Hwang In Hong, Kim Pan-Gi, Kim Cheal, Kim Youngmee
Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul 139-743, Republic of Korea.
Acta Crystallogr Sect E Struct Rep Online. 2012 Oct 1;68(Pt 10):m1305-6. doi: 10.1107/S1600536812039761. Epub 2012 Sep 26.
The asymmetric unit of the title compound, [Zn(2)(C(6)H(6)O(7))(2)(H(2)O)(4)]·C(12)H(10)N(2)·2H(2)O, comprises half of a centrosymmetric complex dimer, half of a 1,2-bis-(pyridin-4-yl)ethene mol-ecule, which lies across an inversion centre, and one lattice water mol-ecule. Carboxyl-ate groups of two dianionic citrate ligands bridge two Zn(II) ions to give the cyclic dimer, with each Zn(II) ion coordinated by four O atoms from the chelating citrate ligand (one hy-droxy and three carboxyl-ate, with one bridging) and two water O atoms, forming a distorted octa-hedral environment [Zn-O = 2.040 (3)-2.244 (3) Å]. In the crystal, O-H⋯O and O-H⋯N hydrogen bonds involving hy-droxy groups and both coordinating and lattice water mol-ecules link the dimers to give a three-dimensional framework structure.
标题化合物[Zn₂(C₆H₆O₇)₂(H₂O)₄]·C₁₂H₁₀N₂·2H₂O的不对称单元包括一个中心对称的络合物二聚体的一半、一个位于对称中心上的1,2-双（吡啶-4-基）乙烯分子的一半以及一个晶格水分子。两个二价柠檬酸根配体的羧酸根基团桥连两个Zn(II)离子形成环状二聚体，每个Zn(II)离子由螯合柠檬酸配体的四个O原子（一个羟基和三个羧酸根，其中一个为桥连）以及两个水分子的O原子配位，形成扭曲的八面体环境[Zn - O = 2.040 (3)-2.244 (3) Å]。在晶体中，涉及羟基以及配位水分子和晶格水分子的O - H⋯O和O - H⋯N氢键将二聚体连接起来，形成三维骨架结构。
