M（硼氢化氨基硼烷）——轻碱金属氨基硼烷热分解机理中缺失的环节

M(BH3NH2BH2NH2BH3)--the missing link in the mechanism of the thermal decomposition of light alkali metal amidoboranes.

作者信息

Fijalkowski K J, Jaroń T, Leszczyński P J, Magos-Palasyuk E, Palasyuk T, Cyrański M K, Grochala W

机构信息

Center of New Technologies, University of Warsaw, ul. Zwirki i Wigury 93, 02-089 Warsaw, Poland.

出版信息

Phys Chem Chem Phys. 2014 Nov 14;16(42):23340-6. doi: 10.1039/c4cp03296a.

DOI:10.1039/c4cp03296a

PMID:25259596

Abstract

We report a novel family of hydrogen-rich materials - alkali metal di(amidoborane)borohydrides, M(BH3NH2BH2NH2BH3). The title compounds are related to metal amidoboranes (amidotrihydroborates) but have higher gravimetric H content. Li salt contains 15.1 wt% H and discharges very pure H2 gas. Differences in thermal stability between amidoboranes and respective oligoamidoboranes explain the release of the ammonia impurity (along with H2) during the thermal decomposition of light alkali amidoboranes, LiNH2BH3, NaNH2BH3 and NaLi(NH2BH3)2, and confirm the mechanism of the side decomposition reaction.

摘要

我们报道了一类新型的富氢材料——碱金属二（氨基硼烷）硼氢化物，M(BH₃NH₂BH₂NH₂BH₃)。标题化合物与金属氨基硼烷（氨基三氢硼酸盐）有关，但具有更高的氢重量含量。锂盐含有15.1 wt%的氢，并释放出非常纯净的氢气。氨基硼烷与相应的低聚氨基硼烷之间热稳定性的差异解释了轻碱氨基硼烷LiNH₂BH₃、NaNH₂BH₃和NaLi(NH₂BH₃)₂热分解过程中氨杂质（与氢气一起）的释放，并证实了副分解反应的机理。