Copper(II) and Lead(II) Complexes Based on 2,3,5,6-tetrakis(2-Pyridyl)Pyrazine as a Polydentate Ligand

Abstract

The Cu(II) complexes [Cu(Tppz)(Dipic)] ⋅ 8H2O (I) and [Pb2(Tppz)Cl4]n (II), where Tppz,<br><br>H2Dipic are 2,3,5,6-tetrakis(2-pyridyl)pyrazine, dipicolinic acid, respectively, have been synthesized and<br><br>characterized by elemental analyses, IR, cyclic voltammetry, and electronic spectral studies. Solid state structures of both complexes have been determined by single crystal X-ray crystallography. An ORTEP drawing of two complexes shows that the coordination geometry around the metal center is a distorted octahedron.<br><br>There are extensive conventional intermolecular O–H⋅⋅⋅O, N–H⋅⋅⋅O, and weaker C–H⋅⋅⋅O and C–H⋅⋅⋅Cl<br><br>non-classical hydrogen bonds, which cause the stability of the crystal structure.