Colorimetric detection of Mn(ii) based on a mixture of an anionic pyridylazo dye and a cationic polyelectrolyte in aqueous solution / Yasumasa Fukushima in COLORATION TECHNOLOGY, Vol. 136, N° 5 (10/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 5 (10/2020) . - p. 450-456 Titre : Colorimetric detection of Mn(ii) based on a mixture of an anionic pyridylazo dye and a cationic polyelectrolyte in aqueous solution Type de document : texte imprimé Auteurs : Yasumasa Fukushima, Auteur ; Shunichi Aikawa, Auteur Année de publication : 2020 Article en page(s) : p. 450-456 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteurs chimiques Colorants organiques Colorimétrie Mélanges (chimie) Polyélectrolytes Solutions aqueuses (chimie) Index. décimale : 667.2 Colorants et pigments Résumé : We have developed a simple and valuable method for the construction of a colorimetric chemosensor for detecting Mn(ii) in aqueous media. The chemosensor was prepared by mixing two commercial products, an anionic organic dye, 2‐(5‐nitro‐2‐pyridylazo)‐5‐(N‐propyl‐N‐sulphopropylamino)phenol (Nitro‐PAPS) and a cationic polyelectrolyte, poly(diallyldimethylammonium chloride) (PDADMAC). Upon gradual addition of Mn(ii) to the chemosensor, the absorption spectra showed a remarkable bathochromic shift concomitantly with a distinct colour change from yellow to blue‐green, while Nitro‐PAPS alone could not detect Mn(ii) in a colorimetric method. PDADMAC played a key role in sensing Mn(ii) for the mixture. The colour change might be due to the formation of the aggregate obtained through electrostatic interactions of a Nitro‐PAPS‐based Mn(ii) complex with PDADMAC. This investigation can inform the development of a new chemosensor by the combination of an anionic dye and a cationic polyelectrolyte. DOI : https://doi.org/10.1111/cote.12489 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12489 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34488 [article]

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Colorimetric sensing of H2PO4- using a Pb2+ complex of a pyridylazo dye in aqueous solution / Mahiro Shimizu in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 544-551 Titre : Colorimetric sensing of H2PO4- using a Pb2+ complex of a pyridylazo dye in aqueous solution Type de document : texte imprimé Auteurs : Mahiro Shimizu, Auteur ; Shunichi Aikawa, Auteur ; Yasumasa Fukushima, Auteur Année de publication : 2023 Article en page(s) : p. 544-551 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteurs chimiques Colorants Colorimétrie Phosphate dihydrogène Le dihydrogène phosphate est un ion inorganique de formule H2PO4. Les phosphates sont largement présents dans les systèmes naturels. (Wikipedia) Produits chimiques -- Détection Solutions aqueuses (chimie) Index. décimale : 547.86 Colorants et pigments Résumé : This study develops a sensitive and selective colorimetric probe for the detection of dihydrogen phosphate (H2PO4-) based on a lead ion (Pb2+) complex of a commercially available pyridylazo dye (PAPS) in aqueous media under physiological conditions. The complex was made by adding Pb2+ to PAPS in a 1:1 stoichiometric ratio (PAPS-Pb2+), which was accompanied by the remarkable solution change from yellow to purple. The colorimetric sensing of H2PO4- over other anions with PAPS-Pb2+ occurred owing to the regeneration of original PAPS by the interaction of H2PO4- with Pb2+ in a 1:2 molar ratio. Moreover, the H2PO4- detection was less affected by the presence of other coexisting competitive anions. The colorimetric naked-eye behaviour of PAPS-Pb2+ rendered a useful and convenient probe for the detection of H2PO4- via the indicator displacement assay. Note de contenu : - Materials and instrumentation - Absorption spectral study - Table 1 : Comparison of various colorimetric chemosensors reported for dihydrogen phosphate (H2PO4) detection - Table 2 : Determination of hydrogen phosphate (HOPO4) in water samples DOI : https://doi.org/10.1111/cote.12671 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12671 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39834 [article]

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