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Catalytic impacts of cationic twin headed and tailed gemini surfactants toward study of glycine and ninhydrin in sodium acetate-acetic acid buffer system


Ajaya Bhattarai, Malik Abdul Rub, Mihalj Posa, Bidyut Saha, Dileep Kumar

Source title: 
Journal of Molecular Liquids, 360: 119442, 2022 (ISI)
Academic year of acceptance: 

The current report is concerned with catalytic impacts of cationic twin headed and tailed gemini surfactants (16–6-16, 16–5-16 and 16–4-16 symbolized as GS6, GS5 and GS4, respectively) on study of amino acid glycine (GL) and ninhydrin (N). Impact of geminis on the reaction rate of study was studied in sodium acetate-acetic acid buffer system, spectrophotometrically, under varying kinetic conditions. Investigation confirms that the study is affected much and catalyzed strongly by gemini surfactants over traditional ones having similar architect. Catalytic impact of surfactants on reaction rate was detected too at [surfactant] far lesser than critical micellar concentration (cmc) and rate followed the order at all concentrations (GS4 > GS5 > GS6). The experimental data of rate constant (kψ)-[gemini] have been analyzed in terms of kinetic model of miceller catalysis denoted as pseudo-phase. The detected catalysis is attributed to hydrophobic as well as electrostatic interactions between gemini surfactant molecules and reactive species. Effect of other variables, viz., temperature, pH, [N] and [GL] was also examined on ninhydrin-glycine reaction in the presence of twin headed and tailed geminis. Their obtained role is mentioned and elaborated, systematically, in this manuscript. To record the electrical conductivity of cationic gemini system with and without reactants, a conductivity instrument was used.