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Disorder induced polymorphic transitions in the high hydrogen density compound Sr(BH4)2(NH3BH3)2

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Abstract

The new compound Sr(BH4)2(NH3BH3)2 has been synthesized and characterized with in situ powder X-ray diffraction and fast (28 or 60 kHz) magic angle spinning 1H, 11B and 15N NMR and structurally optimized with density functional theory calculations. This investigation reveals complex structural rearrangements for this compound as a function of temperature. A room temperature orthorhombic polymorph, α-Sr(BH4)2(NH3BH3)2, with the space group symmetry Pbca, has been determined with a layered structure of alternating ammonia borane and Sr(BH4)2, partially stabilized by dihydrogen bonding. Surprisingly the crystal symmetry is lowered upon heating, as evidenced both by in situ synchrotron powder X-ray diffraction and 11B MAS NMR data, resulting in an intermediate polymorph, β′-Sr(BH4)2(NH3BH3)2, present from ∼65 to 115 °C. β-Sr(BH4)2(NH3BH3)2, a sub structure of the β′-polymorph showing higher symmetry with the space group symmetry Aba2, forms upon further heating. Ab initio molecular dynamics simulations show that the ammonia borane molecule can dynamically alternate between a bidentate and a tridentate coordination to Sr at finite temperature. The dynamic properties of the ammonia borane molecule in the solid state are suggested to cause the observed structural complexity. Based on simultaneous thermogravimetric analysis, differential scanning calorimetry and mass spectrometry, the decomposition of the compound was investigated showing a stabilization of ammonia borane in the structure relative to other metal borohydride ammonia boranes and neat ammonia borane.

Graphical abstract: Disorder induced polymorphic transitions in the high hydrogen density compound Sr(BH4)2(NH3BH3)2

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Publication details

The article was received on 10 Sep 2018, accepted on 01 Nov 2018 and first published on 02 Nov 2018


Article type: Paper
DOI: 10.1039/C8DT03654C
Citation: Dalton Trans., 2018, Advance Article
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    Disorder induced polymorphic transitions in the high hydrogen density compound Sr(BH4)2(NH3BH3)2

    M. Jørgensen, Y. Lee, M. Bjerring, L. H. Jepsen, Ü. Akbey, Y. W. Cho and T. R. Jensen, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT03654C

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