The critical micelle concentration (CMC) of four kinds of metallosurfactants of the type halogeno(dodecyl/cetylamine)-bis(ethylenediamine) cobalt(III) has been studied in n-alcohol and in formamide at different temperatures by electrical conductivity method. Specific conductivity data (at 293-313 K) served for the evaluation of temperature-dependent CMC and the thermodynamic parameters such as standard Gibbs free energy changes (ΔGmic0), enthalpies (ΔHmic 0), and entropies (ΔSmic0) of micelle formation. CMCs have also been measured as a function of percentage concentration of alcohol added. It is suggested that alcohol addition leads to increase in formamide penetration into micellar interface that depends on the alcohol chain length. The results have been discussed in terms of increased hydrophobic effect (solvophobic interaction), dielectric constant of the medium, and the chain length of the alcohols, the surfactant in the solvent mixture. © 2006 Wiley Periodicals, Inc.

Santhakumar K

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Arunachalam V

Department of Micro and Nanoelectronics

School of Electronics Engineering

Kumaraguru N

Arumugham M.N.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

International Journal of Chemical Kinetics

Transition Metal Chemistry

Octadecylamine cobalt(III) dimethyl glyoximato complexes: synthesis, thermodynamics of micellization, steady-state photolysis and biological activities

Journal of Solution Chemistry

Micellization of Metallosurfactant N-Dodecyl/Hexadecyl/Octadecyl Salicylaldimine Cobalt(III) Complexes in Nonaqueous Media

Synthesis, structure, CMC values, thermodynamics of micellization, steady-state photolysis and biological activities of hexadecylamine cobalt(III) dimethyl glyoximato complexes

The critical micelle concentration (CMC) of surfactant-Cr(III)-dodecylamine complexes of the type cis-α-[Cr(trien)(C 12H 25NH 2)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 (Δ micG 0), standard enthalpy changes (Δ micH 0) and standard entropy changes (Δ micS 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. © Springer Science+Business Media, LLC 2011.

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

Kinetics of reduction of the surfactant complex ions, cis-chloro/bromo (dodecylamine)bis(ethylenediamine)cobalt(III) by iron(II) in aqueous solution was studied at 303, 308, and 313 K by spectrophotometry method under pseudo-first-order conditions, using an excess of the reductant. The second-order rate constant remains constant below critical micelle concentration (cmc), but increases with cobalt(III) concentration above cmc, and the presence of aggregation of the complex itself alters the reaction rate. The rate of reaction was not affected by the added [H+]. Variation of ionic strength (μ) influences the reaction rate. Activation and thermodynamic parameters have been computed. It is suggested that the reaction of Fe 2+ (aq) with cobalt(III) complex proceeds by the inner-sphere mechanism. © 2005 Wiley Periodicals.

Kinetics of Fe(II) reduction ofcis-halogeno(dodecylamine) bis(ethylenediamine)- cobalt(III) complex ion in aqueous solutions

A number of mixed ligand cobalt(III)-surfactant coordination complexes of the type cis-[Co(en)2(A)X]2+ and cis-α-[Co(trien)(A)X]2+ (A = Dodecyl or Cetylamine, X = Cl-, Br-, NO2) were synthesized from the corresponding dihalogeno complexes by the ligand substitution method. These compounds form a foam in aqueous solution when shaken. The critical micelle concentration (CMC) values of these surfactant metal complexes in aqueous solution were obtained from conductance measurements. Specific conductivity data (at 303, 308 and 313 K) served for the evaluation of the temperature-dependent critical micelle concentration (CMC) and the thermodynamics of micellization ( Δ Gm0, Δ Hm0 and Δ Sm0). © 2005 Elsevier Ltd. All rights reserved.

Polyhedron

Metallomicelles of Co(III) coordination complexes – Synthesis, characterization and determination of CMC values

A number of mixed ligand chromium(III)-surfactant coordination complexes, of the type cis-[Cr(en)2(A)X]2+ and cis-α-[Cr(trien) (A)X]2+ (A = Dodecyl or Cetylamine; X = F-, Cl -, Br-) were synthesized from the corresponding dihalogeno complexes by ligand substitution. These compounds form foam in aqueous solution when shaken. The critical micelle concentration (CMC) values of these surfactant metal complexes in aqueous solution were obtained from conductance measurements. Specific conductivity data (at 303, 308 and 313 K) served for evaluation of the temperature-dependent critical micelle concentration (cmc) and the thermodynamics of micellization (Δ G m 0, Δ H m 0 and Δ S m 0). © Springer 2006.

Fulltext

Metallosurfactants of Chromium(III) Coordination Complexes. Synthesis, Characterization and Determination of CMC Values

Studies on solvophobic interactions and micelle formation of some surface active Cr(III) complexes in non-aqueous solvents

Nano Letters

Ru(II)-Based Metallosurfactant Forming Inverted Aggregates

Thermodynamics and micellar properties of some surface active cobalt(III) metallosurfactants in nonaqueous medium

Journal	Data powered by TypesetInternational Journal of Chemical Kinetics
Publisher	Data powered by TypesetWiley
ISSN	0538-8066
Open Access	No