Naked Eye Detection of Carbonate, Hydroxide, and Cyanide Ions with 1,4′‐Diazaflavonium Bromides: A Simple Spectrophotometric Method for Cyanide Determination

Abstract

Anion sensor properties of N‐alkyl‐substituted 1,4′‐diazaflavonium bromides in methanol–water were evaluated by UV–vis spectrometry. Pronounced changes were observed in the absorption spectra of all compounds for only OH−, CO32−, and CN− among F−, Cl−, Br−, I−, OH−, CO32−, NO3−, PO43−, CN−, SO42−, HSO4−, HCO3−, SCN−, NO2−, and P2O72− ions. Two new absorption bands at 385 and 685 nm accompanying the distinct color change for OH−, CO32−, and CN− ions were observed in case of all compounds. The color changes were from pink to blue for CO32− and OH− ions and from pink to purple for CN− ion. Thanks to the distinct color change, the compounds can be used as selective colorimetric anion sensors. Linear changes of absorbance of N‐heptyl‐substituted compound at 385 nm as a function of the ion concentration were used to determine CN− ion in water samples. Detection and quantification limits of the proposed method were 0.94 and 2.82 mg/L, respectively.

Lansoprazole-Based Colorimetric Chemosensor for Efficient Binding and Sensing of Carbonate Ion: Spectroscopy and DFT Studies

“…Some carbonate chemosensors have been developed in recent years due to their rapidity, high sensitivity, and selectivity. However, some of the prepared sensors have much more detection limit to ion detection in high sensitivity, most of these chemosensors are difficult to prepare, or the reactions are not cost-effective (Ghorai et al, 2016b ; Tavallali et al, 2016 , 2019 ; Karuk Elmas et al, 2018 ; Kahriman et al, 2019 ; Naderi et al, 2019 ; Singh et al, 2019 ; Morikawa et al, 2020 ; Velmurugan et al, 2020 ). Herein, we proposed a naked-eye chemosensor, which has some superior as a simple process, biocompatibility, efficiency, side effects on the body, and rapid response time.…”