Abstract
Based on Rhodamine moiety, a novel phosphorus fluorescent sensor as 2-(6-(diethylamino)-2-((diphenylphosphoryl) methyl)-3-oxo-3-3H-xanthen-9-yl) benzoic acid (ROAP) is firstly designed and synthesized for the detection of Fe3+ in solution. The recognition effect of ROAP sensor is investigated carefully in dimethyl sulfoxide-water (DMSO-H2O) (fw = 70%) dispersion system. Fe3+ ion can lead to the quenching fluorescence and fading color of ROAP sensor. The as-prepared ROAP sensor shows high sensibility, selectivity, and anti-interference for Fe3+ in the concentration range of 0–5 equivalents. The recognition mechanism of the sensor is attributed to the combination of Fe3+ ions with the ROAP sensor via O atoms of PO and OH groups. The stoichiometric ratio of ROAP and Fe3+ complexation is 2:1. The probe also exhibits good reversibility, and high potential commercial applications in the future.
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