Substitution and Isomerization of Asymmetric β-Diketonato Rhodium(I) Complexes: A Crystallographic and Computational Study
作者:Kathrin H. Hopmann、Nomampondomise F. Stuurman、Alfred Muller、Jeanet Conradie
DOI:10.1021/om1000138
日期:2010.6.14
Ligand substitution of PPh3 for CO in the asymmetric square-planar beta-diketonato complex [Rh(PhCOCHCOCH2CH3)(CO)(2)] leads to formation of the monosubstituted [Rh(PhCOCHCOCH2CH3)(CO)(PPh3)] product. Two geometrical product isomers are possible, which unexpectedly crystallize in the same crystal lattice. DFT calculations of the substitution reaction support a twostep mechanism, involving temporary dissociation of a beta-diketonato ligand and formation of a square-planar intermediate. Analysis of the mechanisms involved in product isomerization suggests several noncatalyzed and solvent-assisted interconversion pathways.