Store it up : The ammoniate, Li(NH 3 )BH 4, has been prepared and fully characterized by Raman and NMR spectroscopy and X‐ray powder diffraction. The potential for its use as an ammonia store and a comparison to other ammonia storage materials is discussed. magnified image Lithium borohydride absorbs anhydrous ammonia to form four stable ammoniates; Li(NH 3 ) n BH 4 , mono‐, di‐, tri‐, and tertraammoniate. This paper focuses on the monoammoniate, Li(NH 3 )BH 4 , which is readily formed on exposure of LiBH 4 to ammonia at room temperature and pressure. Ammonia loss from Li(NH 3 )BH 4 commences around 40 °C and the compound transforms directly to LiBH 4 . The crystal structure of Li(NH 3 )BH 4 is reported here for the first time. Its close structural relationship with LiBH 4 provides a clear insight into the facile nature and mechanism of ammonia uptake and loss. These materials not only represent an excellent high weight‐percent ammonia system but are also potentially important hydrogen stores.
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Johnson et al. (2009) studied this question.
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