A highly selective fluorescent chemosensor for CN- based on a novel bis(salamo)-type tetraoxime ligand

The optical properties of a novel chemosensor for cyanide anions based on a symmetric bis(salamo)-type ligand (H3L) were investigated by UV-Vis and fluorescence spectroscopy in MeOH/H2O (1:1 v/v) solution. Sensor H3L can selectively sense CN- based on prominent color changes among other anions. The chemosensor exhibits an apparent fluorescence enhancement at 482 nm to CN- which because cyanide ions interact with bonds. Combining the corrected Benesi-Hildebrand formula, the binding constant of the formed host-guest complex was calculated as 2.42 x 10(5) M-1. Meanwhile, the detection limit of the sensor toward CN- was 8.91 x 10(-7) M. It is worth noting that the designed sensor can be used for rapid detection of cyanide anions in basic pH range, and has great practical value. (C) 2017 Elsevier B.V. All rights reserved.