Cerium cyclotrisilazides†
Daniel Werner A and Reiner Anwander
A *
+ Author Affiliations
- Author Affiliations
A Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany.
Australian Journal of Chemistry 75(9) 610-618 https://doi.org/10.1071/CH21312
Submitted: 1 December 2021 Accepted: 12 January 2022 Published: 26 February 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing.
Abstract
The 6-membered 3,5-bis(dimethylsilyl)-2,2,4,4,6,6-hexamethyl-1,3,5,2,4,6-triazatrisilinan-1-ido ligand (dhts) was accessed in the potassium dimer [K(dhts)(thf)]2 (1thf), when treating KH with excess HN(SiHMe2)2 in the presence of THF. 1thf engaged in salt metathesis with CeCl3(thf)1.05 in THF, giving Ce(dhts)3(thf) (2thf). An attempted metathesis reaction in toluene failed, leading only to the recovery of 1thf. Attempts at generating potassium-ate complex {KCe(dhts)4} from salt metathesis between CeCl3(thf)1.05 and four equivalents of 1thf in THF, followed by crystallisation from toluene, resulted in the formation of both 2thf and [K(dhts)(toluene)]2 (1tol). Oxidation of 2thf with trityl chloride led to the isolation of the metastable tetravalent heteroleptic cerium complex Ce(dhts)3Cl (3), characterised by both 1H NMR spectroscopy and X-ray crystallography. Compound 3 is a new addition to a prominent class of cerium(IV) silylamides, and an understudied class of triazatrisilinanides.
Keywords: boat conformation, cerium, crystal structure, cyclosilazane, oxidation, potassium, silylamide, trityl chloride.
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