A new lanthanoid-containing arsenotungstate K_(14)H_8[La(H_2O)_3As_2W_(19)O_(67)(H_2O)]_2·53H_2O(1)was hydrothermally synthesized,and was further characterized by IR spectrum,X-ray power diffraction,TG analysis and X-ray single-crystal diffraction.X-ray structural analysis shows that the compound belongs to triclinic system with space group P-1,a = 1.239 5(10)nm,b = 1.847 8(16)nm,c = 2.268 5(19)nm,α= 68.366(12)°,β= 78.215(13)°,γ= 78.406(12)°,Z = 1,Mr= 11 351.63,V = 4.683(7)nm~3,μ= 24.794 mm-1,R1=0.056 4,wR2...