Issue 12, 2016

Solution-based routes to ammine metal borohydrides: formation of ammonia-borane

Abstract

Ammine metal borohydrides (AMBs) have recently commanded attention as low-temperature hydrogen sources. As an alternative to widely used mechanochemical synthesis that affords mixtures with salt co-products, we have been investigating solution synthesis routes to obtain pure AMBs. Here we show that reactions of MCln + nNaBH4 with ammonia in thf afford ammonia-borane (AB) via borane abstraction from M-coordinated borohydride. The amount of AB formed correlates roughly with the metal ion electronegativity and AMB thermal stability, except for reducible metals such as Ti, which affords nearly 3 equiv. of AB per Ti.

Graphical abstract: Solution-based routes to ammine metal borohydrides: formation of ammonia-borane

Supplementary files

Article information

Article type
Communication
Submitted
05 Dec 2015
Accepted
04 Jan 2016
First published
11 Jan 2016

Chem. Commun., 2016,52, 2581-2584

Author version available

Solution-based routes to ammine metal borohydrides: formation of ammonia-borane

M. Mostajeran, D. J. Wolstenholme, C. Frazee, G. S. McGrady and R. T. Baker, Chem. Commun., 2016, 52, 2581 DOI: 10.1039/C5CC10027E

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