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Novel colorimetric sensors for cyanide based on azo-hydrazone tautomeric skeletons
The monoazo dyes, 4-carboxyl-2, 6-dinitrophenylazohydroxynaphthalenes dyes (AZ-01, AZ-03 and AZ-04), were evaluated as a highly selective colorimetric chemosensor for cyanide ion. The recognition of cyanide ion gave an obvious colour change from light yellow to brownish red and upon dilution with ac...
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2014
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| LEADER | 00000njm a2000000a 4500 | ||
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| 001 | oai:repository.ui.edu.ng:123456789/12084 | ||
| 042 | |a dc | ||
| 720 | |a Adegoke, O. A. |e author | ||
| 720 | |a Adesuji, T. E. |e author | ||
| 720 | |a Thomas, O. E. |e author | ||
| 260 | |c 2014 | ||
| 520 | |a The monoazo dyes, 4-carboxyl-2, 6-dinitrophenylazohydroxynaphthalenes dyes (AZ-01, AZ-03 and AZ-04), were evaluated as a highly selective colorimetric chemosensor for cyanide ion. The recognition of cyanide ion gave an obvious colour change from light yellow to brownish red and upon dilution with acetone produced a purple to lilac colour. Optimum conditions for the reaction between the azo dyes and cyanide ion were established at 300C for 5 min, and different variables affecting the reaction were carefully studied and optimised. Under the optimum conditions, linear relationships between the CN- concentrations and light absorption were established. Using these azo-hydrazone molecular switch entities, excellent selectivity towards the detection of CN- in aqueous solution over miscellaneous competitive anions was observed. Such selectivity mainly results from the possibility of nucleophilic attack on the azo-hydrazone chemosensors by cyanide anions in aqueous system, which is not afforded by other competing anions. The cyanide chemosensor method described here should have potential application as a new family probes for detecting cyanide in aqueous solution. | ||
| 024 | 8 | |a 1386-1425 | |
| 024 | 8 | |a ui_art_adegoke_novel_2014 | |
| 024 | 8 | |a Molecular and Biomolecular Spectroscopy 128, pp. 147-152. | |
| 024 | 8 | |a https://repository.ui.edu.ng/handle/123456789/12084 | |
| 653 | |a 4-carboxyl-2 | ||
| 653 | |a 6-dinitrophenylazohydroxylnaphthalenes | ||
| 653 | |a Azo-hydrazone tautomeric switch | ||
| 653 | |a Cyanide | ||
| 653 | |a Chemosensor | ||
| 653 | |a Aqueous medium | ||
| 245 | 0 | 0 | |a Novel colorimetric sensors for cyanide based on azo-hydrazone tautomeric skeletons |