A Stable Crown Ether Complex with a Noble‐Gas Compound

Crown ethers have been known for over 50 years, but no example of a complex between a noble‐gas compound and a crown ether or another polydentate ligand had previously been reported. Xenon trioxide is shown to react with 15‐crown‐5 to form the kinetically stable (CH2CH2O)5XeO3 adduct, which, in mark...

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Veröffentlicht in:Angewandte Chemie International Edition 2018-09, Vol.57 (38), p.12448-12452
Hauptverfasser: Marczenko, Katherine M., Mercier, Hélène P. A., Schrobilgen, Gary J.
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Sprache:eng
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Zusammenfassung:Crown ethers have been known for over 50 years, but no example of a complex between a noble‐gas compound and a crown ether or another polydentate ligand had previously been reported. Xenon trioxide is shown to react with 15‐crown‐5 to form the kinetically stable (CH2CH2O)5XeO3 adduct, which, in marked contrast with solid XeO3, does not detonate when mechanically shocked. The crystal structure shows that the five oxygen atoms of the crown ether are coordinated to the xenon atom of XeO3. The gas‐phase Wiberg bond valences and indices and the empirical bond valences indicate that the Xe‐ ‐ ‐Ocrown bonds are predominantly electrostatic and are consistent with σ‐hole bonding. Mappings of the electrostatic potential (EP) onto the Hirshfeld surfaces of XeO3 and 15‐crown‐5 in (CH2CH2O)5XeO3 and a detailed examination of the molecular electrostatic potential surface (MEPS) of XeO3 and (CH2CH2O)5 reveal regions of negative EP on the oxygen atoms of (CH2CH2O)5 and regions of high positive EP on the xenon atom, which are also in accordance with σ‐hole interactions. Trigonal pyramidal XeO3 coordinates with 15‐crown‐5 to form a room‐temperature‐stable adduct, which has been structurally characterized by Raman spectroscopy and X‐ray crystallography. Computational studies show that the five Xe‐ ‐ ‐O interactions with 15‐crown‐5 are essentially electrostatic and may be described as σ‐hole bonds.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201806640