Guo Ming-Lin, Liu Long, Lu Cong-Cong
School of Environment and Chemical Engineering and Key Laboratory of Hollow Fiber Membrane Materials & Membrane Processes, Tianjin Polytechnic University, Tianjin 300160, People's Republic of China.
Acta Crystallogr Sect E Struct Rep Online. 2010 Dec 4;67(Pt 1):m19-20. doi: 10.1107/S1600536810049779.
The unit-cell parameters for the title mixed-metal coordination polymer, {[NiSr(C(3)H(2)O(4))(2)(H(2)O)(5)]·2H(2)O}(n), which is isostructural with its Co-containing analogue, were reported previously [Gil de Muro et al. (1999 ▶). Eur. J. Inorg. Chem. pp. 935-943]; the full crystal structure including a description of the hydrogen bonding is reported here. The Sr(2+) ion is bonded to five O atoms from three different malonate dianions and four water mol-ecules, displaying a distorted tricapped trigonal-prismatic coordination geometry. Two malonate dianions, two water mol-ecules and one Ni(2+) ion build up a dianionic Ni(C(3)H(2)O(4))(2)(H(2)O)(2) unit incorporating a slightly distorted NiO(6) octa-hedron, which coordinates to three nearby Sr(2+) ions. This arrangement creates a metal-organic framework having a 20-membered ring with four Ni and six Sr atoms lying in the bc plane. The coordinated and uncoordinated water mol-ecules are responsible for the formation of two D5 hydrogen-bonded water chains within the 20-membered ring and they are linked into an R4 water cluster via two bifurcated O-H⋯(O,O) links.
标题混合金属配位聚合物{[NiSr(C₃H₂O₄)₂(H₂O)₅]·2H₂O}ₙ的晶胞参数，其与含钴类似物同构，此前已有报道[吉尔·德·穆罗等人（1999年▶）。《欧洲无机化学杂志》第935 - 943页]；此处报道了完整的晶体结构，包括氢键的描述。Sr²⁺离子与来自三个不同丙二酸二阴离子的五个O原子和四个水分子键合，呈现出扭曲的三帽三角棱柱配位几何构型。两个丙二酸二阴离子、两个水分子和一个Ni²⁺离子构成一个二阴离子[Ni(C₃H₂O₄)₂(H₂O)₂]²⁻单元，其中包含一个略有扭曲的NiO₆八面体，该八面体与附近的三个Sr²⁺离子配位。这种排列形成了一个金属有机框架，在bc平面上有一个由四个Ni原子和六个Sr原子组成的20元环。配位和未配位的水分子负责在20元环内形成两条D5氢键水链，它们通过两条分叉的O - H⋯(O,O)键连接成一个R4水簇。
