Waugh结构(NH_4)_6[NiMo_9O_(32)]_6H_2O的合成与表征  

Synthesis and Characterization of Waugh Structural Compound (NH_4)[NiMo_9O_(32)]6H_2O

作　　者：霍国燕[1] 霍国堂[1] 王玉平[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《河北大学学报（自然科学版）》2003年第2期151-157,共7页Journal of Hebei University(Natural Science Edition)

摘　　要：以 (NH4 ) 6Mo7O2 4 ·4H2 O和NiSO4 ·7H2 O为原料合成了 [(NH4 ) 6NiMo9O32 ]6H2 O .利用红外、紫外 -可见、差热 -热重和X射线对该化合物进行了表征 .结果表明该杂多酸盐属于Waugh型 ,稳定性好 ,晶体结构为三方晶系 ,空间群为R32 ,晶胞参数为a =1.5 92 2nm ,c =1.2 4 0 6nm .用循环伏安法对该化合物氧化还原的性质进行研究 ,结果表明随着 pH增加阴极峰电位逐渐阴极化 .该杂多酸盐只有在 pH =4 .4左右的水溶液中才能无限期稳定存在 .NH 4) 6[NiMo 9O 32]6H 2O was synthesized using (NH 4) 6[Mo 7O 24]4H 2O and NiSO 4·7H 2O. It was characterized by Infrared Spectrum, Ultraviolet-visible Spectrum, Differential Thermal Analysis (DTA)-Thermogravimetry (TG) and X-Ray Diffraction (XRD). The results show that the heteropolyacid salt has Waugh structure and good thermostability. They also show that the crystal structure of (NH 4) 6[NiMo 9O 32]6H 2O assign to rhombohedral system with space group R32. The lattice parameters of heteropolyacid salt are a=1.592 2 nm,c=1.240 6 nm. The behaviors of oxidation-reduction of (NH 4) 6[NiMo 9O 32]6H 2O compound were studied by Cyclic Voltammetry (CV). It shows the peak voltages of cyclic voltammetry transfer to negative voltage with scanning rates increasing.

关 键 词：WAUGH结构 循环伏安 镍钼杂多酸盐 

分 类 号：O611.4[理学—无机化学]