Hydrothermal synthesis and characterization of two new arsenic-vanadate compounds with the same cluster anion [As8V14O42(H2O)]4-

Two new arsenic-vanadate compounds [CO(C4H13N3)(2)](2)[As8V14O42(H2O)]center dot 3.5H(2)O(1) and (C2N2H9)(2)(C2N2H10)[As8V14O42(H2O)]center dot 2.33H(2)O (2) have been hydrothermally synthesized and characterized by X-ray single crystal diffraction, IR spectra and thermogravimetric analysis. Compound 1 crystallizes in the monoclinic space group P2(1)/c, a=24.649(9)angstrom, b=13.364(5)angstrom, c=22.463(8)angstrom, beta=104.008(5)degrees, V=7180(5)angstrom(3), Z=4, R-1=0.0787, and wR(2)=0.1859. Compoprid 2 crystallizes in rhombohedral system with space group R3c, a=b=c=22.2405(5)angstrom, alpha=beta=gamma=110.4030(10)degrees, V=8163.4(3)angstrom(3), Z=6, R-1=0.0341 and wR(2)=0.0941. The structural analyses show that both compounds have the same discrete cluster anion [As8V14O42(H2O)](4-). Moreover, in 1, the polyanions are connected through van der Waals forces to generate soft channels that are filled by [Co(C4H13N3)(2)](2+) cations and water. In 2, water and organic molecules link cluster anions to create the supramolecular assembly through hydrogen bonding.