An Electroactive Zinc-based Metal-Organic Framework: Bifunctional Fluorescent Quenching Behavior and Direct Observation of Nitrobenzene.

This work reports on the facile synthesis, characterization, and electroactivity of a zinc-based [Zn(TTPA)(DHTP)]·2DMF (, TTPA = tris(4-(1-1,2,4-triazol-1-yl)phenyl)amine, DHTP = dihydroxylterepthate) metal-organic framework, which has multifunctional properties due to its electroactive framework, permanent porosity, robust structure, and fluorescent nature. Topology analyses indicate that contains a 3,4,4-c net. Sorption studies indicate that is a suitable adsorbent for CO with a capacity of 10.2 wt % at 298 K; the capacity increased to 16.7 wt % at a lower temperature, 273 K. The incorporation of the redox-active TTPA ligand as an electron donor renders to be an electroactive framework. The generation of radical cations from the chemical oxidation of resulted in fluorescent quenching. The combination of porosity, fluorescence, and electroactivity in one entity suggests that could serve as a sensing material for the detection of nitrobenzene. Exposing nitrobenzene to quenches the fluorescent via host-guest interactions. The detection site of nitrobenzene in framework was confirmed by single-crystal X-ray diffraction, [Zn(TTPA)(DHTP)]·(HO)(DMF)(2NB) or ⊂ NB. In addition, the inclusion of nitrobenzene into the framework stabilized the disordered molecules via strong hydrogen bonding. These findings indicate that versatile MOFs with multifunctional properties can be realized via a systematic design.