Novel bismuth and lead coordination polymers synthesized with pyridine-2, 5-dicarboxylates: two single component “white” light emitting phosphors

Abstract

New two-dimensional (2D) bismuth and three-dimensional (3D) lead based coordination polymers containing pyridine-2,5-dicarboxylate ligands (H2pydc) have been synthesized hydrothermally and characterized by single crystal X-ray diffraction. Bi3(μ3-O)2(pydc)2(Hpydc)(H2O)2 (1), which crystallizes in the space group P1̅ (a = 8.7256(5) Å, b = 11.1217(7) Å, c = 14.0933(9) Å, α = 85.239(1)°, β = 98.582(1)°, γ = 71.106(1)°), has a 3D structure that contains Bi6O4 clusters that connect into 2D sheets via linking ligands. The sheets form a 3D supramolecular structure via hydrogen bonding along the z-axis. Pb(pydc)(H2O) (2), which crystallizes in the space group P21/c (a = 10.8343(14) Å, b = 11.2099(15) Å, c = 6.6573(9) Å, β = 90.697(2)°), contains 1D chains of corner-sharing distorted face capped trigonal prisms that are connected into a 3D framework via the pydc ligand. In addition, the ligands are hydrogen bonded to each other. Both 1 and 2 are single component “white” light emitting phosphors and are shown to exhibit “white” luminescence that covers a much wider spectral range than is observed for the as received H2pydc ligand.