The fluorine ligands of xenon difluoride may be substituted, one at a time, by other electronegative species. Interaction of the difluoride with the appropriate molar quantity of anhydrous acid, below 0°, yields. the monofluorosulfate, FXeOS0 2 F, which is a colorless solid, m.p. 36.6°, the bis-fluorosulfate, Xe(OS0 2 F) 2 , whichis a pale yellow solid, m.p. 43-450, ~he mon8perchlorate, FXeOClOg' which is a colorless solid, m.p. 16.5° and a yellow solid, which decomposes belo-v1 0°, which is probably the bisperchlorate, Xe(OCl0 3) 2. All of these xenon difluoride derivatives are thermodynamically unstable and dismutate spontaneously above 0°, the • .
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