Xenon derivatives of the highly electronegative O[double bond, length half m-dash]IF 4 O group

Stable oxygen-bonded xenon(II) and xenon(IV) derivatives of the highly electronegatine OIF4O group have been shown to exist in solution by 19 and 129Xe n.m.r. spectroscopy; the solid derivative, cis,cis-Xe(OIF4)2, has also been isolated and characterized, and 129Xe n.m.r. chemical shifts have been used to established the OIF4O group as the most electronegative group known next to fluorine.