Tunable luminescent behaviors of Ag-containing metal coordination polymers with N-heterocyclic and sulfonate group

Abstract

Three new metal coordination polymers, namely, [Ag(BPYE)(BS)] (1), [Ag2(BPY)2(BS)(NO3)(H2O)2]·H2O (2), and [Ag2(BPY)2(ABS)(NO3)]·H2O (3) [BS = benzenesulfonate, BPYE = 1,2-bi(4-pyridyl)ethene, BPY = 4,4′-bipyridine, ABS = p-aminobenzenesulfonate], have been obtained under solvothermal conditions, which were structurally characterized by X-ray single-crystal diffraction, EA, PXRD, FT-IR, thermogravimetry analysis (TGA) and differential scanning calorimetric (DSC). These complexes show a one-dimensional (1D) polymeric structure, which will further be constructed a three-dimensional (3D) supramolecular framework via hydrogen bonding, π⋯π stacking interactions and CH⋯π interactions. The shortest distances of π⋯π packing interactions of complexes 1–3 are 3.644, 3.558 and 3.780 Å, respectively. The luminescent properties of complexes 1–3 were investigated in the solid state at room temperature, where the maximal emission peaks can be observed at 418 (λex = 350), 364 (λex = 320) and 474 nm (λex = 364 nm), respectively. Obviously, the emission maxima are proportional to the intermolecular π⋯π packing distances.