Tuning the net topology of a ternary Ag(i)-1,2,4,5-tetra(4-pyridyl)benzene-carboxylate framework: structures and photoluminescence

Abstract

The dye molecule 1,2,4,5-tetra(4-pyridyl)benzene (bztpy), a tetradentate ligand, can be an excellent candidate for construction of coordination polymers with photoluminescence properties. Here, based on Ag(I) and bztpy, three novel complexes, namely [Ag₂(bza)₂(μ₄-bztpy)] (1), [Ag₂(μ-ipa)(μ₄-bztpy)]·EtOH·3H₂O (2) and [Ag₃(pda)(μ-pda)_1/2(μ₄-bztpy)₂]·3EtOH·6H₂O (3) (Hbza = benzoic acid, H₂ipa = isophthalic acid and H₂pda = 2,4-pyridinedicarboxylic acid), have been synthesized with the assistance of auxiliary carboxylates. The choice of carboxylates was found to have a pronounced effect on the framework topology. Structural analysis revealed that there are [Ag₂(bztpy)]_∞ chains as basic side groups and the change of interconnected auxiliary ligands from Hbza to H₂pda leads to the formation of 1D, 2D and 3D structures, respectively. They were further characterized by elemental analysis, IR, single-crystal X-ray diffraction and luminescence study.