Colorimetric chemosensor for Fe2+ and Fe3+ based on a ternary mixture of an anionic dye, a cationic polyelectrolyte, and a metal chelator in aqueous solution

2020

Coloration Technology

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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.

Section: Introductionmentioning

confidence: 99%

Colorimetric detection of Mn(ii) based on a mixture of an anionic pyridylazo dye and a cationic polyelectrolyte in aqueous solution

Fukushima

2020

Coloration Technology

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“…Cationic PDADMAC can interact with anionic dyes to induce dye aggregate formation, and it has the potential to exhibit new spectroscopic and sensing properties . Our recent studies reported the mixture of an anionic dye and PDADMAC showed a selective colorimetric detection as distinct from the original dye . PDADMAC is one of typical examples of cationic polyelectrolytes.…”

Section: Introductionmentioning

confidence: 99%

“…50,51 Our recent studies reported the mixture of an anionic dye and PDADMAC showed a selective colorimetric detection as distinct from the original dye. [52][53][54][55] PDADMAC is one of typical examples of cationic polyelectrolytes. Among polycations, PDADMAC was chosen due to high water solubility and many positive charges in the wide pH range besides commercial availability.…”

Section: Introductionmentioning

confidence: 99%

Colorimetric chemosensor for Ni²⁺ based on alizarin complexone and a cationic polyelectrolyte in aqueous solution

Inoue

J of Applied Polymer Sci

Fukushima

2019

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A new and convenient chemosensor for detecting Ni2+ in aqueous buffer has been developed by mixing an anionic organic dye, alizarin complexone (ALC) and a cationic polyelectrolyte, poly(diallyldimethylammonium chloride) (PDADMAC). After addition of Ni2+, the chemosensor exhibits a remarkable bathochromic shift with a significant color change from red to blue, while other metal ions did not induce such a change. The color change may be attributed to the aggregate formation of an ALC‐based Ni2+ complex on the surface of PDADMAC. The results showed that the ALC and PDADMAC mixture can be applied to detect Ni2+ selectively with colorimetric changes. This investigation can lead to the construction of new chemosensors by facile and simple mixture of a water‐soluble dye and an oppositely charged polyelectrolyte. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47496.

“…Cationic PDADMAC can interact with anionic dyes to induce dye aggregate formation, and it has the potential to exhibit spectroscopic and sensing properties . Our previous studies reported that a mixture of an anionic dye and PDADMAC showed selective colorimetric detection distinct from the original dye …”

Section: Introductionmentioning

confidence: 99%

“…25,26 Our previous studies reported that a mixture of an anionic dye and PDADMAC showed selective colorimetric detection distinct from the original dye. [27][28][29] In this study, we developed a colorimetric chemosensor for Co 2+ in a pure aqueous solution under physiological pH conditions with a mixture of 5-Br-PAPS and PDADMAC. While 5-Br-PAPS has little selectivity for Co 2+ , the resulting 5-Br-PAPS and PDADMAC mixture displayed a selective and sensitive response to Co 2+ through an obvious color change from yellow to blue.…”

Section: Introductionmentioning

confidence: 99%

Colorimetric Co²⁺ sensor based on an anionic pyridylazo dye and a cationic polyelectrolyte in aqueous solution

Inoue

Sakamaki

et al. 2018

Polymer International

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A new naked‐eye colorimetric sensor for detecting Co2+ in a pure aqueous solution at pH 7.0 was developed by mixing an anionic organic dye, 2‐(5‐bromo‐2‐pyridylazo)‐5‐(N‐propyl‐N‐sulfopropylamino)phenol (5‐Br‐PAPS) with a cationic polyelectrolyte, poly(diallyldimethylammonium chloride) (PDADMAC). Upon addition of Co2+, the absorption maximum exhibited a remarkable bathochromic shift from 426 to 635 nm (Δ = 209 nm) with a detectable color change from yellow, green to blue, while other metal ions did not induce such a change. The results showed that the 5‐Br‐PAPS and PDADMAC mixture can be used as a selective and sensitive naked‐eye colorimetric chemosensor for Co2+. This study afforded a simple strategy to construct a novel chemosensor by a simple mixture of an organic dye and an oppositely charged polyelectrolyte. © 2018 Society of Chemical Industry