Anthranilic Acid Schiff Base as a Fluorescent Probe for the Detection of Arsenite and Selenite: A Detailed Investigation of Analytical Parameters and Mechanism for Interaction

摘要

The exploration of an anthranilic acid based Schiff base?SB?as a “Turn-ON” fluorescent probe for the detection of highly toxic selenite (SeIV) and arsenite (AsIII) species in an aqueous medium is described.The selectivity of?SB?towards SeIV?and AsIII?in the presence of other ions was investigated by some spectrofluorimetric and?1H NMR spectroscopic experiments.The studies revealed the interaction between?SB?and AsIII?via?the deprotonation of phenolic –OH, which enhanced the conjugation in phenolate ion and in turn enhanced the emission response.The?SB?has analytical prospects for the quantification of AsIII?and SeIV?with good sensitivity (LODs; 5.15 ppb for SeIV?and 3.12 ppb for AsIII?calculated by?S/N?= 3σ/K).Furthermore, it can be used to evaluate real and synthetic samples for the presence of SeIV?and AsIII?species as well as the fabrication of on-spot recognition devices (in the form of silica gels?SB@SiO2?and silica coated TLC aluminium strips?SB@SiO2@Al).