1D and 2D supramolecular assemblies from Hg(II) halide complexes of tris(2-pyridyl)amine: structural and spectroscopic studies

Two Hg(II) halide complexes, [Hg2Cl4(TPA)2] (1) and [HgBr2(TPA)] (2) (TPA=tris(2-pyridyl)amine) have been synthesized. X-ray diffraction analyses reveal that 1 is binuclear, whereas, 2 is mononuclear. The binuclear structure of 1 is unsymmetrical: one Hg(II) atom is octahedrally coordinated, with the other Hg(II) tetrahedrally coordinated. Hg(II) atom in 2 has a distorted tetrahedral coordination environment. The coordination moieties of complexes 1 and 2 are connected to give 2D and 1D structures, respectively, by weak intermolecular interactions, namely, the multiple π–π interactions between the TPA pyridyl rings in complex 1, and the intermolecular Hg(II)⋯Br interactions in complex 2. 1H NMR, IR, and Raman results are discussed with reference to the crystal structures. [Copyright &y& Elsevier]