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TitleSynthesis and characterization of methylammonium borohydride
Publication TypeJournal Article
Year of Publication2011
AuthorsGraham, K.R., Bowden M.E., and Kemmitt T.
JournalInorganic Chemistry
Pagination932 - 936
Date Published2011
ISSN00201669 (ISSN)
AbstractA new borohydride, [CH 3NH 3] + [BH4] -, has been synthesized through the metathesis of CH 3NH 3F and NaBH 4 in methylamine. Room-temperature X-ray diffraction studies have shown that [CH 3NH 3] +[BH 4] - adopts a tetragonal unit cell with considerable hydrogen mobility similar to that observed in NH 3BH 3. The kinetics and thermodynamics of hydrogen release have been investigated and were found to follow a similar pathway to that of [NH 4] +[BH 4] -. Decomposition of [CH 3NH 3] +[BH 4] - occurred slowly at room temperature and rapidly at ca.40 °C to form [BH 2-(CH 3NH 2) 2] +[BH 4] -, the methylated analogue of the diammoniate of diborane. The decomposition has been investigated by means of in situ X-ray diffraction and solid state 11 B NMR spectroscopy and occurred in the absence of any detectable intermediates to form crystalline [BH 2(CH 3NH 2) 2] +[BH 4] -. [(CH 3) 2NH 2] +[BH 4] - and [BH 2{(CH 3) 2-NH} 2] +[BH 4] - have also been synthesized through analogous routes, indicating a more general applicability of the synthetic method. © 2011 American Chemical Society.

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