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Alkali metal – yttrium borohydrides: The link between coordination of small and large rare-earth

Brix Ley, Morten
Jensen, Torben R.
Meden, Anton
Published in Journal of solid state chemistry. 2015, vol. 225, p. 231-239
Abstract The system Li–A–Y–BH4 (A=K, Rb, Cs) is found to contain five new compounds and four further ones known from previous work on the homoleptic borohydrides. Crystal structures have been solved and refined from synchrotron X-ray powder diffraction, thermal stability of new compounds have been investigated and ionic conductivity measured for selected samples. Significant coordination flexibility for Y3+ is revealed, which allows the formation of both octahedral frameworks and tetrahedral complex anions with the tetrahydroborate anion BH4 both as a linker and terminal ligand. Bi- and trimetallic cubic double-perovskites c-A3Y(BH4)6 or c-A2LiY(BH4)6 (A=Rb, Cs) form in all the investigated systems, with the exception of the Li–K–Y system. The compounds with the stoichiometry AY(BH4)4 crystallize in all investigated systems with a great variety of structure types which find their analog amongst metal oxides. In-situ formation of a new borohydride – closo-borane is observed during decomposition of all double perovskites.
Keywords BorohydridePowder diffractionPerovskite
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Research group Groupe Cerny
Swiss National Science Foundation: 200020_149218
Autre: SCIEX-Nms 11.036
(ISO format)
SADIKIN, Yolanda et al. Alkali metal – yttrium borohydrides: The link between coordination of small and large rare-earth. In: Journal of solid state chemistry, 2015, vol. 225, p. 231-239. doi: 10.1016/j.jssc.2014.12.018 https://archive-ouverte.unige.ch/unige:48130

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Deposited on : 2015-03-11

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