Abstract
The density functional theory calculated energies of the highest molecular orbital of the [Rh(β-diketonato)(P(OX)3)2] complexes (X=H, CH3, Ph) and calculated activation energies of the oxidative addition reaction [Rh(β-diketonato)(P(OH)3)2]+CH3I relate to the electrochemical oxidation potential of rhodium(I) to rhodium(III) in [Rh(β-diketonato)(P(OPh)3)2]. They also relate to the experimental second order oxidative addition rate constant of the reaction [Rh(β-diketonato)(P(OPh)3)2]+CH3I. The results are in close agreement with the electron-donating and -withdrawing properties of the side groups R and R′ on the β-diketonato ligand (RCOCHCOR′)− as described by the Gordy scale group electronegativities, Hammett meta substituent constants, Lever electronic parameters and the pKa of the free β-diketone.
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