A highly selective acridine-based fluorescent probe for detection of Al3+ in alcoholic beverage samples

摘要

4,5-Bis(phtalimidomethyl)acridine (L) was studied as a chemosensor for metal ions in alcoholic matrices and showed to be selective for A1(3+), through a linear fluorescence enhancement of 230% in the concentration range of 10-70 mu mol L-1. Benesi-Hildebrand and Job's formalisms indicated the formation of a 1:1 (Al3+:1) complex with a binding constant of 6.30 x 10(3) L mol(-1). DFT/TDDFf calculations allowed access to the energies of frontier orbitals and could explain the fluorescence augmentation upon complex formation, due to the restraining of PET process. Limit of detection and limit of quantification (R-2 = 0.998, least squares method) are 1.130 and 3.768 mu mol L-1, respectively, and validation was verified based on the variation of several analytical conditions. Practical application in spiked Brazilian sugarcane spirit showed recovery of (84 +/- 0.42)% with no effect of interfering ions. (C) 2020 Elsevier B.V. All rights reserved.