Abstract
Unsymmetrical tridentate ligands can form meridional optical isomers in octahedral complexes. Micellar electrokinetic chromatography with sodium taurochenodeoxycholate or glycochenodeoxycholate micelles is used to separate the enantiomers of bis(8-((pyridine-2-methylene)amino)quinoline)iron(II) hexafluorophosphate, Fe(PMAQ)2(PF6)2, and it is used to follow the temperature dependence of the racemization of the isolated enantiomers. The racemization is studied over a 20° temperature range (60–80°C), and at four different pH values (3.0, 4.45, 7.0, 9.0). Energies and entropies of activation are reported. There is no significant change in the energy of activation as a function of pH. Simple capillary electrophoretic instrumentation with manual, electrokinetic injection, and ambient run temperature conditions provides reliable kinetic data. Half-lives range from 28 to 640 min. A mechanism involving a trigonal prism transition state is proposed for this racemization process. © 2000 John Wiley & Sons, Inc. J Micro Sep 12: 391–397, 2000
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