Synthesis, Characterization, and Polymorphism of [H3O][NbF6]: A Polar and Possibly Ferroelectric Oxonium Salt
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2024-05-22
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Mcode
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Language
en
Pages
15
Series
European Journal of Inorganic Chemistry, Volume 27, issue 15
Abstract
[H3O][NbF6] was obtained from the controlled hydrolysis of NbF5 in anhydrous liquid HF. It adopts a polar, orthorhombic crystal structure with space group Iba2 (no. 45, oI88) at room temperature. A first-order phase transition at 137 K leads to a cubic non-centrosymmetric polymorph in space group I213 (no. 199, cI88). This low-temperature modification results from a distinct rotation of the [H3O]+ cations canceling their polar orientation in the room temperature phase. Quantum-chemical calculations estimate a rotational barrier between 5.8 to 6.4 kJ/mol. At a temperature of 363 K, the compound adopts a centrosymmetric, cubic crystal structure in space group Pm (Formula presented.) m (no. 221, cP11) that shows rotational disorder of cations and anions. The transition from the polar phase at room temperature to the centrosymmetric phase at high temperature not only reveals the plastic nature of the high-temperature structure but also hints at potential ferroelectric properties, underscoring the multifaceted behavior of [H3O][NbF6] across different temperature regimes.Description
Publisher Copyright: © 2024 The Authors. European Journal of Inorganic Chemistry published by Wiley-VCH GmbH.
Keywords
crystal structures, fluoride, niobium, Oxonium, polymorphism, quantum-chemical calculations
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Citation
Möbs, M, Sachs, M, Rolheiser, K, Pietzonka, C, Karttunen, A J & Kraus, F 2024, ' Synthesis, Characterization, and Polymorphism of [H 3 O][NbF 6 ]: A Polar and Possibly Ferroelectric Oxonium Salt ', European Journal of Inorganic Chemistry, vol. 27, no. 15, e202400015 . https://doi.org/10.1002/ejic.202400015
