Syntheses, Characterization, and Fluorescence Properties of Four Divalent Lead Coordination Polymers based on Zwitterionic Ligands

Four novel divalent lead coordination polymers based on a series of zwitterionic ligands, Pb 2 Cl 4 L 1 ( 1 ), [Pb 2 Cl 4 L 2 ]·2H 2 O ( 2 ), Pb 2 Cl 2 (CH 3 COO) 2 L 2 ( 3 ), and Pb 3 Cl 4 (NO 3 ) 2 L 3 ( 4 ) were solvothermally synthesized and successfully characterized. Single crystal structure studies reveal that compound 1 is a chain structure based on the inorganic “PbCl 2 ” chain motif, whereas compounds 2 – 4 are sheet structures each constructed by inorganic “PbCl 2 ”, “PbCl(CH 3 COO)”, and “Pb 3 Cl 4 ” chain motifs. Hydrogen bonding interactions in term of C–H ··· Cl and C–H ··· O play a key role to form supramolecular 3D structures of 1 – 4 . Additionally, studies of solid state fluorescence indicate 1 – 4 emit in the ultraviolet and visible region that can be assigned to the inter‐ligand π*–π and/or π*–n transitions.