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.

Graphical abstractOne 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 full-size imageDownload 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.