Hydrogen Elimination in Bulky Calcium Amidoborane Complexes: Isolation of a Calcium Borylamide Complex

摘要

Ammonia-borane (NH3BH3, Scheme 1) is currently receiving enormous attention as a hydrogen storage material. It is neither flammable nor explosive, features an extremely high hydrogen content of 19.6 w %, and, calculated by volume (146 g of H_2/L), far exceeds the storage capacities of liquid hydrogen (70 g/L at 20 K). Despite these advantages, there are also some major drawbacks among which are a relatively high hydrogen release window (120-450 ℃) and the nonreversibility of the dehydrogenation reaction (hitherto only a chemical route for regeneration of BN to NH3BH3 is known).