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Nanoparticle-based, organic receptor coupled fluorescent chemosensors for the determination of phosphate
journal contributionposted on 2014-01-01, 00:00 authored by N Kaur, S Kaur, A Kaur, P Saluja, Hemant Sharma, A Saini, N Dhariwal, A Singh, N Singh
The sensors have been developed using silver nanoparticles coated with organic ligands and are fully characterized with spectroscopic methods. The energy-dispersive X-ray (EDX) analysis revealed the presence of organic receptors on the surface of metal nanoparticles. These chemosensors were tested against a range of biological and environmentally relevant cations in the HEPES buffered DMSO/H2O (8:2, v/v) solvent system. The fluorescence intensity of these chemosensors was quenched upon coordination with open shell metal ions such as Cu2+/Fe3+. Anion recognition properties of the corresponding metal complexes have been studied and the original fluorescence intensity of sensors was restored upon addition of phosphate (0–20 µM). Thus, a highly selective chemosensor has been devised for the micromolar estimation of phosphate in semi-aqueous medium.