title: Crystal structure of catena-poly[1,3-di-benzyl-benzimidazolium [[chlorido-mercurate(II)]-di-μ-chlorido]].
abstract: The asymmetric unit of the polymeric title compound, {(C21H19N2)[HgCl3]} n , comprises one-half of the cationic mol-ecule, the other half being generated by application of twofold rotation symmetry, one Hg and two Cl atoms. The Hg(II) atom, lying on a twofold rotation axis, exhibits a distorted triangular coordination environment and is surrounded by three Cl atoms with Hg-Cl distances in the range 2.359 (2)-2.4754 (13) Å. Two additional longer distances [Hg⋯Cl = 3.104 (14) Å] lead to the formation of polymeric [HgCl1/1Cl4/2](-) chains extending along [001]. The crystal packing can be described by cationic layers alternating parallel to (-110) with the anionic chains located between the layers. The packing is consolidated by π-π stacking inter-actions between the benzene rings of the central benzimidazole entities, with centroid-to-centroid distances of 3.643 (3) Å.
authors: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, CHEMS, Université Frères Montouri Constantine, 25000, Algeria.
authors: Mehdi
authors: M
authors: Bouchouit
authors: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, CHEMS, Université Frères Montouri Constantine, 25000, Algeria.
authors: Abdelmalek
authors: A
authors: Bouraiou
authors: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, CHEMS, Université Frères Montouri Constantine, 25000, Algeria; Département Sciences de la Matière, Faculté des Sciences Exactes et Sciences de la Nature et de la Vie, Université Oum El Bouaghi, Algeria.
authors: Sofiane
authors: S
authors: Bouacida
authors: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, CHEMS, Université Frères Montouri Constantine, 25000, Algeria.
authors: Hocine
authors: H
authors: Merazig
authors: Laboratoire des Produits Naturels d'Origine Végétale et de Synthèse Organique, PHYSYNOR; Université Frères Montouri Constantine, 25000 Constantine, Algeria.
authors: Ali
authors: A
authors: Belfaitah
authors: Département de Chimie, Université frères Montouri Constantine, 25000 , Algeria.
authors: Mebarek
authors: M
authors: Bahnous
keywords: benzimidazole derivative; crystal structure; tri­chlorido­mercurate