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Title

Novel sodium aluminium borohydride containing the complex anion [Al(BH4,Cl)4]−

Authors
Lindemann, Inge
Ferrer, Roger Domènech
Dunsch, Lothar
Schultz, Ludwig
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Published in Faraday Discussions. 2011, vol. 151, p. 231-242
Abstract The synthesis of a novel alkali-metal aluminium borohydride NaAl(BH4)xCl4−x from NaBH4 and AlCl3 using a solid state metathesis reaction is described. Structure determination was carried out using synchrotron powder diffraction data and vibrational spectroscopy. An orthorhombic structure (space group Pmn21) is formed which contains Na+ cations and complex [Al(BH4,Cl)4]−anions. Due to the high chlorine content (1 ≤ x ≤ 1.43) the hydrogen density of the borohydride is only between 2.3 and 3.5 wt.% H2 in contrast to the expected 14.6 wt.% for chlorine free NaAl(BH4)4. The decomposition of NaAl(BH4)xCl4−x is observed in the target range for desorption at about 90 °C by differential scanning calorimetry (DSC), in situ Raman spectroscopy and synchrotron powder X-ray diffraction. Thermogravimetric analysis (TG) shows extensive mass loss indicating the loss of H2 and B2H6 at about 90 °C followed by extensive weight loss in the form of chloride evaporation.
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Research group Groupe Hagemann
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LINDEMANN, Inge et al. Novel sodium aluminium borohydride containing the complex anion [Al(BH4,Cl)4]−. In: Faraday Discussions, 2011, vol. 151, p. 231-242. https://archive-ouverte.unige.ch/unige:16758

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Deposited on : 2011-08-08

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