Journal
INORGANIC CHEMISTRY
Volume 49, Issue 9, Pages 4319-4323Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic100308j
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Funding
- Hundred Talents Project and Knowledge Innovation Program of CAS [KGCX2-YW-806, KJCX2-YW-1-121]
- National Program on Key Basic Research Project [201003631304]
- National High-tech R&D Program of China [2009AA05Z108]
- EPSRC
- United Kingdom Sustainable Hydrogen Energy Consortium (UK-SHEC)
- Engineering and Physical Sciences Research Council [EP/F01600X/1, EP/F01595X/1] Funding Source: researchfish
- EPSRC [EP/F01600X/1, EP/F01595X/1] Funding Source: UKRI
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A stepwise phase transition in the formation of lithium amidoborane via the solid-state reaction of lithium hydride and ammonia borane has been identified and investigated Structural analyses reveal that a lithium amidoborane-ammonia borane complex (LiNH(2)BH(3)center dot NH(3)BH(3)) and two allotropes of lithium amidoborane (denoted as alpha- and beta-LiNH(2)BH(3), both of which adopt orthorhombic symmetry) were formed in the process of synthesis LiNH(2)BH(3)center dot NH(3)BH(3) is the intermediate of the synthesis and adopts a monoclinic structure that features layered LINH(2)BH(3) and NH(3)BH(3) molecules and contains both ionic and dihydrogen bonds Unlike alpha-LINH(2)BH(3), the units of the beta phase have two distinct Li(+) and [NH(2)BH(3)](-) environments. beta-LINH(2)BH(3) can only be observed in energetic ball milling and transforms to alpha-LiNH(2)BH(3) upon extended milling. Both allotropes of LiNH(2)BH(3) exhibit similar thermal decomposition behavior, with 10.8 wt % H(2) released when heated to 180 degrees C; in contrast, LINH(2)BH(3)center dot NH(3)BH(3) releases approximately 14.3 wt % H(2) under the same conditions
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