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首页> 外文期刊>Chemistry: A European journal >Amminelithium Amidoborane Li(NH3)NH2BH3: A New Coordination Compound with Favorable Dehydrogenation Characteristics
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Amminelithium Amidoborane Li(NH3)NH2BH3: A New Coordination Compound with Favorable Dehydrogenation Characteristics

机译：氨基硼烷氨基锂Li（NH3）NH2BH3：具有良好脱氢特性的新型配位化合物

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摘要

The monoammoniate of lithium amidoborane. Li(NH3)NH2BH3, was synthesized by treatment of LiNH2BH3 with ammonia at room temperature. This compound exists in the amorphous state at room temperature, but at -20 degrees C crystallizes in the orthorhombic space group Pbca with lattice parameters of a=9.711(4), b=8.7027(5), c=7.1999(1) angstrom, and V=608.51 angstrom(3). The thermal decomposition behavior of this compound under argon and under ammonia was investigated. Through a series of experiments we have demonstrated that Li(NH3)NH2BH3 is able to absorb/desorb ammonia reversibly at room temperature. In the temperature range of 40-70 degrees C, this compound showed favorable dehydrogenation characteristics. Specifically, under ammonia this material was able to release 3.0 equiv hydrogen (11.18 wt %) rapidly at 60 degrees C, which represents a significant advantage over LiNH2BH3. It has been found that the formation of the coordination bond between ammonia and Li+ in LiNH2BH3 plays a crucial role in promoting the combination of hydridic B-H bonds and protic N-H bonds, leading to dehydrogenation at low temperature.
机译：氨基硼烷锂的单铵盐。通过在室温下用氨处理LiNH2BH3来合成Li（NH3）NH2BH3。该化合物在室温下以非晶态存在，但在-20度下在正交晶空间群Pbca中结晶，晶格参数为a = 9.711（4），b = 8.7027（5），c = 7.1999（1）埃，和V = 608.51埃（3）。研究了该化合物在氩气和氨气下的热分解行为。通过一系列实验，我们证明了Li（NH3）NH2BH3在室温下能够可逆地吸收/解吸氨。在40-70℃的温度范围内，该化合物显示出有利的脱氢特性。具体而言，在氨气下，该材料能够在60摄氏度下快速释放3.0当量的氢（11.18重量％），这代表了优于LiNH2BH3的显着优势。已经发现，LiNH 2 BH 3中氨和Li +之间的配位键的形成在促进氢化的B-H键和质子的N-H键的组合中起关键作用，从而导致低温下的脱氢。

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