Abstract:
The luminescent chemosensor properties of Eu(III) carboxylatodibenzoylmethanates with acetic and acrylic acids as applied to ammonia vapors are studied. Quantitative measurements of the optical response revealed a linear increase in the Eu(III) luminescence intensity with increasing analyte concentration in the range of 3–300 ppm. It is shown that the luminescent response is reversible; the ammonia detection limit is 3 ppm. The optical effect mechanism determined by quantum-chemical modeling consists in the interaction of ammonia with a sensor resulted in the formation of a rigid H$_2$O–NH$_3$ structural fragment, which eliminates the luminescence quenching effect of high-frequency OH vibrations. The chemosensors proposed have high sensitivity and selectivity and, hence, can be promising for creating ammonia sensors used in food safety control and environmental monitoring.
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