Photoluminescent lead(II) coordination polymers stabilised by bifunctional organoarsonate ligands.

Four lead(II) coordination polymers were isolated under hydro(solvo)thermal conditions. The applied synthetic methodology takes advantage of the coordination behaviour of a new bifunctional organoarsonate ligand, 4-(1, 2, 4-triazol-4-yl)phenylarsonic acid (HTPAA) and involves the variation of lead(II) reactants, metal/ligand mole ratios, and solvents. The constitutional composition of the four lead(II) coordination polymers can be formulated as [Pb(TPAA)(HTPAA)(NO)]·6HO (), [Pb(TPAA)(HTPAA)]·DMF·0.5HO (DMF = N, N-Dimethylformamide) (), [PbCl(TPAA)HO] (), and [PbCl(TPAA)(HTPAA)HO]Cl (). The compounds were characterized by single-crystal and powder x-ray diffraction techniques, thermogravimetric analyses, infra-red spectroscopy, and elemental analyses. Single-crystal x-ray diffraction reveals that and represent two-dimensional (2D) layered structures whilst and form three-dimensional (3D) frameworks. The structures of , and contain one-dimensional (1D) {Pb/AsO} substructures, while is composed of 2D {Pb/AsO} arrays. Besides their interesting topologies, - all exhibit photoluminescence properties in the solid state at room temperature.