A simple quinoline derivative as fluorescent probe with high sensitivity and selectivity selectivity for Al3+ in aqueous solution

A simple Al3+ receptor, 2-hydroxyquinoline-3-aldehyde-(benzoyl)hydrazone (L), has been synthesized by condensing 2-hydroxyquinoline-3-aldehyde with benzoic hydrazide. L displayed a high selectivity and pronounced fluorescence enhancement for Al3+ over other common cations in water. Moreover, based on the Job's plot, ESI-MS spectrometry, it could be considered that L and Al3+ were coordinated with a 1:1 ratio. In addition, the detection limit of L for sensing Al3+ was calculated to be 7.21 x 10(-8) M, which was lower than the acceptable limit of Al3+ level in drinking water defined by World Health Organization (WHO) (1.85 x 10(-6) M). These results indicated that this chemical sensor L could be used as a serviceable molecular probe for practical applications. (C) 2018 Elsevier Ltd. All rights reserved.