Kang Jie, Huang Chang-Cang, Zhai Lai-Sheng, Qin Xiao-Huan, Liu Zhong-Qian
Acta Crystallogr Sect E Struct Rep Online. 2009 Mar 11;65(Pt 4):m380-1. doi: 10.1107/S1600536809007764.
In the title compound, Co(C(6)H(6)N(4))(2)(H(2)O)(2), the Co(II) cation and the organic anion occupy different crystallographic inversion centres and, as a consequence, the asymmetric unit comprises two half-mol-ecules. The benzene groups are coplanar. The four coordinating N atoms of the two bidentate biimidazole ligands define the equatorial plane of a slightly distorted octa-hedral CoO(2)N(4) geometry, and the water O atoms lie in the axial coordination sites. Translational (a,) and inversion-related symmetry operations link the Co complex mol-ecules and the negatively charged carboxyl-ate anions via inter-molecular N-H⋯O and O-H⋯O hydrogen bonds into sheets parallel to (01). The coordinated water mol-ecules connect the sheets through O-H⋯O hydrogen bonds, forming a three-dimensional framework. In addition, two intra-molecular O-H⋯O hydrogen bonds are observed between the carboxyl and carboxyl-ate groups.
在标题化合物Co(C₆H₆N₄)₂(H₂O)₂中，Co(II)阳离子和有机阴离子占据不同的晶体学反演中心，因此，不对称单元包含两个半分子。苯环共面。两个双齿联咪唑配体的四个配位N原子定义了略微扭曲的八面体CoO₂N₄几何构型的赤道平面，水O原子位于轴向配位位点。平移(a)和与反演相关的对称操作通过分子间N-H⋯O和O-H⋯O氢键将Co配合物分子和带负电荷的羧酸根阴离子连接成平行于(01)的片层。配位水分子通过O-H⋯O氢键连接这些片层，形成三维框架。此外，在羧基和羧酸根基团之间观察到两个分子内O-H⋯O氢键。
