Interaction of glycine with cationic, anionic, and nonionic surfactants at different temperatures: a volumetric, viscometric, refractive index, conductometric, and fluorescence probe study

Abstract

A number of thermodynamic parameters viz. apparent molar volumes, ϕ v , partial molar volumes, $$ \phi ^{0}_{v} $$ , transfer volumes, $$\phi ^{0}_{v} {\left( {tr} \right)}$$ , Falkenhagen coefficients, A, Jones–Dole coefficients, B, free energies per mole of solute, $$ \Delta \mu ^{{0\# }}_{1} $$ , and per mole of solvent, $$ \Delta \mu ^{{0\# }}_{2} $$ , molar refraction, R D , and limiting molar conductivity, $$ {\mathop \Lambda \limits^0 }_{m} $$ , have been calculated by using the experimentally measured densities, ρ, viscosities, η, refractive indices, n D , and specific conductivities, κ, data of glycine (0.02–0.10 m) in 0.01 m aqueous sodium dodecyl sulphate, cetyltrimethylammonium bromide, and triton X-100 (TX-100) solutions at 298.15, 303.15, 308.15, and 313.15 K. The above calculated parameters were found to be sensitive towards the interactions prevailing in the studied amino acid–surfactant–water systems. Moreover, fluorescence study using pyrene as a photophysical probe has also been carried out, the results of which support the conclusions obtained from other techniques.