Synthesis, crystal structure and luminescence of Ag(I) coordination polymers based on a new sulfonate functionalized terpyridine derivative ligand

Abstract

Two new Ag(I) coordination compounds, [Ag(HTBDS)(H2O)]n·3nH2O (1), [Ag2(TBDS)(2,2′-bipy)(H2O)]n (2) [H2TBDS=4-([4,2′:6′,4″-terpyridine]-4′-yl)benzene-1,3-disulfonic acid, 2,2′-bipy=2,2′-bipyridine] have been successfully synthesized under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, single crystal X-ray diffraction. Compound 1 is formed at the pH value of 5.0, exhibits a 3-connected 2D layer structure with the hcb topological net, and further linked by O–H⋯O and N–H⋯O hydrogen bonds to form a 3D supramolecular framework. When introducing the 2,2′-bipy and increasing the pH value to 6.0, compound 2 is generated. It displays a 3D network with ths topological net. Interestingly, the distorted 2,2′-bipy shows a μ2-η1:η1 bridging mode to connect two Ag(I) ions into a rare six-membered ring with strong Ag⋯Ag interactions, which plays an important role in the formation of the coordination polymer structure of 2. Additionally, the thermal stabilities and photoluminescence properties of 1–2 were also investigated.