Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 82, Issue 24, Pages 13376-13385Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.7b02460
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- Universidad de los Andes
- Colombian Institute for Science and Research (COLCIENCIAS) [120465843502]
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A fluorescence turn-off probe has been designed and successfully applied to detect cyanide (CN-) based on a Michael-type nucleophilic addition reaction and intramolecular charge transfer (ICT) mechanism. For this research, a family of 3-aryl-4-(2,2-dicyanovinyl)-1-(2-pyridinyl)pyrazoles as donor-pi-acceptor (D-pi-A) systems have been synthesized in 58-66% overall yield, by a three-step synthesis sequence starting from p-substituted acetophenones. The substituted p-methoxyphenyl showed good fluorescence emission and large Stokes shifts in different solvents due to its greater ICT. Likewise, this probe evidenced high selectivity and sensitivity and fast recognition for CN- with a detection limit of 6.8 mu M. HRMS analysis, H-1 NMR titration experiments, and TD-DFT calculations were performed to confirm the mechanism of detection and fluorescence properties of the chemodosimeter of CN-. Additionally, fluorescent test paper was conveniently used to detect cyanide in aqueous solution.
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