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Three one‐dimensional coordination polymers based on 1,1′‐bis(pyridin‐4‐ylmethyl)‐2,2′‐bi‐1 H ‐benzimidazole and Hg X 2 ( X = Cl, Br and I)
Author(s) -
Li AiGuo,
Liu QiKui,
Li YanAn,
Liu ZhiXian,
Dong YuBin
Publication year - 2014
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229613031598
Subject(s) - benzimidazole , crystallography , ligand (biochemistry) , chemistry , molecule , bridging ligand , crystal structure , coordination polymer , stereochemistry , receptor , biochemistry , organic chemistry
A new 2,2′‐bi‐1 H ‐benzimidazole bridging organic ligand, namely 1,1′‐bis(pyridin‐4‐ylmethyl)‐2,2′‐bi‐1 H ‐benzimidazole, C 26 H 20 N 6 , 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‐1 H ‐benzimidazole], [HgCl 2 (C 26 H 20 N 6 )] n , (II), and the bromido, [HgBr 2 (C 26 H 20 N 6 )] n , (III), and iodido, [HgI 2 (C 26 H 20 N 6 )] 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 Hg X 2 ( X = Cl, Br and I), and the Hg II centres are in a distorted tetrahedral [Hg X 2 N 2 ] 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.