Preparation of the KrF + , Kr 2 F 3 + , and BrF 6 + ions and their characterisation by 19 F nuclear magnetic resonance and Raman spectroscopy

New adducts of KrF2 with AsF5, SbF5, and PtF5 are shown by 19F n.m.r. and Raman spectroscopy to be the ionic compounds KrF+MF6–(M = As, Sb, or Pt), KrF+Sb2F11–, Kr2F3+MF6–(M = As or Sb), and Kr2F3+MF6–,nKrF2(M = As or Sb); the gross structure of the new cation, Kr2F3+, has been established and appears to be similar to that of Xe2F3+; the new cation, BrF6+, has also been prepared by oxidation of BrF5 with Kr2F3+.