Abstract
Abstract A new fluorescent sensor, N′ -[(2-hydroxyphenyl)methylidene]imidazo[1,2- a ]pyridine-2-carbohydrazide ( S ), has been synthesized via Schiff-base condensation between imidazo[1,2- a ]pyridine-2-carbohydrazide and salicylaldehyde. It exhibited high sensitivity and selectivity towards Al 3+ through a significant “turn-on” fluorescence response at 446 nm in DMSO-H 2 O (9:1,v:v) 10 mM of HEPES buffer solution at pH 7.4 with a detection limit down to 4.55 × 10 −11 M. Intriguingly, sensor S could also act as a pH sensor to detect the pH values of alkali environment by inhibiting the PET process. The optimized structure of S and its sensing mechanism for Al 3+ has been confirmed by density functional theory (DFT) and time-dependent density functional theory (TDDFT) calculations with 6-31G(d) basis sets using a suite of Gaussian 09 programs.
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