The fluoro(hydrocyano)krypton( II ) cation [HC[triple bond, length half m-dash]N–Kr–F] + ; the first example of a krypton–nitrogen bond

The first example of krypton bonded to an element other than fluorine has been provided by the synthesis of the novel [HCN–Kr–F]+ cation, prepared as its AsF6– salt by low-temperature reaction of HCNH+AsF6– with KrF2 in HF or BrF5 as solvent, and characterized by low-temperature Raman spectroscopy and 1H, 13C, 15N, and 19F n.m.r. spectroscopy.