Synthesis and Evaluation of an Azo Dye for the Chromogenic Detection of Metal Cations

Martins, Cátia D. F.; Raposo, M. Manuela M.; Costa, Susana P. G.

doi:10.3390/ecsoc-26-13556

Cited by 1 publication

(3 citation statements)

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“…This compound was obtained by precipitation as a dark red solid in high yield (92%), without further purification. The structure of Dabcyl 2 was confirmed by 1 H and 13 C NMR spectroscopy ( Figures S1 and S2 ), which was in agreement with the previously reported assignment [ 27 ].…”

Section: Resultssupporting

confidence: 90%

“…Dye 2 was prepared by an azo coupling reaction between the diazonium salt of 4-aminobenzoic acid 1 and N , N -dimethylaniline, as previously published by us ( Scheme 1 ) [ 27 ]. This compound was obtained by precipitation as a dark red solid in high yield (92%), without further purification.…”

Section: Resultsmentioning

confidence: 99%

“…All the chemicals and solvents were purchased from Acros Organics (Geel, Belgium) and Sigma-Aldrich (St. Louis, MO, USA) and were used as received. The synthesis and structural characterization of Dabcyl acid 2 has been reported by us elsewhere [ 27 ]. UV-Vis absorption spectra were collected using a Shimadzu UV/2501PC spectrophotometer (Shimadzu Europa GmbH, Duisburg, Germany) in standard quartz cuvettes with a 1 cm optical path.…”

Section: Methodsmentioning

confidence: 99%

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Dabcyl as a Naked Eye Colorimetric Chemosensor for Palladium Detection in Aqueous Medium

Martins,

Raposo,

Costa

2023

Molecules

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Industrial activity has raised significant concerns regarding the widespread pollution caused by metal ions, contaminating ecosystems and causing adverse effects on human health. Therefore, the development of sensors for selective and sensitive detection of these analytes is extremely important. In this regard, an azo dye, Dabcyl 2, was synthesised and investigated for sensing metal ions with environmental and industrial relevance. The cation binding character of 2 was evaluated by colour changes as seen by the naked eye, UV-Vis and 1H NMR titrations in aqueous mixtures of SDS (0.02 M, pH 6) solution with acetonitrile (99:1, v/v). Out of the several cations tested, chemosensor 2 had a selective response for Pd2+, Sn2+ and Fe3+, showing a remarkable colour change visible to the naked eye and large bathochromic shifts in the UV-Vis spectrum of 2. This compound was very sensitive for Pd2+, Sn2+ and Fe3+, with a detection limit as low as 5.4 × 10−8 M, 1.3 × 10−7 M and 5.2 × 10−8 M, respectively. Moreover, comparative studies revealed that chemosensor 2 had high selectivity towards Pd2+ even in the presence of other metal ions in SDS aqueous mixtures.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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