The fluoro(perfluoropyridine)xenon(II) cations, C5F5N–XeF+ and 4-CF3C5F4N–XeF+; novel examples of xenon as an aromatic substituent and of xenon–nitrogen bonding

Abstract

The fluoro(perfluoropyridine)xenon(II) cations, 4-RC₅F₄N–XeF⁺(R = F or CF₃), have been observed in HF and BrF₅ solutions (stable up to –30°C) and their AsF₆^– salts have been isolated from BrF₅ solutions; low temperature Raman and ¹²⁹Xe, ¹⁹F, and ¹⁴N n.m.r. spectroscopic results are consistent with planar cations in which the xenon atom is co-ordinated to the aromatic ring through the lone pair of electrons on the nitrogen.