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

A polymeric self-assembled complex {[Pb(pydc)(pydc.H-2)(H2O)(2)](2)}(n) is prepared from the complexation of a novel pyridine containing self-assembling system, LH2, [pyda.H-2](2+)[pydc](2-) (pyda = 2,6-pyridindiamine and pydc.H-2 = 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 P-(1) over bar and two molecules per unit cell. The unit cell dimensions are a = 6.913(2)Angstrom, b = 10.687(4)Angstrom and c = 11.182(4)Angstrom with alpha = 92.805(6)degrees, beta = 101.821(6)degrees and gamma = 95.688(6)degrees. 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.H-2] molecule, that form hydrogen and coordination bonds that dominate the crystal packing, by forming layers of molecules.