Functional Two-Dimensional Coordination Polymer ExhibitingLuminescence Detection of Nitroaromatics

A polyfluorinated-aromatic carboxylic acid has been designed and synthesized by the acylation reaction, tetrafluoro-bis(3,5-dicarboxyphenyl)terephthalamide (H4 bdtfa), which assembled with Zn2+ ions in the mixed solvents of DMF, py, and H2O under solvothermal conditions to produce a two-dimensional (2D) coordination polymer (CP), {[Zn2(bdtfa)(py)3(H2O)]·2DMF}n (1), (py = pyridine, DMF = N,N′-dimethylmethanamide). The final structure has been carefully characterized by various methods including single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), infrared (IR) spectroscopy, and thermogravimetric analysis. Two types of four-coordinated Zn2+ centers present a 2D “sql”-type layer through bdtfa4– ligands, and the adjacent layers are connected through hydrogen bonds and π···π stacking interactions to produce a three-dimensional supramolecular framework. Luminescent results reveal that CP 1 can be regarded as a highly sensitive sensor for detecting nitroaromatics based on the fluorescence quenching...