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在pH=5.5和80℃下,Na_2WO_4.2H_2O,NaAsO_2.6H_2O,Co(NO_3)_2.6H_2O和咪唑的水溶液反应,得到了高产率的夹层型杂多酸盐(C_3H_5N_2)_2Na_8[{Co(H_2O)}_2WO(H_2O)(AsW_9O_(33))_2].33H_2O单晶,用X射线单晶衍射法及元素分析确定了其结构.结果表明:该晶体属四方晶系,空间群P-421m,a=1.7191(10),c=1.6376(13)nm,V=4.840(5)nm3,Z=2,R1=0.0484,wR2=0.0714(I>2σ),杂多阴离子[{Co(H_2O)}_2WO(H_2O)(AsW_9O_(33))2]10-具有C2ν对称性,Co2+的配位数均为5.讨论了(CHN)Na[{Co(HO)}WO(HO)(AsWO)].33HO的形成条件.
The aqueous solutions of Na_2WO_4.2H_2O, NaAsO_2.6H_2O, Co (NO_3) _2.6H_2O and imidazole were reacted at pH = 5.5 and 80 ℃ to obtain high yields of intercalated heteropolyacid salt (C_3H_5N_2) _2Na_8 [{Co (H_2O) )} _2WO (H_2O) (AsW_9O_ (33)) _2] .33H_2O was prepared and characterized by X-ray single crystal diffraction and elemental analysis. The results show that the crystal belongs to tetragonal system with space group P-421m, a = 1.7191 (10), c = 1.6376 (13) nm, V = 4.840 (5) nm3, Z = 2 R1 = 0.0484 and wR2 = 0.0714 (I> 2σ) (H 2 O) (AsW_9O_ (33)) 2] 10] has C2v symmetry and the coordination number of Co2 + is 5. The (CHN) Na [{Co (HO)} WO (HO) (AsWO) is discussed. 33HO formation conditions.