82456-48-2Relevant academic research and scientific papers
Solution structures and dynamics of complexes of H2Os3(CO)10 with Lewis bases
Keister, Jerome B.,Shapley, John R.
, p. 3304 - 3310 (2008/10/08)
The unsaturated cluster H2Os3(CO)10 reacts with a variety of Lewis bases L, including carbon monoxide, phosphines, phosphites, arsines, stibines, amines, nitriles, isocyanides, halides, and pseudohalides, to form 1:1 adducts H2Os3(CO)10L. Each of these adducts has been shown to contain one axial, terminal hydride ligand and one bridging hydride ligand. Variable-temperature 1H and 13C NMR studies reveal that the two hydride ligands and two carbonyl ligands undergo simultaneous fluxional exchange. A turnstile-like mechanism is proposed. Variation of the free energy of activation for the exchange process with the steric and electronic properties of L suggests that the transition state involves two equivalent hydride ligands bridging the same metal-metal vector.
