Structural diversity of metal–organic materials containing bismuth (III) and pyridine-2, 5-dicarboxylate

Abstract

Three new metal–organic materials containing bismuth and pyridine-2,5-dicarboxylate (pydc) have been synthesized by hydro- and solvothermal methods and have been characterized by single crystal X-ray diffraction. Compound 1, Bi(pydc)(Hpydc)(H2O), crystallizes in the space group P21/c (a = 15.4528(10) Å, b = 7.8242(5) Å, c = 12.7421(8) Å, β = 109.463(1)°) and consists of one-dimensional (1D) chains that assemble into a three-dimensional (3D) supramolecular structure via hydrogen bonding in the x-and y-directions. An interesting complex anionic layer structure containing K+ ions and water molecules in the interlayer regions is observed for compound 2, K4Bi(pydc)3(Hpydc)(H2O)3.3, which crystallizes in the space group P1̅ (a = 9.2359(5) Å, b = 9.5854(5) Å, c = 20.1439(10) Å, α = 86.062(1)°, β = 87.645(1)°, γ = 87.729(1)°). This appears to be the first example of a layered anionic bismuth metal–organic structure where the anionic slabs are separated by positively charged counterions in the interlayer region. Compound 3, (DMA+)3Bi(pydc)2(Hpydc)2 (DMA+ = dimethyl ammonium cation), space group P1̅ (a = 9.6953(6) Å, b = 11.7437(7) Å, c = 18.0006(11) Å, α = 73.282(1)°, β = 78.913(1)°, γ = 78.072(1)°), has a 1D supramolecular chain structure that extends along the x-direction that also contains four-connected nodes of anionic bismuth building block similar to compound 2. The photoluminescent properties of compound 1 are discussed.