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

A number of mixed ligand cobalt(III)-surfactant coordination complexes of the type cis-[Co(en)(2)(A)X](2+) and cis-alpha-[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 (Delta G(m)(0), Delta H-m(0) and Delta S-m(0)) (C) 2005 Elsevier Ltd. All rights reserved.