Solvothermal self-assembly of Cd2+ coordination polymers with supramolecular networks involving N-donor ligands and aromatic dicarboxylates: synthesis, crystal structure and photoluminescence studies

Abstract

Two cadmium(II) coordination polymers (CPs) of compositions {[Cd(H₂O)₄(4-BPDB)][BPDC]}_n (CP1) and {[Cd(H₂O)(BrIP)(BTTMB)]·4MeOH}_n (CP2) have been synthesized by solvothermal methods and characterized by several analytical methods including SXRD (Single Crystal X-ray Diffraction). The structure of CP1 can be described as a 1D cationic chain, {[Cd(H₂O)₄(4-BPDB)]²⁺}_n and discrete BPDC counter anions. The structure of CP2 revealed an undulated 2D sql net comprising Cd²⁺ nodes bridged by the ditopic N-donor, BTTMB and dicarboxylate BrIP involved in μ₂–η¹η¹η¹η¹ coordination. Supramolecular interactions in both CPs generate 3D hydrogen bonded architectures. The solid state fluorescence properties of these d¹⁰ metal ion containing CPs have been investigated. Fluorescence emission of CP1 suspended in acetonitrile is observed to be selectively quenched by acetone (LOD = 0.15 mM) over other common laboratory solvents.