Designing of selective ligands for the effective and rapid detection of uranyl cation is an actual problem for the nuclear power, environmental, biological, medical science and toxicology. It is known that 8-hydroxyquinoline (8-HQ) and phosphoryl-containing ligands effectively bind various metal ions including uranyl ion. Due to the effectiveness of 8-HQ and phosphoryl group, the synthesis of phosphoryl-containing derivatives of 8-HQ and the study of their selectivity towards uranyl ion are of interest. For the first time, phosphoryl-containing derivatives of 8-HQ diphenyl((8-oxyquinolyl)methyl)phosphine oxide (L1) and bis((8-oxyquinolyl)methyl) phosphinic acid (L2) were synthesized. The crystal structure of L1 was determined by X-ray analysis. The complexation between uranyl cation and ligands L1, L2 was studied. The complexes [UO2(NO3)2L1] (I) and [UO2(NO3)3HL2]∙HNO3∙H2O (II) were synthesized and characterized by an elemental analysis, IR and NMR spectroscopy as well as X-ray analysis. The stability constants of the UO22+L1, UO22+L2 and Lu3+L1 complexes in ethanol were determined by the method of spectrophotometric titration. The stability constant of UO22+L1 significantly exceeds that of UO22+L2 and Lu3+L1. L1 shows a high selectivity towards UO22+. Potentiometric sensor based on L1 was developed for the selective detecting of uranyl cations in water with a low measured detection limit of 8.1·10-6 mol L-1. This provides a basis for the effective, rapid and low-cost detection of UO₂²⁺ ions.

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