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Studies on Thermodynamics of Micellization and Solvophobic Interactions of Novel Surfactant–Cr(III) Complexes in Non-aqueous Solvents

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Abstract

The critical micelle concentration (CMC) of surfactant–Cr(III)–dodecylamine complexes of the type cis-α-[Cr(trien)(C12H25NH2)X]2+ (where trien = triethylenetetramine; X = F−, Cl−, Br−) has been studied in n-alcohol and in formamide at different temperatures, by electrical conductivity measurements. From the CMC values as a function of temperature, various thermodynamic properties have been evaluated: standard Gibbs energy changes (Δmic G 0), standard enthalpy changes (Δmic H 0) and standard entropy changes (Δmic S 0) for micellization. Critical micelle concentrations have also been measured as a function of the percentage composition of alcohol added. The solvent composition dependences of these thermodynamic parameters were determined. It is suggested that alcohol addition leads to an increase in formamide penetration into the micellar interface that depends on the alcohol’s chain length. The results are discussed in terms of an increased hydrophobic effect, dielectric constant of the medium, the chain length of the alcohols, and the surfactant in the solvent mixture.

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Authors and Affiliations

  1. Department of Chemistry, Government Arts College, Tiruchirappalli, 620 022, Tamil Nadu, India

    N. Kumaraguru

  2. Chemistry Division, School of Science and Humanities, VIT University, Vellore, 632 014, Tamil Nadu, India

    K. Santhakumar

  3. Department of Chemistry, Poompuhar College, Melaiyur, 609 107, Tamil Nadu, India

    S. Kalyanasundharam

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  1. N. Kumaraguru
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  2. K. Santhakumar
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  3. S. Kalyanasundharam
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Correspondence to N. Kumaraguru.

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Kumaraguru, N., Santhakumar, K. & Kalyanasundharam, S. Studies on Thermodynamics of Micellization and Solvophobic Interactions of Novel Surfactant–Cr(III) Complexes in Non-aqueous Solvents. J Solution Chem 40, 1673–1686 (2011). https://doi.org/10.1007/s10953-011-9742-y

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