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Lokale Lithiumfluktuationen mit niedriger Aktivierungsenergie in zwei Festkörperphasen des Lithiumsilylamids [(Me~2~SiN t BuLi)~2~O]~2~ by Michael Veith; Michael Zimmer; Volker Huch is a Chemistry article available to read on EtoBox.

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## Abstract Local Lithium Fluctuations with low Activation Energies in two solid Phases of the Lithiumsilylamide [(Me~2~SiN__t__BuLi)~2~O]~2~ The dilithium silylamide [(Me~2~SiN__t__BuLi)~2~O]~2~ shows in the temperature range between ambient temperature and 150 K three solid state phases with transition points at 253 K and 163 K which were characterised by means of X‐ray diffraction andsolid state NMR spectroscopy. In the high temperature phase the dimeric molecules of [(Me~2~SiN__t__BuLi)~2~O]~2~ crystallize in the tetragonal space group __P__4~2~/__nmc__. It can be deducted from X‐ray diffraction studies that, at room temperature, the four lithium atoms in [(Me~2~SiN__t__BuLi)~2~O]~2~ are statistically distributed on two split positions at a distance of 0.89(1) Å. By cooling below 253 K the crystal transforms into an intermediate phase with space group __P__4~2~/__n__. The symmetry of the molecule ist reduced from point symmetry 2__m__ (__D__~2__d__~) to (__S__~4~). The split positions of the lithium atoms are found in different planes and their distance is slightly reduced from0.89 Å to 0.81 Å. Solid state NMR spectroscopic measurements and powder diffraction analysis reveal t

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Author

Michael Veith; Michael Zimmer; Volker Huch

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley - V C H Verlag GmbbH & Co.; Wiley (ISSN 0372-7874)

Published

2009

Language

DE

Field

Chemistry (Physical Sciences)