99144-67-9Relevant academic research and scientific papers
Stepwise phase transition in the formation of lithium amidoborane
Wu, Chengzhang,Wu, Guotao,Xiong, Zhitao,David, William I. F.,Ryan, Kate R.,Jones, Martin O.,Edwards, Peter P.,Chu, Hailiang,Chen, Ping
, p. 4319 - 4323 (2010)
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 (LiNH2BH3?NH3BH 3) and two allotropes of lithium amidoborane (denoted as α- and β-LiNH2BH3, both of which adopt orthorhombic symmetry) were formed in the process of synthesis. LiNH2BH 3?NH3BH3 is the intermediate of the synthesis and adopts a monoclinic structure that features layered LiNH 2BH3 and NH3BH3 molecules and contains both ionic and dihydrogen bonds. Unlike α-LiNH2BH 3, the units of the β phase have two distinct Li+ and [NH2BH3]- environments. β-LiNH 2BH3 can only be observed in energetic ball milling and transforms to α-LiNH2BH3 upon extended milling. Both allotropes of LiNH2BH3 exhibit similar thermal decomposition behavior, with 10.8 wt % H2 released when heated to 180 °C; in contrast, LiNH2BH3?NH3BH 3 releases approximately 14.3 wt % H2 under the same conditions.
