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

Abstract

The ligand exchange between Me2InL and HL (L = CF3.CO.CH.CO.R− anion; R = methyl or t-butyl) has been studied by 19F n.m.r. spectroscopy, using benzene and di-isobutylketone as solvents. The exchange is first order in both Me2InL 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.