Mercury(II) halide adducts of an olefinic double betaine: [{Hg 2L 2X 4·6HgX 2} n] [X = Cl, Br; L = cis-( p-Me 2NC 5H 4N +) 2C 2(COO −) 2

Abstract

Two polymeric mercury(II) halide adducts of an olefinic double betaine, cis-( p-Me 2NC 5H 4N +) 2C 2(COO −) 2 (L), have been prepared and characterized by X-ray crystallography. [{Hg 2L 2Cl 4·6HgCl 2} n ] ( 1) crystallizes in the monoclinic space group C2/ c with Z = 4, and [{Hg 2L 2Br 4·HgBr 2} n ] ( 2) in the triclinic space group P 1 with Z = 1. Complexes 1 and 2 are structurally similar, being composed of centrosymmetric fourteen-membered rings and nearly linear HgX 2 (X = Cl, Br) moieties that are further inter-linked by weak Hg⋯X [Hg⋯Cl = 2.930–3.136(9) Å, Hg⋯Br = 3.057–3.310(6) Å] and Hg⋯O [2.64, 2.75(3) Å] bonds to generate a two-dimensional polymeric network.