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

Lindemann, Inge; Ferrer, Roger Domènech; Dunsch, Lothar; Cerny, Radovan; Hagemann, Hans-Rudolf; D'Anna, Vincenza; Filinchuk, Yaroslav; Schultz, Ludwig; Gutfleisch, Oliver

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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 Cerny, Radovan Hagemann, Hans-Rudolf D'Anna, Vincenza Filinchuk, Yaroslav Schultz, Ludwig Gutfleisch, Oliver show all authors [1 - 9]
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.
Identifiers		DOI: 10.1039/c0fd00024h
Full text		Article (Published version) (623 Kb) - Limited access to UNIGE Other version: http://xlink.rsc.org/?DOI=c0fd00024h
Structures		Faculté des sciences / Section de chimie et biochimie / Département de chimie physique
Research group		Groupe Hagemann
Citation (ISO format)		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