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Receptor-free phenothiazine derivative as fluorescent probe for picric acid: Investigation of the inner filter effect
Arunkumar Kathiravan1, Mahalakshmi Narayanan1, Mariadoss Asha Jhonsi2
1Department of Chemistry & (1)Centre for Molecular Photoscience, Vel Tech Rangarajan Dr. Sagunthala R & D Institute of Science and Technology, Avadi, Chennai - 600 062, Tamil Nadu, India.
Abstract:
In this study, a highly fluorescent and receptor-free phenothiazine derivative (PDAB) was developed to detect picric acid. A combination of steady-state and time-resolved fluorescence studies was conducted to examine the excited state behavior of PDAB with picric acid in solution. The PDAB probe displayed a significant degree of selectivity and was highly sensitive to picric acid, with an extremely low detection limit of 9.82 nM. Time-resolved fluorescence quenching studies exhibit direct evidence of an inner filter effect-based sensing mechanism. Using the Parker equation, a thorough analysis was done to correct the inner filter effect on the sensing of picric acid. Overall, these studies provide critical information on the sensing mechanism for picric acid detection.
