Unusual 3D pillared-layer Pb(II) complex supported by mercapto-triazole ligand: Synthesis, structure and luminescent property

Reaction of 4-amino-3-(4-pyridyl)-5-mercapto-1,2,4-triazole (a-Hptt) with PbCl2 hydrothermally has yielded complex [PbCl(ptt)]n (1) at pH 5. And the ligand a-Hptt can be deaminated and transformed into Hptt under hydrothermal condition (pH 5). The structure of 1 has been fully characterized by single crystal X-ray diffraction, elemental analysis, IR, as well as luminescent property. Structural analysis reveals that complex 1 is constructed from 2D two-component layers, which alternately arrange in the ⋯ABAB⋯ pattern, and then further pillared by Hptt ligands into an interesting 3D “pillared-layer” architecture. Complex 1 also shows strong luminescence emission in solid state at room temperature and may be suitable as a candidate for potentially photoactive material.

Graphical abstractUnusual 3D pillared-layer Pb(II) complex with a (4,8)-connected topology of (32·48·512·62·74)(32·45·53) has been prepared by 4-amino-3-(4-pyridyl)-5-mercapto − 1,2,4-triazole (a-Hptt) under hydrothermal condition. Structural analysis of 1 reveals that a-Hptt can be deaminated and transformed into Hptt at pH 5. 1 also shows strong luminescence emission in solid state at room temperature.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Unusual 3D pillared-layer Pb(II) complex 1 has been obtained by a-Hptt under hydrothermal condition. ► Structural analysis of 1 shows that a-Hptt can be deaminated and transformed into Hptt at pH 5. ► This work provides a potential photoactive material with strong luminescence emission in solid state.