Synthesis, structure, and solution study of a mercury(II) complex with the ligand [1-(2-Methoxyphenyl)-3-(4-chlorophenyl)]triazene

Abstract

The title ligand, [1-(2-methoxyphenyl)-3-(4-chlorophenyl)]triazene, HL (1), was prepared. In a reaction with Hg(NO 3) 2 it forms the complex [Hg(C 26H 22Cl 2N 6O 2)], [HgL 2] (2). Both compounds were characterized by means of X-ray crystallography, CHN analysis, FT-IR, 1H NMR, and 13C NMR spectroscopy. In the structure of compound 1, two independent fragments are present in the unit cell. They exhibit trans arrangement about the -N=N- double bond. The dihedral angles between two benzene rings in both fragments are 4.36 and 18.79 Å, respectively. Non-classic C-H⋯N hydrogen bonding and C-H⋯π interactions form a layer structure along the crystallographic ab plane [110]. In compound 2, the Hg II atom is hexacoordinated by two tridentate [1-(2-methoxyphenyl)-3-(4-chlorophenyl)] triazenide ligands through a N 2O 2 set. In addition, in the structure of 2, monomeric complexes are connected to each other by C-H⋯π stacking interactions, resulting in a 2D architecture. These C-H⋯π edge-to-face interactions are present with H⋯π distances of 3.156 and 3.027 Å. The results of studies of the stoichiometry and formation of complex 2 in methanol solution were found to support its solid state stoichiometry. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.