高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (8): 1168.

• 论文 • 上一篇    下一篇

柠檬酸钒(Ⅳ)酰钡热分解制备焦钒酸钡Ba2[VO(cit)]2·4H2O纯相

周朝晖, 缪建英, 章慧, 万惠霖   

  1. 厦门大学化学系, 固体表面物理化学国家重点实验室, 厦门 361005
  • 收稿日期:1998-10-19 出版日期:1999-08-24 发布日期:1999-08-24
  • 通讯作者: 周朝晖,男,35岁,副研究员.
  • 作者简介:周朝晖,男,35岁,副研究员.
  • 基金资助:

    国家自然科学基金(批准号:29503021)资助课题

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

ZHOU Zhao-Hui, MIAO Jian-Ying, ZHANG Hui, WAN Hui-Lin   

  1. Department of Chemistry, State Key Laboratory for Physical Chemistry of the Solid Surface, Xiamen University, Xiamen 361005, China
  • Received:1998-10-19 Online:1999-08-24 Published:1999-08-24

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(Ⅳ)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P21/n,晶胞参数a=0.98960(9)nm,b=0.87746(5)nm,c=1.21075(8)nm,β=93.119(7)°,Z=2,R=0.045.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.

关键词: 柠檬酸法, 钒(Ⅳ)酰配合物, 钒酸钡, 晶体结构, 复氧化物

Abstract: Barium dimeric(citrato)oxovanadium(Ⅳ) tetrahydrates Ba2[VO(cit)]2·4H2O 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 crystal-lizes in monoclinic space group P21/n with unit cell parameters: a=0.98960(9) nm, b=0.87746(5) nm, c=1.21075(8) nm, β=93.119(7)°, Z=2, R=0.045 for 1260 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.

Key words: Citrate method, Oxovanadium complexes, Barium vanadate, Crystal Structure, Composite oxide

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