Triphenylamine-containing imine-linked porous organic network for luminescent detection and adsorption of Cr(VI) in water.

In this study, an imine-linked luminescent porous organic network (PON) has been successfully synthesized by the Schiff-base condensation reaction between 1,2-diphenylethylenediamine and tris(4-formylphenyl)amine. It exhibits strong fluorescence in an aqueous dispersion and can be applied as a luminescent probe for Cr(VI) (CrO42- and Cr2O72-) with high selectivity and sensitivity (LOD for Cr2O72- and CrO42- were below 0.35 µM and 0.4 µM, respectively) in a turn-off manner. The possible luminescence sensing mechanism and the adsorption capacity of Cr(VI) are also discussed in detail.