Yaffa Lamine, Pouye Sérigne Fallou, Ndoye Daouda, Diallo Waly, Diop Mayoro, Sidibe Mamadou, Diop Cheikh Abdoul Khadir
Laboratoire de Chimie Minérale et Analytique (LACHIMIA), Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal.
IUCrdata. 2021 Sep 28;6(Pt 9):x210982. doi: 10.1107/S2414314621009822. eCollection 2021 Sep.
The title compound, (NH)[W(CHNO)O]·4HO, was obtained from a mixture of tungstic acid, ammonia and ethyl-enedi-amine-tetra-acetic acid (Hedta) in a 2:4:1 ratio. The anion of the complex contains two WO units and one bridging edta ligand. Each central metal atom is tridentately coordinated by nitro-gen and two carboxyl-ate groups of the edta ligand, together with the three oxido ligands, producing a distorted octa-hedral coordination environment around each tungsten atom. The center of the carbon-carbon bond of the ethyl-ene bridge represents a crystallographic inversion center. The crystal structure consists of a three-dimensional supra-molecular framework built up by the dinuclear cations, the ammonium counter-ions and the solvent water mol-ecules hydrogen bonds of the N-H⋯O and O-H⋯O type.
标题化合物(NH)[W(CHNO)O]·4HO是由钨酸、氨和乙二胺四乙酸（Hedta）按2:4:1的比例混合得到的。该配合物的阴离子包含两个WO单元和一个桥连的edta配体。每个中心金属原子由edta配体的氮原子和两个羧酸根基团以三齿方式配位，再加上三个氧代配体，在每个钨原子周围形成一个扭曲的八面体配位环境。乙烯桥的碳 - 碳键中心代表一个晶体学倒转中心。晶体结构由双核阳离子、铵抗衡离子和溶剂水分子通过N - H⋯O和O - H⋯O型氢键构建而成的三维超分子框架组成。
