柠檬酸钒(Ⅳ)酰钡热分解制备焦钒酸钡Ba_2[VO(cit)]_2·4H_2O纯相  

Barium Pyrovanadate Prepared from Thermal Decomposition of Barium Dimeric(citrato)oxovanadium(Ⅳ)

作　　者：周朝晖[1] 缪建英[1] 章慧[1] 万惠霖[1] 

机构地区：[1]厦门大学化学系

出　　处：《高等学校化学学报》1999年第8期1168-1171,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金! (批准号 :2 95 0 30 2 1 )资助课题

摘　　要：由柠檬酸钒酰钠与氯化钡的水溶液反应得到柠檬酸钒 ( )酰钡配合物 .通过凝胶扩散法得到该配合物的晶体 ,并用 X射线衍射测定其结构 .该晶体的空间群为 P2 1 n,晶胞参数 a=0 .9896 0 ( 9) nm,b=0 .87746 ( 5) nm,c=1 .2 1 0 75( 8) nm,β=93.1 1 9( 7)°,Z=2 ,R=0 .0 45.该配合物在空气中分解得到白色粉末 ,经 XRD粉末衍射分析确定为焦钒酸钡纯相 .Barium dimeric(citrato)oxovanadium(Ⅳ) tetrahydrates Ba\-2\{\\}\-2·4H\-2O has been prepared by the reaction of sodium dimeric(citrato)oxovanadium(Ⅳ) and barium chloride. Its single crystal was obtained by diffusion method in silica\|gel. The complex crystallizes in monoclinic space group P2\-1/n with unit cell parameters: a =0\^989 60(9) nm, b =0\^877 46(5) nm, c =1\^210 75(8) nm, β =93\^119(7)°, Z =2, R =0\^045 for 1 260 reflections with I≥3σ(I) . Thermal decomposition shows the barium salt undergoes with three major processes, including dehydration, ligand elimination and formation of mixed oxide as its final step, in which the latter is confirmed as pure phase of barium pyrovanadate by XRD analysis.

关 键 词：焦钒酸钡 柠檬酸钒酰钡 钒酸钡 复氧化物 

分 类 号：O614.233[理学—无机化学]