Monoammoniate of Calcium Amidoborane: Synthesis, Structure, and Hydrogen-Storage Properties

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• 作者：Yong Shen Chua ; Hui Wu ; Wei Zhou ; Terrence J. Udovic ; Guotao Wu ; Zhitao Xiong ; Ming Wah Wong ; Ping Chen
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：February 6, 2012
• 年：2012
• 卷：51
• 期：3
• 页码：1599-1603
• 全文大小：297K
• 年卷期：v.51,no.3(February 6, 2012)
• ISSN：1520-510X

文摘

The monoammoniate of calcium amidoborane, Ca(NH₂BH₃)₂路NH₃, was synthesized by ball milling an equimolar mixture of CaNH and AB. Its crystal structure has been determined and was found to contain a dihydrogen-bonded network. Thermal decomposition under an open-system begins with the evolution of about 1 equivalent/formula unit (equiv.) of NH₃ at temperatures <100 掳C followed by the decomposition of Ca(NH₂BH₃)₂ to release hydrogen. In a closed-system thermal decomposition process, hydrogen is liberated in two stages, at about 70 and 180 掳C, with the first stage corresponding to an exothermic process. It has been found that the presence of the coordinated NH₃ has induced the dehydrogenation to occur at low temperature. At the end of the dehydrogenation, about 6 equiv. ( 10.2 wt %) of hydrogen can be released, giving rise to the formation of CaB₂N₃H.