Hydrothermal synthesis and characterization of two novel three-dimensional vanadium phosphites: |(C10H10N2)| [V2IVO2(HPO3)2(H2PO3)2] and |(C4H16N3)| [V2IVVIIIO2F2(HPO3)4

Two novel three-dimensional vanadium phosphites vertical bar(C10H10N2)vertical bar [(V2VO2)-V-IV(HPO3)(2)(H2PO3)(2)] 1 and vertical bar(C4H16N3)vertical bar [(V2VO2F2)-V-IV-O-III(HPO3)(4)] 2 have been synthesized hydrothermally in the presence of structure-directing agents. Single-crystal structural analysis reveals that compound 1 has a three-dimensional open-framework with two different types of intersecting channels (monoclinic, P2(1)/n, a = 6.3541(14) angstrom, b = 10.460(2) angstrom, c = 14.769(3) angstrom, beta = 90.412(5)degrees, V = 981.6(4) angstrom(3), Z = 2 with R-1 = 0.0523), while compound 2 (orthorhombic, Pbca, a = 13.612(3) angstrom, b = 9.5753(19) angstrom, c = 14.022(3) angstrom, V = 1827.6(6) angstrom(3), Z = 4 with R-1 = 0.0441) presents a three-dimensional open-framework that consists of a novel {V3O14F2} trimer with mixed valence (V2VIII)-V-Iv linked by two bridging F atoms. In addition, it is worth noting that the organic templates plates play important roles in the formation of both novel structures. Further characterization of the two compounds has been performed, including X-ray powder diffraction, ICP, CHN, IR and TG-DTA analyses. (C) 2008 Elsevier Inc. All rights reserved.