Gao Wei, Zhang Xiu-Mei
College of Chemistry and Materials Science, Huaibei Normal University, 100 Dongshan Road, Huaibei, Anhui 235000, People's Republic of China.
Acta Crystallogr Sect E Struct Rep Online. 2013 Apr 10;69(Pt 5):m252. doi: 10.1107/S1600536813008933. Print 2013 May 1.
In the title polymeric coordination compound, {[Co(C14H10NO4)2(H2O)2]·2H2O} n , the Co(II) ion resides on an inversion center and exhibits a distorted o-cta-hedral coordination geometry defined by four O atoms from two pairs of equivalent monodentate carboxyl-ate groups from 2-[3-(4-carboxyl-atophen-yl)pyridin-1-ium-1-yl]acetate ligands and by two O atoms from two equivalent coordinating water mol-ecules. The zwitterionic di-carboxyl-ate ligands serve as bridges with two monodentate carboxyl-ate and the metal ions are linked by double bridges, forming polymeric chains running along [01-1]. The chains are further stabilized and associated into layers parallel to (011) through intra- and inter-chain hydrogen bonding and π-π stacking inter-actions [inter-planar and centroid-centroid distances of 3.658 (3) Å and 3.653 (2) Å, respectively].
在标题聚合物配位化合物{[Co(C₁₄H₁₀NO₄)₂(H₂O)₂]·2H₂O}ₙ中，Co(II)离子位于一个对称中心上，呈现出一种扭曲的八面体配位几何构型，由来自2-[3-(4-羧基苯)吡啶-1-鎓-1-基]乙酸酯配体的两对等效单齿羧酸根基团的四个O原子以及来自两个等效配位水分子的两个O原子所定义。两性离子二羧酸根基团作为双齿桥连配体，两个单齿羧酸根基团作为桥连基团，金属离子通过双桥连相连，形成沿[01-1]方向延伸的聚合物链。这些链通过链内和链间氢键以及π-π堆积相互作用（平面间距离和质心-质心距离分别为3.658 (3) Å和3.653 (2) Å）进一步稳定并缔合形成平行于(011)的层。
