Novel sodium aluminium borohydride containing the complex anion [Al(BH(4),Cl)(4)](-)
(2011) Faraday Discussions — Vol. 151, n° 1, p. 231-242 (2011)
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- The synthesis of a novel alkali-metal aluminium borohydride NaAl(BH(4))xCl(4-x) from NaBH(4) and AlCl(3) 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 Pmn2(1)) is formed which contains Na(+) cations and complex [Al(BH(4),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.% H(2) in contrast to the expected 14.6 wt.% for chlorine free NaAl(BH(4))(4). The decomposition of NaAl(BH(4))(x)Cl(4-x) is observed in the target range for desorption at about 90 degrees 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 H(2) and B(2)H(6) at about 90 degrees C followed by extensive weight loss in the form of chloride evaporation.
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Lindemann, I., Ferrer, R. D., Dunsch, L., Cerny, R., Hagemann, H., D’Anna, V., Filinchuk, Y., Schultz, L., & Gutfleisch, O. (2011). Novel sodium aluminium borohydride containing the complex anion [Al(BH(4),Cl)(4)](-). Faraday Discussions, 151(1), 231-242. https://doi.org/10.1039/c0fd00024h (Original work published 2011)