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

Published

January 9, 2012

Author(s)

Yong Shen Chua, Hui Wu, Wei Zhou, Terrence J. Udovic, Guotao Wu, Zhitao Xiong, Ming Wah Wong, Ping Chen

Abstract

The monoammoniate of calcium amidoborane, Ca(NH₂BH₃)₂¿NH₃ was synthesized by ball milling an equimolar mixture of CaNH and AB. Its crystal structure has been determined and found to contain a complete dihydrogen-bonded network. Thermal decomposition under an open system begins with the evolution of ≅ 1 equivalent/formula unit (equiv.) of NH₃ at temperatures < 100 °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 ca. 70 °C and 180 °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, ca. 6 equiv. (ca. 10.2 wt. %) of hydrogen can be released, giving rise to the formation of CaB₂N₃H.

Citation

Inorganic Chemistry

Volume

51

Pub Type

Journals

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Keywords

amidoborane, ammonia, ammoniate, calcium amidoborane, hydrogen, hydrogen-storage material, structure, x-ray diffraction, vibrational spectroscopy

Citation

Chua, Y. , Wu, H. , Zhou, W. , Udovic, T. , Wu, G. , Xiong, Z. , Wong, M. and Chen, P. (2012), Monoammoniate of Calcium Amidoborane - Synthesis, Structure and Hydrogen-Storage Properties, Inorganic Chemistry, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909073 (Accessed December 7, 2024)