Unique Electrochemiluminescent Behavior of two Quinolones, Enoxacin and Nadifloxacin, and their Sensing Application

Abstract

This research looked at the electrochemiluminescence (ECL) signals of two quinolones: Enoxacin (Enox) and Nadifloxacin (Nadf), which were investigated in H3BO3-Na2B4O7 buffered solutions containing the co-reactant K2S2O8. Based on the fluorescence (FL) spectra, ECL spectra, and corresponding ECL experiments, a possible mechanism of the ECL reaction was proposed. The effect of experimental conditions on quinolone ECL behavior was studied and optimized, so we revealed the value of organic molecules as ECL luminophores. According to calculations, Nadifloxacin has a smaller LUMO-HOMO band gap than Enoxacin, making it more suitable for use as a luminophore. Furthermore, we discovered a quenching effect of lead ion (Pb2+) on the ECL signal of Nadifloxacin, and we focused on the Pb2+ quenching mechanism in this system and made reasonable guesses. We invented a novel technique for ECL detection of Pb2+ with high sensitivity and selectivity. This method demonstrates the potential application of ECL in pollution management.