Amine-borane σ-complexes Of Rhodium. Relevance To The Catalytic Dehydrogenation Of Amine-boranes

摘要

Chemical hydrogen storage in amine-boranes (e.g., H_3B·NH_3, 19.6 wt% H) is a possible solution to the transport of hydrogen for future energy requirements due to their high hydrogen content. Although solution and solid-state dehydrogenations have been reported, there is much interest in transition-metal-catalyzed dehydrogenation or hydrolytic reactions due to favorable kinetics and lower reaction temperatures. Catalysts for dehydrogenation include Cp_2Ti derivatives, Re-nitrosyls, Ir-pincer complexes, and Ni-NHC complexes; colloidal-Rh has also been shown to be an active catalyst, for which in situ EXAFS suggests that the active species might actually be smaller Rh_4 and Rh_6 "clusters".