Syntheses and Structures of Xenon Trioxide Alkylnitrile Adducts

The potent oxidizer and highly shock‐sensitive binary noble‐gas oxide XeO3 interacts with CH3CN and CH3CH2CN to form O3XeNCCH3, O3Xe(NCCH3)2, O3XeNCCH2CH3, and O3Xe(NCCH2CH3)2. Their low‐temperature single‐crystal X‐ray structures show that the xenon atoms are consistently coordinated to three donor atoms, which results in pseudo‐octahedral environments around the xenon atoms. The adduct series provides the first examples of a neutral xenon oxide bound to nitrogen bases. Raman frequency shifts and Xe−N bond lengths are consistent with complex formation. Energy‐minimized gas‐phase geometries and vibrational frequencies were obtained for the model compounds O3Xe(NCCH3)n (n=1–3) and O3Xe(NCCH3)n⋅[O3Xe(NCCH3)2]2 (n=1, 2). Natural bond orbital (NBO), quantum theory of atoms in molecules (QTAIM), electron localization function (ELF), and molecular electrostatic potential surface (MEPS) analyses were carried out to further probe the nature of the bonding in these adducts. Xenontrioxid bildet stabile 1:1‐ und 1:2‐Addukte mit CH3CN und CH3CH2CN, die durch Raman‐Spektroskopie und Röntgenbeugung charakterisiert wurden. Berechnungen zeigen, dass die Xe‐ ‐ ‐N‐Wechselwirkungen hauptsächlich elektrostatisch sind. Die amphoteren Lewis‐Säure/Base‐Eigenschaften von XeO3 beeinflussen die Geometrien der Addukte im Festkörper, wo die Struktureinheiten über Xe=O‐ ‐ ‐Xe‐Brücken wechselwirken.