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

摘要

> 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.