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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 \u00d7 10\u22128 M, 1.3 \u00d7 10\u22127 M and 5.2 \u00d7 10\u22128 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.<\/jats:p>","DOI":"10.3390\/molecules28166111","type":"journal-article","created":{"date-parts":[[2023,8,17]],"date-time":"2023-08-17T10:47:02Z","timestamp":1692269222000},"page":"6111","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Dabcyl as a Naked Eye Colorimetric Chemosensor for Palladium Detection in Aqueous Medium"],"prefix":"10.3390","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6316-864X","authenticated-orcid":false,"given":"C\u00e1tia D. F.","family":"Martins","sequence":"first","affiliation":[{"name":"Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7996-1626","authenticated-orcid":false,"given":"M. Manuela M.","family":"Raposo","sequence":"additional","affiliation":[{"name":"Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7915-4720","authenticated-orcid":false,"given":"Susana P. G.","family":"Costa","sequence":"additional","affiliation":[{"name":"Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,8,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"196","DOI":"10.1016\/j.ccr.2018.07.017","article-title":"A review of recent developments in fluorescent sensors for the selective detection of palladium ions","volume":"376","author":"Balamurugan","year":"2018","journal-title":"Coord. Chem. 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