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Abstract
Two new arsenic–vanadate compounds [Co(C4H13N3)2]2[As8V14O42(H2O)] · 3.5H2O (1) and (C2N2H9)2(C2N2H10)[As8V14O42(H2O)] · 2.33H2O (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 P 2(1)/c, a = 24.649(9) Å, b = 13.364(5) Å, c = 22.463(8) Å, β = 104.008(5)°, V = 7180(5) Å3, Z = 4, R 1 = 0.0787, and wR 2 = 0.1859. Compound 2 crystallizes in rhombohedral system with space group R3c, a = b = c = 22.2405(5) Å, α = β = γ = 110.4030(10)°, V = 8163.4(3) Å3, 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.
Acknowledgement
The authors thank the Nature Science Foundation of Liaoning province (20062139) for financial support.
