Abstract
A novel thiophene based pyrrolo [1, 2-a] quinoxaline (TAAPP) fluorescent sensor, suitable for the nanomolar detection of sodium ions was successfully developed and characterized by various spectroscopic techniques. The fluorescent sensor showed excellent selectivity for sodium ions over other biologically and environmentally important metal ions/biomolecules by a remarkable quenching of fluorescence. Stern-Volmer studies reveal that static quenching predominates over dynamic quenching. The detection limit was found to be 2.219 nM within the linear range of 3 to 30 nM. DFT studies were performed to validate the results. The applicability of the probe can be extended to quantify sodium ions in real samples.
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