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

Abstract

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.

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

“… 22,23 PDADMAC causes the aggregation of an anionic dye by electrostatic interactions between them PDADMAC and an anionic dye, and consequently the dye has the potential to exhibit a new colorimetric response and sensing properties 24,25 . Our previous reports stated that the combination of an anionic dye and PDADMAC had sensing properties which were different to the original anionic dye 26‐32 …”