The fluoro(perfluoroalkylnitrile)noble-gas( II ) cations, R F C[triple bond, length half m-dash]N–NgF + (Ng = Kr or Xe; R F = CF 3 , C 2 F 5 , n-C 3 F 7 ), and the fluoro(trifluoro-s-triazine)xenon( II ) cation, s-C 3 F 3 N 2 N–XeF + ; novel noble gas–nitrogen bonds

Three novel examples of Kr–N bonds derived from perfluoroalkylnitriles, the RFCN–KrF+ cations, and their xenon analogues RFCN–XeF+(RF= CF3, C2F5, n-C3F7), have been prepared and characterized in BrF5 solvent by 19F and 129Xe n.m.r. spectroscopy; the Xe–N bonded cation s-C3F3N2N–XeF+, synthesized as the AsF6– salt, is stable at room temperature and has been fully characterized by 129Xe and 19F n.m.r. and Raman spectroscopy.