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

Abstract Two novel inorganic–organic hybrids [Cd(ip)V 2 O 6 ] (1) and [{Ni(H 2 O)(ip)}V 2 O 6 ]·H 2 O (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 (V 2 O 6 ) n 2n− oxovanadate chains covalently linked through metal–organic units, {Cd(ip)} and {Ni(ip)(H 2 O)}. The {M/V/O/N} layers are composed of corner sharing {VO 4 } tetrahedra and {MN 2 O 4 } octahedra. In compound 1, the cadmium ions are bridged alternately by two μ 3 -O and two VO 4 units, generating alternated four-membered Cd 2 O 2 and eight-membered Cd 2 V 2 O 4 rings, while the nickel ions of compound 2 are linked simultaneously by VO 4 and V 3 O 10 units into twelve-membered Ni 2 V 4 O 6 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)V 2 O 6 ] n in compound 1 are linked with each other by hydrogen bonding to generate an interesting 3D supramolecular framework.