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)] ·2DMF (1), [Zn (DPA)(OBA) ]·2DMF·4H O (2) and [Zn(DPA)(HNTB)]·H O (3) (DPA = 2,5-di(pyridin-4-yl)aniline, H NDA = 1,4-naphthalenedicarboxylic acid, H OBA = 4,4'-oxydibenzoic acid, H NTB = 4,4',4''-nitrilotribenzoic acid, DMF = , -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 ·8} topology, 2 is a 6-c 3D net with point symbol of {4 ·6 ·8}, and 3 is a 4-c two-dimensional network that further stacks into a 3D structure by hydrogen bonding interactions with {4 ·6 } topology. Experiments related to fluorescence show that 1-3 can be utilized to quickly identify specific anions of CrO /Cr O , and organic molecules such as 2,4,6-trinitrophenol and benzaldehyde.