T. Sekine, K. Inaba
Nov 1, 1984
Citations
0
Influential Citations
3
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The ligand of tris(β-diketonato)iron(III) with acetylacetone (Hacac), trifluoroacetylacetone (Htfa), or 2-thenoyltrifluoroacetone (Htta) in carbon tetrachloride was exchanged with another ligand among these. The rate was measured in order to learn about the reaction mechanism in this medium; one in which no intermediates with the solvent molecules were expected. From the dependence of the rate on the particular leaving and entering ligand and from the values of ΔH\eweq and ΔS\eweq, it was concluded that in an exchange involving [Fe(acac)3] there is always a proceeding dissociative mechanism and for [Fe(tta)3] and [Fe(tfa)3] with Hacac there is an interchange mechanism. Exchanges with a fluorinated β-diketone is thought to have a character intermediate to these two mechanisms.