69546-72-1Relevant academic research and scientific papers
Ligand redistribution reactions of five-coordinate d6 species: RuHX(CO)P2, IrH2XP2, and Cp*RuXP
Poulton, Jason T.,Hauger, Bryan E.,Kuhlman, Roger L.,Caulton, Kenneth G.
, p. 3325 - 3330 (2008/10/08)
For the species RuHXP2(CO), IrH2XP2, and Cp*RuXP (P = bulky phosphine, X = halide or pseudohalide), both homometallic halide exchange ([M]XP + [M]YP′ ? [M]YP + [M]XP′) and heterometallic halide exchange ([M]X + [M]′Y ? [M]Y + [M]′X) are found to be quite rapid. In addition, hydride exchange occurs for RuHCl(CO)P2 and RuDCl(CO)P′2, as well as for IrH2Cl(PtBu2Ph)2 and IrD2Cl(PtBu2Me)2. Exchange is generally faster for halides than for hydrides yet is much slower for the groups phenoxide, OSiPh3, and C2Ph. These equilibria favor the better donating halide being bonded to the less electron-rich metal center. A variable-temperature 1H NMR study of the degenerate exchange Cp*Ru(PtBu2Me)Cl + Cp*Ru′(PtBu2Me)Br ? Cp*Ru(PtBu2Me)Br + Cp*Ru′(PtBu2Me)Cl establishes a second-order rate law with ΔH≠ = 8.6 ± 0.8 kcal/mol and ΔS≠ = -20 ± 3 cal/(mol K). These results clearly indicate the transient existence in solution of halide- and/or hydride-bridged dimers of monomeric metal complexes.
