Zhu Li-Cai
School of Chemistry and Environment, South China Normal University, Guangzhou 510631, People's Republic of China.
Acta Crystallogr Sect E Struct Rep Online. 2011 Dec 1;67(Pt 12):m1681-2. doi: 10.1107/S1600536811045764. Epub 2011 Nov 5.
In the title compound, {[Co(3)Lu(2)(C(5)H(2)N(2)O(4))(6)(H(2)O)(4)]·2H(2)O}(n), the Lu(III) ions are seven-coordinated in a monocapped trigonal prismatic coordination geometry by six O atoms from three imidazole-4,5-dicarboxyl-ate ligands and one water O atom. The Co(II) ions are six-coordinated in a slightly distorted octa-hedral geometry and exhibit two types of coordination environments. One Co(II) ion, located on an inversion center, is coordinated by two water O atoms as well as two O atoms and two N atoms from two imidazole-4,5-dicarboxyl-ate ligands. The other Co(II) ion is bonded to four O atoms and two N atoms from four imidazole-4,5-dicarboxyl-ate ligands. These metal coordination units are connected by bridging imidazole-4,5-dicarboxyl-ate ligands, generating a three-dimensional network. The crystal structure is further stabilized by N-H⋯O, O-H⋯O, and C-H⋯O hydrogen-bonding inter-actions between the water mol-ecules and the imidazole-4,5-dicarboxyl-ate ligands.
在标题化合物{[Co₃Lu₂(C₅H₂N₂O₄)₆(H₂O)₄]·2H₂O}ₙ中，Lu(III)离子通过来自三个咪唑-4,5-二羧酸酯配体的六个O原子和一个水O原子以单帽三角棱柱配位几何构型进行七配位。Co(II)离子以略微扭曲的八面体几何构型进行六配位，并呈现出两种配位环境。一个位于对称中心的Co(II)离子由两个水O原子以及来自两个咪唑-4,5-二羧酸酯配体的两个O原子和两个N原子配位。另一个Co(II)离子与来自四个咪唑-4,5-二羧酸酯配体的四个O原子和两个N原子键合。这些金属配位单元通过桥连的咪唑-4,5-二羧酸酯配体连接，形成三维网络。水分子与咪唑-4,5-二羧酸酯配体之间的N-H⋯O、O-H⋯O和C-H⋯O氢键相互作用进一步稳定了晶体结构。
