Fluorescence intensity decay of silver(I) coordination compound assembled from 4-(2′,3′-dicarboxylphenoxy)benzoic acid with decarboxylation-2′ via in situ

A new coordination compound [Ag(Hcpob)(bpy)]n (1) was assembled by 4-(3′-carboxylphenoxy)benzoic acid (H2cpob), 4,4′-bipyridine (bpy) and AgNO3 under the hydrothermal synthesis. Especially, H2cpob came from the in situ decarboxylation of 4-(2′,3′-dicarboxylphenoxy)benzoic acid (H3dpob) in the hydrothermal reaction. Single-crystal X-ray diffraction reveals that 1 crystallizes in a monoclinic P21/c space group. 1 displays a one-dimensional (1D) fishbone-like double chain structure constructed from Ag(I) ions, bpy ligands and partly deprotonated H2dpob ligands, which further form a three-dimensional (3D) supramolecular architecture via π–π stacking and hydrogen-bonding interactions. In addition, the photoluminescence of 1 has been investigated in detail.

A 2D layer is linked by hydrogen-bonding interactions between adjacent chains in 1 and the photoluminescence properties of 1 have been also investigated. The crystalline polymer has been structurally characterized by single-crystal X-ray diffraction, IR and TGA.Figure optionsDownload as PowerPoint slideHighlights
► The neutral bpy ligand acts as a bridging ligand.
► The 2D layer structure is formed by hydrogen bondings.
► Decarboxylation of H3dpob ligand occurred in the hydrothermal process.
► Compound 1 exhibits fluorescence intensity weaker than the H3dpob ligand at room temperature.