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.

Santhakumar K

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Kumaraguru N

Arumugham M.N

Arunachalam S.

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

Polyhedron

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

The surfactant-Co(III) complexes of the type cis-[Co(en)2AX]2+ (A=Tetradecylamine, X=Cl,Br) were synthesised from corresponding dihalogeno complexes by the ligand substitution method. The critical micelle concentration (CMC) values of these surfactant complexes in aqueous solution were obtained from conductance measurements. The kinetics and mechanism of iron(II) reduction of surfactant-Co(III) complexes, cis-[Co(en)2(C14H29NH2)Cl](ClO4)2 and cis-[Co(en)2(C14H29NH2)Br] (ClO4)2 ions were studied spectrophotometrically in an aqueous acid medium by following the disappearance of Co(III) using an excess of the reductant under pseudo-first-order conditions: [Fe(II)]=0.25moldm -3, [H+]=0.1moldm -3, [μ]=1.0moldm -3 ionic strength in a nitrogen atmosphere at 303, 308 and 313K. The reaction was found to be of second order and showed acid independence in the range [H+]=0.05-0.25moldm -3. The second-order rate constant increased with surfactant-Co(III) concentration and the presence of aggregation of the complex itself altered the reaction rate. The effects of [Fe(II)], [H+] and [μ] on the rate were determined. Activation and thermodynamic parameters were computed. It is suggested that the reaction of [Fe(II)] with Co(III) complex proceeds by an inner-sphere mechanism. © 2010 Taylor &amp; Francis.

Physics and Chemistry of Liquids

Studies on synthesis, determination of CMC values, kinetics and the mechanism of iron(II) reduction of surfactant–Co(III)–ethylenediamine complexes in aqueous acid medium

Coordination Chemistry Reviews

Electrochemical studies of the Co(III)/Co(II)(dbbip)2 redox couple as a mediator for dye-sensitized nanocrystalline solar cells

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Metallomicelles made of dinuclear copper(II) complexes of oxamido-bridge as symmetric two-center catalysts of the cleavage of carboxylic acid esters

Colloid and Polymer Science

Micellar properties of octyldimethylbenzylammonium bromide in water

Langmuir

A Surfactant Transition Metal Chelate

Dalton Transactions

Surface-active cobalt cage complexes: synthesis, surface chemistry, biological activity, and redox properties

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

Journal	Data powered by TypesetPolyhedron
Publisher	Data powered by TypesetElsevier BV
ISSN	0277-5387
Open Access	No