Coordination Compounds of Indium. Part XXVI. Ligand Exchange Studies with Trifluoromethyl-β-diketonato(dimethyl)indium(III) compounds

Abstract

The ligand exchange between Me 2 InL and HL (L = CF 3 .CO.CH.CO.R − anion; R = methyl or t-butyl) has been studied by 19 F n.m.r. spectroscopy, using benzene and di-isobutylketone as solvents. The exchange is first order in both Me 2 InL and HL. Activation free energies were derived from measurements of the coalescence temperature. The results are compared with those of earlier studies. The rate-controlling process in the exchange is identified as the rotation of one monodentate diketonate ligand about a partial double bond prior to intramolecular proton transfer to a second monodentate ligand.