Zuo Minghui, Wang Haiyu, Xu Jie, Zhu Lingling, Cui Shuxin
College of Chemistry and Chemical Engineering, Mu Danjiang Normal University, Mu Danjiang 157012, People's Republic of China.
Acta Crystallogr E Crystallogr Commun. 2015 May 28;71(Pt 6):709-11. doi: 10.1107/S2056989015009706. eCollection 2015 Jun 1.
The polymeric title complex, [Ni2(CN)4(C10H8N2)] n , was obtained serendipitously under hydro-thermal conditions. The asymmetric unit consists of one half of an Ni(CN)4 anion with the Ni(2+) cation situated on an inversion centre, and one half of an Ni(2,2'-bpy) cation (2,2'-bpy is 2,2'-bi-pyridine), with the second Ni(2+) cation situated on a twofold rotation axis. The two Ni(2+) cations exhibit different coordination spheres. Whereas the coordination of the metal in the anion is that of a slightly distorted square defined by four C-bound cyanide ligands, the coordination in the cation is that of a distorted octa-hedron defined by four N-bound cyanide ligands and two N atoms from the chelating 2,2'-bpy ligand. The two different Ni(2+) cations are alternately bridged by the cyanide ligands, resulting in a two-dimensional structure extending parallel to (010). Within the sheets, π-π inter-actions between pyridine rings of neighbouring 2,2'-bpy ligands, with a centroid-to-centroid distance of 3.687 (3) Å, are present. The crystal packing is dominated by van der Waals forces. A weak C-H⋯N inter-action between adjacent sheets is also observed.
聚合物标题配合物[Ni2(CN)4(C10H8N2)]n是在水热条件下意外获得的。不对称单元由一个Ni(CN)4阴离子的一半组成，其中Ni(2+)阳离子位于一个对称中心上，以及一个Ni(2,2'-bpy)阳离子（2,2'-bpy为2,2'-联吡啶）的一半，第二个Ni(2+)阳离子位于一个二次旋转轴上。两个Ni(2+)阳离子表现出不同的配位球。阴离子中金属的配位是由四个与碳相连的氰化物配体定义的略呈扭曲的正方形，而阳离子中的配位是由四个与氮相连的氰化物配体和来自螯合2,2'-bpy配体的两个氮原子定义的扭曲八面体。两个不同的Ni(2+)阳离子通过氰化物配体交替桥连，形成平行于(010)延伸的二维结构。在这些片层内，相邻2,2'-bpy配体的吡啶环之间存在π-π相互作用，质心到质心距离为3.687 (3) Å。晶体堆积以范德华力为主。还观察到相邻片层之间存在弱的C-H⋯N相互作用。
