Complexation of Ammonia Boranes with Al 3+

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  • Iurii Dovgaliuk, Université Catholique de Louvain, ID27 Beamline, European Synchrotron Radiation Facility
  • ,
  • Kasper T. Møller, Université Catholique de Louvain
  • ,
  • Koen Robeyns, Université Catholique de Louvain
  • ,
  • Véronique Louppe, Université Catholique de Louvain
  • ,
  • Torben R. Jensen
  • Yaroslav Filinchuk, Université Catholique de Louvain

Ammonia borane, NH 3 BH 3 (AB), is very attractive for hydrogen storage; however, it dehydrogenates exothermally, producing a mixture of polymeric products with limited potential for direct rehydrogenation. Recently, it was shown that AB complexed with Al 3+ in Al(BH 4 ) 3 ·AB endothermically dehydrogenates to a single product identified as Al(BH 4 ) 3 ·NHBH, with the potential for direct rehydrogenation of AB. Here we explore the reactivity of AB-derived RNH 2 BH 3 (R = ?CH 3 , ?CH 2 ?) with AlX 3 salts (X = BH 4 - , Cl - ), aiming to extend the series to different anions and to enlarge the stability window for Al(BH 4 ) 3 ·NRBH. Three novel complexes were identified: Al(BH 4 ) 3 ·CH 3 NH 2 BH 3 having a molecular structure similar to that of Al(BH 4 ) 3 ·AB but different dehydrogenation properties, as well as [Al(CH 3 NH 2 BH 3 ) 2 Cl 2 ][AlCl 4 ] and [Al(NH 2 CH 2 CH 2 NH 2 )(BH 4 ) 2 ][Al(BH 4 ) 4 ], rare examples of Al 3+ making part of the cations and anions simultaneously. The latter compounds are of interest in the design of novel electrolytes for Al-based batteries. The coordination of two ABs to a single Al atom opens a route to materials with higher hydrogen content.

Original languageEnglish
JournalInorganic Chemistry
Volume58
Issue8
Pages (from-to)4753-4760
Number of pages8
ISSN0020-1669
DOIs
Publication statusPublished - 2019

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