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.

Arunachalam V

Department of Micro and Nanoelectronics

School of Electronics Engineering

Vellore Campus

Santhakumar K

Department of Chemistry

School of Advanced Sciences

Kumaraguru N

Arumugham M.N

Fulltext

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

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

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 electron-transfer kinetics of the ionic surfactant complex cis-chloro/bromo(cetylamine)bis(ethylenediamine)cobalt(III) by iron(II) in aqueous perchlorate medium at μ=1.0 mol·dm-3 ionic strength have been studied at 303, 308 and 313 K by spectrophotometry under pseudo-first-order conditions using an excess of the reductant. The effects of [H+], ionic strength and [Fe2+] on the rate were determined. The reaction was found to be second order and showed to be independence of the acid concentration in the range [H+]=0.05-0.25 mol·dm-3. The second order rate constant increased with surfactant-cobalt(III) concentration and the occurrence of aggregation of the complex itself altered the reaction rate. Activation and thermodynamic parameters have been computed. It is suggested that the reaction of Fe 2+(aq) with the cobal (III) complex proceeds by an inner-sphere mechanism. The critical micelle concentration (CMC) values of these surfactant-metal complexes were obtained in aqueous solution from conductance measurements. Specific conductivity data (at 303, 308 and 313 K) served for the evaluation of the temperature-dependence of the critical micelle concentration (CMC) and the thermodynamics of micellization (ΔG m o,ΔH m o and ΔS m o ). © 2009 Springer Science+Business Media, LLC.

Studies on the Reaction Kinetics and Mechanism of Iron(II) Reduction of the cis-Halogeno(cetylamine)bis(ethylenediamine)cobalt(III) Complex Ion in Aqueous Perchlorate Medium

Surface active mixed-ligand complexes of Cr(III) containing chelating ligands, namely ethylenediamine (en), triethylenetetramine (trien), 2,2-bipyridine (bpy), and 1,10-phenanthroline (phen) with different axial amine ligands (dodecylamine or cetylamine) were synthesized and characterized by UV-Vis, infrared, and NMR spectroscopies and elemental analysis. The magnetic moments (3.6-3.8 B.M.) are close to the spin-only value for a d3 Cr(III) in octahedral symmetry. The critical micelle concentration values of these surfactant metal complexes in aqueous solution were determined as a function of temperature using conductometric technique. Thermodynamics of micellization (ΔGm0, ΔHm0 and ΔSm0) were evaluated. Dodecyl/cetylamine metallosurfactants obtained were tested for antibacterial and antifungal activities having good activities. © 2009 Taylor &amp; Francis.

Journal of Coordination Chemistry

Synthesis, characterization, critical micelle concentration determination, and antimicrobial studies of some complexes of chromium(III) metallosurfactants

Applied Surfactants

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

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

Journal	Data powered by TypesetTransition Metal Chemistry
Publisher	Data powered by TypesetSpringer Science and Business Media LLC
ISSN	0340-4285
Open Access	No