Zhai Bin, Zhang Xiangfei, Xu Maotian
Department of Chemistry, Shangqiu Normal University, Shangqiu 476000, Henan, People's Republic of China.
Acta Crystallogr Sect E Struct Rep Online. 2008 Sep 24;64(Pt 10):m1312-3. doi: 10.1107/S160053680802984X.
In the title silver(I) coordination polymer, {[Ag(2)(C(6)H(5)N(2)O(2))(2)(H(2)O)(2)]·2H(2)O}(n), the [Ag(2)(μ(2)-H(2)O)(H(2)O)] cores are extended by anti-parallel 5-methyl-pyrazine-2-carboxyl-ate (L) ligands, forming a novel double-chain structure. Both Ag(+) cations show a distorted square-pyramidal coordination. Ag1 is bonded to two water molecules, one L N atom, one N atom and one carboxylate O atom from a neighbouring L, whereas Ag2 is surrounded by two L N atoms, two L carboxylate O atoms and one bridging water molecule. O-H⋯O hydrogen-bonding inter-actions involving water clusters and carboxyl-ate O atoms link the mol-ecules into a three-dimensional supra-molecular architecture, which is further consolidated by weak C-H⋯O inter-actions and π-π stacking inter-actions [centroid-centroid distance 3.643 (5) Å].
在标题为银（I）配位聚合物{[Ag₂(C₆H₅N₂O₂)₂(H₂O)₂]·2H₂O}ₙ中，[Ag₂(μ₂-H₂O)(H₂O)]核通过反平行的5-甲基吡嗪-2-羧酸盐（L）配体得以扩展，形成一种新颖的双链结构。两个Ag⁺阳离子均呈现出扭曲的四方锥配位构型。Ag1与两个水分子、一个L的N原子、一个N原子以及来自相邻L的一个羧酸根O原子相连，而Ag2则被两个L的N原子、两个L的羧酸根O原子以及一个桥连水分子所环绕。涉及水簇和羧酸根O原子的O-H⋯O氢键相互作用将分子连接成三维超分子结构，该结构通过弱C-H⋯O相互作用和π-π堆积相互作用[质心-质心距离3.643 (5) Å]进一步巩固。
