Tuning zinc(II) coordination architectures by rigid long bis(triazole) and different carboxylates: Synthesis, structures and fluorescence properties

Abstract

Three metal–organic coordination polymers containing rigid bis(triazole) ligand, namely, [Zn1.5(btb)(nbta)(H2O)]n (1), {[Zn(btb)(3-nph)]·(H2O)}n (2) and [Zn(btb)(4-nph)]n (3) (btb=4,4′-bis(1,2,4-triazolyl-1-yl)-biphenyl, 3-H2nph=3-nitrophthalic acid, H3nbta=5-nitro-1,2,3-benzenetricarboxylic acid, and 4-H2nph=4-nitrophthalic acid) were synthesized under hydrothermal conditions and structurally characterized by X-ray single-crystal diffraction. Complex 1 possesses an interesting 3D coordination framework with a rarely binodal (4,4)-connected frl topological structure. Complexes 2 and 3 exhibit similiar 2D (4,4) grid layers with different point symbol (44·64) in 2 and (44·62) in 3. Furthermore, thermal stability of these compounds has been discussed. Complexes 1–3 exhibit strong solid-state fluorescence at room temperature in solid state.