Synthesis and characterization of geminis and implications of their micellar solution on ninhydrin and metal amino acid complex

Abstract

In our study, three gemini dicationic surfactants with different methylene group spacer (16-6-16, 16-5-16 and 16-4-16) have been synthesized and characterized in solution by 1 H NMR spectroscopic technique. The implications of gemini micellar solution on ninhydrin and metal amino acid complex ([Cu(II)-Trp] + ) were performed by the means of single-beam UV–visible spectroscopy. The absorbance was noted at regular time intervals and values of rate constant ( k ψ ) were determined by using a computer-based program. Synthesized surfactants proved as an efficient catalyst on the interaction of ninhydrin with metal amino acid complex as compared with conventional surfactant and aqueous systems. The required description regarding the implications of gemini dicationic surfactants are provided in the text in detail. The conductivity technique was applied in order to get critical micelle concentration (cmc) of geminis in the presence and absence of reactants. Catalytic results developed in gemini dicationic surfactant system were explained effectively by pseudo-phase model. Various thermodynamic quantities, viz ., activation energy, E a , activation enthalpy, Δ H # , and activation entropy, Δ S # , were obtained on interaction of ninhydrin with [Cu(II)-Trp] + in gemini systems by applying Eyring equation. A detailed explanation about these evaluated parameters was also made.

Influence of twin-headed gemini micellar system on the study of methionine amino acid with ninhydrin in buffer solution

“…This intermediate is not stable and generates 2-aminoindanedione (B) upon hydrolysis. The second step reacts B with a second molecule of ninhydrin and produces Ruhemann's purple (DYDA) as the final purple-coloured product [68–72].

Scheme 1Mechanism of interaction of methionine amino acid with ninhydrin.

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Effects of various media on micellization, adsorption and thermodynamic behaviour of imipramine hydrochloride and antimicrobial surfactant mixtures

“…Recently, the solubilization outcomes of surfactants in micelles have been extensively studied [6]. Micelles are also excellent catalysts [14][15][16][17][18].…”

Spectroscopic and Conductometric Analyses of Ninhydrin and Threonine Reaction in Double-Headed Geminis

“…Excellent performances over traditional surfactants in applications have allowed gemini surfactants to become a research subject of hot spot. Owing to their unique molecular character and properties, geminis are employed in different aspects of applications such as cleaning agents, therapeutic reagents, emulsifiers, catalytic agents, stabilizers, and others. − However, properties of geminis are considerably affected by the nature of spacer chain length.…”