Isomerization Mechanisms of a Labile Co(II) Octahedral Complex
DOI:
https://doi.org/10.2533/000942906777674769Keywords:
Cobalt(ii), Isomer, Labile, 19f nmr, ParamagneticAbstract
The labile cobalt (II) complex [Co(TUF)2(Pic)2] with 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (TUF) bidentate and 4-methylpyridine (Pic) monodentate ligands was studied by variable temperature (VT) 19F NMR from 184 to 312 K. In contrast to the solid state, all the isomers are present in a CD2Cl2 solution. Thermodynamic parameters (?H° and ?S°) of each isomer with reference to the trans(N)-trans(CF3)-trans isomer were obtained from the fitting of experimental mole fraction values. A kinetics investigation of the isomerization processes was performed by lineshape analysis of the spectra using the Kubo-Sack formalism. The suggested bidentate bond-rupture mechanism involves the breaking of the weakest Co–O bond (closest to the CF3 withdrawing group) with the TUF ligand.Downloads
Published
2006-04-28
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Copyright (c) 2006 Swiss Chemical Society
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
How to Cite
[1]
Chimia 2006, 60, 224, DOI: 10.2533/000942906777674769.