A new 2,2′-bi-1H-benzimidazole bridging organic ligand, namely 1,1′-bis(pyridin-4-ylmethyl)-2,2′-bi-1H-benzimidazole, C26H20N6,Lor (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 ligandLcrystallizes with two symmetry-independent half-molecules in the asymmetric unit and eachLmolecule resides on a crytallographic inversion centre. In structures (II)–(IV), theLligand is also positioned on a crystallographic inversion centre, whereas the Hg centre resides on a crystallographic twofold axis. Compound (I) adopts ananticonformation in the solid state and forms a two-dimensional network in the crystallographicbcplaneviaπ–π and C—H...π interactions. The three HgIIcoordination complexes, (II)–(IV), have one-dimensional zigzag chains composed ofLand HgX2(X= Cl, Br and I), and the HgIIcentres 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.
Synthesis, Crystal Structure, and Luminescence of Cadmium(II) and Silver(I) Coordination Polymers Based on 1,3-Bis(1,2,4-triazol-1-yl)adamantane