Mild dehydrogenation of ammonia borane complexed with aluminum borohydride
(2015) Chemistry of Materials — Vol. 25, n° 7, p. 768-777 (2015)
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Devillers, Michel 
- Abstract
- Ammonia borane is a promising hydrogen store. However, its dehydrogenation is stepwise, nonreversible, and accompanied by formation of undesirable byproducts. We report on a new Al(BH<inf>4</inf>)<inf>3</inf>·NH<inf>3</inf>BH<inf>3</inf> complex containing 17.7 wt % hydrogen, which undergoes a two-step thermal decomposition below 100 °C. The combination of volumetric, gravimetric, crystallographic, and nuclear magnetic resonance studies shows that both in the solid state and in toluene solutions, the Al-coordinated NH<inf>3</inf>BH<inf>3</inf> already releases two H<inf>2</inf> molecules per Al at 70 °C. Contrary to that of the pristine ammonia borane, this process is endothermic, suggesting a possibility for direct rehydrogenation. The dehydrogenation of Al(BH<inf>4</inf>)<inf>3</inf>·NH<inf>3</inf>BH<inf>3</inf> contrasts with the complete destruction of alkali and alkaline earth metal borohydride complexes with ammonia borane in the first decomposition step. Other Al-based Lewis acids, less challenging with respect to the stability and safety than Al(BH<inf>4</inf>)<inf>3</inf>, may be good agents for supporting the reversible dehydrogenation of NH<inf>3</inf>BH<inf>3</inf> under mild conditions. © 2015 American Chemical Society.
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Dovgaliuk, I., Le Duff, C. S., Robeyns, K., Devillers, M., & Filinchuk, Y. (2015). Mild dehydrogenation of ammonia borane complexed with aluminum borohydride. Chemistry of Materials, 25(7), 768-777. https://doi.org/10.1021/cm503601h (Original work published 2015)