title: Photoluminescent lead(II) coordination polymers stabilised by bifunctional organoarsonate ligands.
abstract: 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 (H2TPAA) 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 [Pb2(TPAA)(HTPAA)(NO3)]·6H2O (1), [Pb2(TPAA)(HTPAA)2]·DMF·0.5H2O (DMF = N, N-Dimethylformamide) (2), [Pb2Cl2(TPAA)H2O] (3), and [Pb3Cl(TPAA)(HTPAA)2H2O]Cl (4). 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 that1and2represent two-dimensional (2D) layered structures whilst3and4form three-dimensional (3D) frameworks. The structures of1,2,and4contain one-dimensional (1D) {PbII/AsO3} substructures, while3is composed of 2D {PbII/AsO3} arrays. Besides their interesting topologies,1-4all exhibit photoluminescence properties in the solid state at room temperature.
authors.forename: Jian-Di
authors.initials: JD
authors.lastname: Lin
authors.affiliation: School of Chemistry & CRANN, University of Dublin, Trinity College, Dublin 2, Ireland.
authors.forename: Camelia I
authors.initials: CI
authors.lastname: Onet
authors.affiliation: School of Chemistry & CRANN, University of Dublin, Trinity College, Dublin 2, Ireland.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schmitt
keywords: coordination polymers; lead; metal-organic frameworks; phtoluminesence; x-ray crystallography