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Cyanide Anion Determination Based on Nucleophilic Addition to 6-[(E)-(4-Nitrophenyl)diazenyl]-1′,3,3′,4-tetrahydrospiro[chromene-2,2′-indole] Derivatives
| Content Provider | MDPI |
|---|---|
| Author | Migl, ė Dagilienė Giedr, ė Markuckaitė Sonata, Krikštolaitytė Algirdas, Šačkus Martynaitis, Vytas |
| Copyright Year | 2022 |
| Description | This work provides a novel approach for the instant detection of $CN^{−}$ anions based on chromogenic 6-[(E)-(4-nitrophenyl)diazenyl]-1′,3,3′,4-tetrahydrospiro[chromene-2,2′-indole] derivatives. New colorimetric detectors were synthesized and characterized. These compounds exhibited a substantial color change from orange to magenta and blue when treated with cyanide ions in a $CH_{3}$CN solution buffered with sodium phosphate and demonstrated high selectivity to $CN^{−}$ anions. Common anions were tested, and they did not interfere with cyanide detection, except for carbonates and hydrosulfites. The simple preparation of a molecular sensor and the easily noticeable color change makes this a practical system for the monitoring of $CN^{−}$ ions. This color change is explained by nucleophilic substitution of the pyrane ring oxygen atom at the indoline C-2 atom by the cyanide anion. This generates the appearance of intensively colored 4-(4-nitrophenylazo)phenolate chromophore and allows for determining very low levels of $CN^{−}$ anion. |
| Starting Page | 185 |
| e-ISSN | 22279040 |
| DOI | 10.3390/chemosensors10050185 |
| Journal | Chemosensors |
| Issue Number | 5 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-05-14 |
| Access Restriction | Open |
| Subject Keyword | Chemosensors Analytical Chemistry Spiro[chroman-2,2′-indole] Cyanide Determination Colorimetry |
| Content Type | Text |
| Resource Type | Article |
