高等学校化学学报

高等学校化学学报 ›› 1997, Vol. 18 ›› Issue (1): 11.

• 论文 • 上一篇    下一篇

含质子柠檬酸氧钒(V)配合物中间体的合成和晶体结构

周朝晖, 缪建英, 万惠霖   

  1. 厦门大学化学系, 厦门, 361005
  • 收稿日期:1996-01-23 出版日期:1997-01-24 发布日期:1997-01-24
  • 通讯作者: 周朝晖, 男, 32岁, 副研究员.
  • 作者简介:周朝晖, 男, 32岁, 副研究员.
  • 基金资助:

    国家科学技术委员会及国家自然科学基金

Synthesis and Crystal Structure of Protonated Sodium Potassium Dimeric(citrato)dioxovanadium(V)

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

  1. Department of Chemistry, State Key Laboratory for Physical Chemistry of the Solid Surface, Xiamen University, Xiamen, 361005
  • Received:1996-01-23 Online:1997-01-24 Published:1997-01-24

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被引次数

12

摘要： 合成了含质子柠檬酸氧钒(V)配合物中间体NaK3[VO2(Hcit)]2·7H2O,用红外光谱和X射线衍射进行了结构表征.结果表明:晶体属单斜晶系,P21/n空间群.晶胞参数a＝1.1258(2)nm,b＝1.5774(3)nm,c＝1.6559(1)nm,β＝98.568(9)°,V＝2.908(1)nm3,Z＝4,Dc＝1.851g·cm－3,F(000)＝164。μ(CuKα)＝104.7cm-1.晶体结构中的二聚柠檬酸氧钒阴离子具有准对称中心,钒原子间的距离已超出钒-钒原子簇的单键键长.阴离子内含有准对称的V2O2四元环,环外有2个柠檬酸根配体通过连接O(1,11)桥原子和α-羧基上单齿配位的氧原子(O2,O12)形成五元环,柠檬酸以独特的羟基和α-羧基同钒双齿配位

关键词: 柠檬酸, 羟基多羧酸, 氧钒(V)配合物, 固氮酶, 晶体结构

Abstract: The titled complex NaK3 [VO2 (Hcit)]2.7H2O (H4cit=citric acid) has been pre-pared and characterized by X-ray diffraction.It crystallizes in monoclinic space group P21/n with unit cell parameters:a = 1.1258(2) nm, b=1.5774(3) nm, c=1.6559(1) nm, β=98.568 (9)°and Dc = 1.851 g.cm-3, Z=4.Each dimer contains a quasi-centrosymmetric planar four-member V2O2 ring with two exocyclic citrate entities coordinated by the oxygen atoms of the hydroxy- and a-carboxylate ligand, while the other two β-carboxylate groups remain uncomplexed as its deprotonated and protonated citratovanadate(V).

Key words: Citric acid, Hydroxypolycarboxylic acid, Dioxovanadium(V) complex, Nitrogenase, Crystal structure

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