Crystal structure of a binuclear polymeric self-assembled lead(II) complex

Abstract

A polymeric self-assembled complex {[Pb(pydc)(pydc·H2)(H2O)2] 2]n is prepared from the complexation of a novel pyridine containing self-assembling system, LH2, [pyda·H2]2+[pydc]2- (pyda = 2,6-pyridindiamine and pydc·H2 = 2,6-pyridinedicarboxilic acid) and lead(II) nitrate in 84% yield. The characterization was performed using X-ray crystallography. The crystal system is triclinic with space group PT and two molecules per unit cell. The unit cell dimensions are a = 6.913(2)Å, b = 10.687(4)Å and c = 11.182(4)Å with α = 92.805(6)° β = 101.821(6)° and γ 95.688(6)°. The final R value is 0.0373 for 4633 reflections measured. This compound is a nine-coordinate binuclear complex with two metal fragments linked via the central four-membered Pb2O2 ring. The crystal also contains a neutral [pydc·H2] molecule, that form hydrogen and coordination bonds that dominate the crystal packing, by forming layers of molecules.