Construction of one pH-independent 3-D pillar-layer lead-organic framework containing tetrazole-1-acetic acid

One new 3-D PbII complex, {[Pb2(tza)(μ3-OH)(μ3-Cl)(μ4-Cl)]n (1) (Htza = tetrazole-1-acetic acid), has been synthesized from the reaction of tetrazole-1-acetic acid (Htza) with PbCl2 at pH = 8.5 under hydro-solvent condition and characterized by X-ray single crystal diffraction, elemental analysis, thermogravimetric analysis, and IR spectra. The results show that the coordination chemistry of the multi-dentate ligand Htza on PbII ion has good pH sensitivity. At pH = 5 and 7, two once reported 3-D framework complexes {[Pb(tza)2]n (2) and [Pb(tza)(μ3-Cl)]n (3) are obtained, respectively. And then at pH = 8.5, the resultant three-dimensional complex 1 presents the pillar-layer framework network with a thickness of 8.25 Å of layer [Pb2(μ3-OH)(μ2-O)2(μ3-Cl)(μ4-Cl)]n, in which there still exists the μ3-bridging mode of OH− group and the μ2-carboxyl oxygen atom besides the μ3- and μ4-bridging manners of the Cl− ion. Furthermore, the luminescent property of complex 1 has also been investigated, and the result exhibits blue photoluminescence in the solid state at room temperature, which shows that this complex may be a good candidate for photoactive material.

One new 3-D pH-independent lead-organic framework constructed from two-dimensional oxo-/Cl-bridged lead-based layers {[Pb4(μ3-OH)2(μ2-O)2(μ3-Cl)2(μ4-Cl)2}n and tza− pillars was synthesized and characterized. The blue fluorescence property in the solid state at room temperature shows the title complexes may be good candidates for photoactive material.Figure optionsDownload as PowerPoint slideHighlights
► One 3D framework from [Pb4(μ3-OH)2(μ2-O)2(μ3-Cl)2(μ4-Cl)2]n layer and tza− pillar
► 2-D lead-based layer is formed via oxo-/Cl-bridges.
► The complex is one good candidate for photoactive material.