Lewis acid behavior of xenon (II) cations and the synthesis and characterization of fluoro- and oxofluoro-xenon anions at the limits of coordination.

By taking advantage of the Lewis acid properties of the XeF+ and KrF+ cations, it has been possible to prepare a diverse range of noble-gas adduct cations; FXeL+, FKrNCH+ and FKrNCRF+ (L  HCN, RCN, RFCN, C5F5N, sC3F3N3). The adduct salts have stabilities which range from explosive at −60 °C for FKrNCH+AsF6− (the first example of a KrN bond), to stable at room temperature for sC3F3N2NXeF+AsF6− and have been characterized by …