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

Two novel lead-based coordination polymers, namely [Pb(cbdcp)]center dot 0.5H(2)O center dot 0.5CH(3)OH (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 H(3)cbdcpCl). Compound 1 has a three-dimensional framework displaying a valence-bonded SrAl2 topology with the 4(2)center dot 6(3 center dot)8 symbol, while compound 2 has a two-dimensional sheet structure that can be simplified into a three-dimensional pi center dot center dot center dot pi interaction-connected topology with the {4(4)center dot 6(2)}(2){4(8)center dot 6(15)center dot 8(5)} 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.