Synthesis and structure of a hexa-coordinated vanadium(IV) complex aquaoxo[N-(2-pyridylmethyl)iminodiacetato]vanadium(IV) dihydrate.
Synthesis and structure of a hexa-coordinated vanadium(IV) complex aquaoxo[N-(2-pyridylmethyl)iminodiacetato]vanadium(IV) dihydrate.
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六配位钒(IV)络合物水氧[N-(2-吡啶基甲基)亚氨基二乙酸]二水合钒(IV)的合成和结构。
DOI：
10.1246/bcsj.52.452
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发表时间：
1979
影响因子：
4
通讯作者：
Kazuo Saito
中科院分区：
文献类型：
--
作者：
S. Ooi;M. Nishizawa;Keiji Matsumoto;H. Kuroya;Kazuo Saito
合成了一种新的配合物[N-（2-吡啶甲基）亚氨基二乙酰基]钒（IV）水溶液[VO（pmida）（H2O）]·2 H2O，用X射线衍射法测定了其晶体结构。由水或乙醇水溶液得到的三斜晶体是孪晶的，含有2摩尔晶格水。晶胞包含四个化学式单元，并且在空间群为P\bar1的假设下分析结构。位置和热参数被细化到R=0.115。钒原子具有畸变的八面体配位，偏离赤道平面0.39 A，其由两个顺式羧酸氧、一个水分子和吡啶氮组成。钒氧和叔氮占据轴向位置。吸收光谱表明，该结构在pH 3.0至4.9的水溶液中保持不变。这种几何异构体似乎是在水介质中选择性形成的。
A new complex, aquaoxo[N-(2-pyridylmethyl)iminodiacetato]vanadium(IV) dihydrate [VO(pmida)(H2O)]·2H2O has been synthesized and its crystal structure determined by the X-ray method. The triclinic crystals obtained from water or aqueous ethanol solution are twinned and contain 2 mol of lattice water. The unit cell contains four formula units and the structure was analyzed on the assumption that the space group is P\bar1. The positional and thermal parameters were refined to R=0.115. The vanadium atom has a distorted octahedral coordination and deviates by 0.39 A from the equatorial plane, which is composed of two cis carboxylate oxygens, a water molecule and the pyridine nitrogen. Vanadyl oxygen and tertiary nitrogen occupy the axial sites. Absorption spectra indicated that the structure is maintained in an aqueous solution of pH 3.0 to 4.9. This geometrical isomer seems to be formed selectively in an aqueous medium.