Bifunctional fluorescent quenching detection of 2,4,6-trinitrophenol (TNP) and acetate ions via 4,4′-(9,9-dimethyl-9H-fluorene-2,7-diyl) dibenzoic acid

The 4,4'-(9,9-dimethylfluorene-2,7-diyl)dibenzoic acid (5) was synthesized using commercial fluorene as the starting material followed by processes of bromination, methylation, Suzuki coupling and hydrolysis. We reported it as an exclusive fluorescence sensor for 2,4,6-trinitrophenol (TNP) and acetate ions for the first time. The experimental results suggested a high efficiency for TNP detection with K-SV values of 21,215 M-1, which has achieved to micromolar level (10 mu M) of this material. Moreover, the detection limit (1.39 x 10(-6) M) was measured according to the fluorescence intensity changes of Ac- in CH3CN. (C) 2016 Elsevier Ltd. All rights reserved.