Fluorescent Zn(II) frameworks with multicarboxylate and pyridyl N-donor ligands for sensing specific anions and organic molecules.

Three novel fluorescent Zn(II) frameworks, namely [Zn(DPA)(NDA)] 2 ·2DMF (1), [Zn 2 (DPA)(OBA) 2 ]·2DMF·4H 2 O (2) and [Zn(DPA)(HNTB)]·H 2 O (3) (DPA = 2,5-di(pyridin-4-yl)aniline, H 2 NDA = 1,4-naphthalenedicarboxylic acid, H 2 OBA = 4,4'-oxydibenzoic acid, H 3 NTB = 4,4',4''-nitrilotribenzoic acid, DMF = N , N -dimethylformamide), were successfully fabricated and structurally characterized. Due to the variety of organic linkers, 1-3 exhibit varied topologies: 1 is a 4-c three-dimensional (3D) framework with {6 5 ·8} topology, 2 is a 6-c 3D net with point symbol of {4 4 ·6 10 ·8}, and 3 is a 4-c two-dimensional network that further stacks into a 3D structure by hydrogen bonding interactions with {4 4 ·6 2 } topology. Experiments related to fluorescence show that 1-3 can be utilized to quickly identify specific anions of CrO 4 2- /Cr 2 O 7 2- , and organic molecules such as 2,4,6-trinitrophenol and benzaldehyde.