Sensitive and Selective “Turn-On” Chemodosimetric Probes for Fe3+ Based on a Skeleton of 2-Hydroxy-1-Naphthaldehyde

Abstract

A naked-eye colored chemodosimeteric probes 4a-f, based on Schiff-azo dye conjugates were synthesized and characterized. All compounds 4a-f exhibited excellent selectivity and high sensitivity in absorbance toward detection of Fe in alcoholic solutions under neutral pH conditions. The detection limit of the probe was shown to be up to 0.05 ppm. A simple paper test strip system for the rapid monitoring of Fe was developed, indicating their convenient use in environmental samples. Electrochemical analysis of metal free conjugates and iron chelated probes confirmed the chelation of ligands. Graphical Abstract.

Synthesis and evaluation of novel naphthol diazenyl scaffold based Schiff bases as potential antimicrobial and cytotoxic agents against human colorectal carcinoma cell line (HT-29)

“…The refluxing of the reaction mixture was continued for 7–8 h until the reaction completion was confirmed by TLC. The reaction volume was concentrated to half and kept at 10–15 °C for the precipitation of Schiff bases [37]. The precipitated Schiff bases were collected by filtration, washed with ice-cold ethanol and dried in air.…”

Copolymerization of 4‐vinylsulfonyl aniline with acrylamide and its application as macromolecular dye backbone

“…To achieve a higher fixation of the reactive dyes on the fibers, macromolecule dyes containing multiple reactive groups or chromophores that can react with the fibers have been synthesized 11–13 . It is not difficult to understand that dyes with two or more reactive groups will give a higher fixation yield than dyes with one reactive group 14,15 . As long as one reactive group reacts with the fiber, the whole dye molecule can be linked with the fiber through a covalent bond 16,17 .…”

“…[11][12][13] It is not difficult to understand that dyes with two or more reactive groups will give a higher fixation yield than dyes with one reactive group. 14,15 As long as one reactive group reacts with the fiber, the whole dye molecule can be linked with the fiber through a covalent bond. 16,17 So, macromolecular dyes with multiple reactive groups often have more than 90% fixation.…”

A new way to improve the light-fastness of azo reactive dyes through the introduction of benzene sulfonamide derivatives into the triazine ring

“…Generally, there are two ways to improve the light-fastness of azo dyes: rst, the use of chromophores, such as anthraquinone and metal azo complexes, with high light-fastness, [13][14][15] and second, the incorporation of UV absorbers into the dye molecules or the treatment of textiles with UV absorbers before or aer dyeing. [16][17][18][19][20][21][22] UV absorbers are usually introduced into a dye molecule by linkage with cyanuric chloride, 17 and the latter also acts as a reactive group in a reactive dye.…”