UV–Vis studies of methyl red in the presence of sodium dioctylsulfosuccinate/acetone and sodium dioctylsulfosuccinate/acetone/water

Interaction of Methyl Red with Cetylpyridinium Chloride in Methanol-Water System

“…The azo dye consists of an azo group (-N=N-), which shifts to the hydroazo form during equilibrium in an acidic medium. Hydroazo ions shift to the azo form in basic media [19]; for our alcohol-water system, the appropriate pH range was found to be (5-8), as shown in Figure 7.…”

“…We justify from the literature [16] that MR dye solution in aqueous solution showed red color at the wavelength of maximum absorbance (λmax) 523 nm in acidic (hydrazone) form (pH=2) and yellow color at the wavelength of maximum absorbance (λmax) 431 nm in basic (azo) form (pH=8). In our case, we obtained the pH of azo form due to availability of basic medium of methyl red with CPC and without CPC in methanol mixed media [19]. The only existing form did not allow us to see the isosbestic points in the spectra Figure 1.…”

“…Shahi et al [18] also observed the strong interaction between MR and cationic surfactant dodecyltrimethyl ammonium bromide (DTAB) in the mixed solvent media. Recently Tajpuria et al [19] investigated UV-Vis studies between MR and SDS in acetone/water systems [19]. Thus there are no investigations till now on such interaction between MR and CPC.…”

Synthesis of (E)‐1‐(phenyldiazenyl)cyclohexyl Benzoate from N‐(cyclohexylideneamino)aniline and Benzoyl Peroxide

“…[1] In addition, 2,2-azobis(2-methylpropionitrile) is used as polymerization initiator of monomers such as polyacrylonitrile. [2,3] In addition, there are methyl red [4,5] and methyl orange [6] used as acid-base indicators, New Coccine [7] and Tartrazine [8,9] used as edible pigments, etc (Figure 1).…”