Amminelithium Amidoborane Li(NH3)NH2BH3: A New Coordination Compound with Favorable Dehydrogenation Characteristics |
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| Authors: | Guanglin Xia Dr Xuebin Yu Prof Yanhui Guo Zhu Wu Prof Chuanzhen Yang Prof Huangkun Liu Prof Shixue Dou Prof |
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| Institution: | 1. Department of Materials Science, Fudan University, Shanghai, 200433 (China);2. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050 (China);3. Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2522 (Australia) |
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| Abstract: | 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 °C crystallizes in the orthorhombic space group Pbca with lattice parameters of a=9.711(4), b=8.7027(5), c=7.1999(1) Å, and V=608.51 Å3. 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 °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 °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. |
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| Keywords: | amidoboranes boranes dehydrogenation hydrides hydrogen storage |
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