Two novel lead-based coordination polymers for luminescence sensing of anions, cations and small organic molecules

Abstract

Two novel lead-based coordination polymers, namely [Pb(cbdcp)]·0.5H₂O·0.5CH₃OH (1) and [Pb(cbdcp)] (2), have been solvothermally constructed by using a zwitterionic ligand 4-carboxy-1-(3,4-dicarboxy-benzyl)-pyridinium chloride (abbreviated as H₃cbdcpCl). Compound 1 has a three-dimensional framework displaying a valence-bonded SrAl₂ topology with the 4²·6³·8 symbol, while compound 2 has a two-dimensional sheet structure that can be simplified into a three-dimensional π⋯π interaction-connected topology with the {4⁴·6²}₂{4⁸·6¹⁵·8⁵} symbol. Notably, compound 1 proved to be a promising potential luminescent sensor capable of selectively detecting anions, cations and small organic molecules, especially Cr₂O₇²⁻, CrO₄²⁻, Fe³⁺ and nitrobenzene.