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, [Zn 1.5 (btb)(nbta)(H 2 O)] n ( 1 ), {[Zn(btb)(3-nph)]·(H 2 O)} n ( 2 ) and [Zn(btb)(4-nph)] n ( 3 ) (btb = 4,4′-bis(1,2,4-triazolyl-1-yl)-biphenyl, 3-H 2 nph = 3-nitrophthalic acid, H 3 nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, and 4-H 2 nph = 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 (4 4  · 6 4 ) in 2 and (4 4  · 6 2 ) 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.