Coordination Compounds of Indium. Part XIX. Ligand Exchange Studies with Indium(III) Complexes of Trifluoromethyl-β-diketonates
- 15 December 1972
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 50 (24) , 3950-3957
- https://doi.org/10.1139/v72-626
Abstract
The ligand exchange reaction between InL3 con plexes (L = CF3•CO•CH•CO•R− anion; R = methyl, i-butyl, phenyl, 2-naphthyl, and 2-thienyl) and excess free ligand (HL) has been studied in the solvents diisopropyl ketone, acetonitrile, benzene, and dimethylsulfoxide. Studies of the lifetimes of the reactants as obtained from their 19F n.m.r. line-widths show that the exchange is first order in InL3 concentration, but zero order in free ligand concentration. The coalescence temperature for the collapse of the n.m.r. 19F chemical shift between free and complexed ligand (~50 Hz) yields ΔG≠ for the exchange. The results are in agreement with the known stereochemical properties of indium(III) complexes. The rate-controlling process in the exchange is identified as the. rotation of one monodentate ligand about a partial double bond prior to intramolecular proton transfer to a second monodentate ligand.Keywords
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