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.

Santhakumar K

Department of Chemistry

School of Advanced Sciences

Vellore Campus

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

Journal of Coordination Chemistry

Micelle formation of some surface active mixed-ligand cobalt(III) complexes containing one of the chelating ligands ethylenediamine (en), triethylenetetramine (trien), 2,2 bipyridyl (bpy) or 1,10 phenanthroline (phen) as equatorial and with different axial amine ligands (dodecylamine or cetylamine) were synthesized and characterized by IR, NMR, UV-visible electronic absorption spectra and elemental analysis. 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 CMC and the thermodynamics of micellization (Δ Gm0, Δ Hm0 and Δ Sm0). © 2006 Elsevier Ltd. All rights reserved.

Polyhedron

Synthesis, characterization and micellization behaviour of some surface active mixed-ligand complexes of cobalt(III)

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.

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

Transition Metal Chemistry

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

The kinetics and mechanism of reduction of the surfactant complex ions, cis-chloro/bromo(dodecylamine)(triethylenetetramine)cobalt(III) by iron(II) in aqueous solution were studied at 303, 308 and 313 K by spectrophotometry under pseudo-first-order conditions using an excess of the reductant. The second-order rate constant increases with cobalt(III) concentration and the presence of aggregation of the complex itself alters the reaction rate. The reductions are acid-independent in the range [H+] = 0.05-0.25mol dm-3. Variation of ionic strength (μ) influences the reaction rate. Activation and thermodynamic parameters have been computed. It is suggested that the reaction of Fe2+(aq) with the cobalt(III) complex proceeds by an inner-sphere mechanism. 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 CMC and the standard Gibbs energy of micellization (ΔG m 0 ). © Springer 2006.

Journal	Journal of Coordination Chemistry
Publisher	Informa UK Limited
ISSN	0095-8972
Open Access	No