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On the preparation and NMR spectroscopic characterization of potassium aluminium tetrahydride KAlH4

Abstract

Potassium aluminium tetrahydride KAlH4 of high phase purity (space group Pnma (62)) was synthesized via a mechanochemical route. The thus obtained material was studied by 27Al and 39K MAS NMR spectroscopy. For both nuclei precise data for the isotropic chemical shift and the quadrupole coupling at T=295 K were derived (27Al: δiso = (107.6 ± 0.2) ppm, CQ = (1.29 ± 0.02) MHz and η = 0.64 ± 0.02; 39K: δiso = (6.1 ± 0.2) ppm, CQ = (0.562 ± 0.005) MHz and η = 0.74 ± 0.02). The straightforward NMR spectroscopic approach applied here should also work for other complex aluminium hydrides and for many other materials containing half-integer nuclei experiencing small to medium-sized quadrupole couplings.

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Publication details

The article was received on 22 Feb 2019, accepted on 14 May 2019 and first published on 17 May 2019


Article type: Paper
DOI: 10.1039/C9CP01059A
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript
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    On the preparation and NMR spectroscopic characterization of potassium aluminium tetrahydride KAlH4

    M. Felderhoff and B. Zibrowius, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP01059A

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