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 |(C10H10N2)| V2IVO2(HPO3)2(H2PO3)21 and |(C4H16N3)| V2IVVIIIO2F2(HPO3)42 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, P21/n, a = 6.3541(14) Å, b = 10.460(2) Å, c = 14.769(3) Å, β = 90.412(5)o, V = 981.6(4) Å3, Z = 2 with R1 = 0.0523), while compound 2 (orthorhombic, Pbca, a = 13.612(3) Å, b = 9.5753(19) Å, c = 14.022(3) Å, V = 1827.6(6) Å3, Z = 4 with R1 = 0.0441) presents a three-dimensional open-framework that consists of a novel {V3O14F2} trimer with mixed valence V2IVVIII linked by two bridging F atoms. In addition, it is worth noting that the organic templates 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.