Hydrothermal Synthesis and Characterization of a New Arsenic–Vanadium Compound with a β-[As 8 V 14 O 42 (SO 4 )] 6− anion

A new arsenic vanadium compound (NH 4 ) 2 [N(CH 3 ) 4 ] 4 [β-As 8 V 14 O 42 (SO 4 )] 1 has been synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction, IR spectrum, elemental analysis and thermogravimetic (TG) analysis. Compound 1 crystallizes in monoclinic system with space group P2(1)/c, a = 11.4631(5) Å, b = 11.3539(5) Å, c = 24.6265(10) Å, β = 93.6620(10)°, V = 3198.6(2) Å 3 , Z = 2, R1 = 0.0421 and wR2 = 0.1044. The molecule structural analysis reveals that compound 1 has a β-[As 8 V 14 O 42 (SO 4 )] 6− arsenic–vanadium cluster anion.