| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 740063 | Sensors and Actuators B: Chemical | 2014 | 5 Pages |
•A new and high selective turn on fluorescence sensor for CN− was developed.•The mechanism is based on nucleophilic addition reaction of cyanide anion.•The detection limit was found to be 45 nmol/L.
A new compound was conveniently synthesized via the condensation of 2-hydroxy-1,3,5-benzenetricarbaldehyde (1) with 1-methyl-2,3,3-trimethyl-3H-indolium (2) in ethanol. Its recognition ability was firstly carried out in DMSO. After addition of all kinds of anions, only CN− can induce a turn on fluorescence accompanying a blue-green fluorescence color. The mechanism is based on nucleophilic addition reaction of cyanide anion with the polarized CN bond of the indolium group blocking the π-conjugation between indolium and 2-hydroxy-1,3,5-benzenetricarbaldehyde, which was proved by H NMR and ESI-MS. In addition, the detection was completed with 2 min and the detection limit was found to be 45 nmol/L.
Graphical abstractThe nucleophilic nature of cyanide is used to develop a simple, sensitive, and highly effective sensor. So we developed a new fluorescence probe for cyanide-based 1-methyl-2,3,3-trimethyl-3H-indolium and 2-hydroxy-1,3,5-benzenetricarbaldehyde. Among the tested anions, only CN− could turn on the fluorescence intensity suggesting that the system was a highly selective sensor for CN−. The concentration of the cyanide anions that could be detected was as low as 45 nmol/L.Figure optionsDownload full-size imageDownload as PowerPoint slide
