Uranyl Organic Framework as a Highly Selective and Sensitive Turn-on and Turn-off Luminescent Sensor for Dual Functional Detection Arginine and MnO.

Five new uranyl coordination polymers were prepared by the hydrothermal method based on 5-nitroisophthalic acid (Hnip) as (UO)(nip)(2,2'-bpy) (), (H4,4'-bpy)·[(UO)(nip)]·(4,4'-bpy) (), (Hbpe)·[(UO)(nip)] (), (H bpp)·[(UO)-(nip)]·HO (), and (Htmp)·(UO)(nip) [2,2'-bpy = 2,2'-bipyridine, 4,4'-bpy = 4,4'-bipyridine, bpe = 4,4'-vinylenedipyridine, bpp = 4,4' -trimethylenedipyridine, tmp = tetramethylpyrazine]. All of these synthesized complexes have been characterized by single crystal and powder X-ray diffraction, IR spectra, thermogravimetric analysis, elemental analysis, and luminescent properties. In particular, it is found that compounds and can be used as a luminescent sensor to efficiently detect arginine in aqueous solution by means of "turn-on"; the detection limits were 1.06 × 10 and 6.42 × 10 mol/L, respectively. Moreover, can also be used as a bifunctional sensor for selective sensing of MnO anion by "turn-off". The detection limit of MnO in water was 1.79 × 10 mol/L; the was 1.88 × 10. The sensing effect of arginine in simulated grape juice samples and MnO in simulated river water samples was also investigated by this sensing system with high recovery. In addition, the possible mechanism of sensing arginine and MnO in the aqueous solution was discussed.