project outward to occupy regions in between the successive metal oxide layers. Furthermore, the adjacent layers [Cd(ip)V2O6]n in compound 1 are linked with each other by hydrogen bonding to generate an interesting 3D supramolecular framework.