Li Ai-Guo, Liu Qi-Kui, Li Yan-An, Liu Zhi-Xian, Dong Yu-Bin
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, People's Republic of China.
Acta Crystallogr C Struct Chem. 2014 Jan;70(Pt 1):37-42. doi: 10.1107/S2053229613031598. Epub 2013 Dec 14.
A new 2,2'-bi-1H-benzimidazole bridging organic ligand, namely 1,1'-bis(pyridin-4-ylmethyl)-2,2'-bi-1H-benzimidazole, C26H20N6, L or (I), has been synthesized and used to create three new one-dimensional coordination polymers, viz. catena-poly[[dichloridomercury(II)]-μ-1,1'-bis(pyridin-4-ylmethyl)-2,2'-bi-1H-benzimidazole], [HgCl2(C26H20N6)]n, (II), and the bromido, [HgBr2(C26H20N6)]n, (III), and iodido, [HgI2(C26H20N6)]n, (IV), analogues. Free ligand L crystallizes with two symmetry-independent half-molecules in the asymmetric unit and each L molecule resides on a crytallographic inversion centre. In structures (II)-(IV), the L ligand is also positioned on a crystallographic inversion centre, whereas the Hg centre resides on a crystallographic twofold axis. Compound (I) adopts an anti conformation in the solid state and forms a two-dimensional network in the crystallographic bc plane via π-π and C-H...π interactions. The three Hg(II) coordination complexes, (II)-(IV), have one-dimensional zigzag chains composed of L and HgX2 (X = Cl, Br and I), and the Hg(II) centres are in a distorted tetrahedral [HgX2N2] coordination geometry. Complexes (III) and (IV) are isomorphous, whereas complex (II) displays an interesting conformational difference from the others, i.e. a twist in the flexible bridging ligand.
一种新型的2,2'-联-1H-苯并咪唑桥联有机配体，即1,1'-双(吡啶-4-基甲基)-2,2'-联-1H-苯并咪唑，C26H20N6，L或(I)，已被合成，并用于制备三种新型的一维配位聚合物，即链状聚[[二氯汞(II)]-μ-1,1'-双(吡啶-4-基甲基)-2,2'-联-1H-苯并咪唑]，[HgCl2(C26H20N6)]n，(II)，以及溴化物[HgBr2(C26H20N6)]n，(III)，和碘化物[HgI2(C26H20N6)]n，(IV)类似物。游离配体L在不对称单元中与两个对称独立的半分子结晶，每个L分子位于一个晶体学反演中心。在结构(II)-(IV)中，L配体也位于一个晶体学反演中心，而Hg中心位于一个晶体学二重轴上。化合物(I)在固态中采用反式构象，并通过π-π和C-H...π相互作用在晶体学bc平面上形成二维网络。三种Hg(II)配位配合物(II)-(IV)具有由L和HgX2(X = Cl、Br和I)组成的一维锯齿链，且Hg(II)中心处于扭曲的四面体[HgX2N2]配位几何构型。配合物(III)和(IV)是同构的，而配合物(II)与其他配合物表现出有趣的构象差异，即在柔性桥联配体中有一个扭曲。
