in not given

hydrogen fluoride in further solvent(s) Cs2NiF6 was suspended in BrF5 at 25°C, frozen at -196°C, AsF5 was added, warmed to 25°C, stirred for 5 min, frozen at -196°C, HF was condensed, stirred at 25°C for 12 h; volatiles were removed in vac. for 12 h at 25°C, suspended in HF at -20°C, N2 was passed through reactor, evapd., washed with HF at -78°C;

in neat (no solvent, solid phase) heating at 230°C for 4 days, 3-fold excess of CsF;

in water centrifugation, recrystn. (H2O);

in further solvent(s) addn. of CsN3 in SO2ClF to (ICNI)AsF6 in SO2ClF, stirring (30 min); filtration, the byproducts being identified by gas-phase IR when the filtrate wa carefully evapd. to dryness;

in hydrogen fluoride dry HF condensed at -196°C onto mixt. of ClF6AsF6 and CsBF4, warmed for 30 min to 25°C with stirring; cooled to -78°C, filtered under N2 (2 atm), volatile at 25°C pumped off for 1.5 h, sepd. by fractional condensation through series of traps kept at -112, -142, and -196°C; IR, Raman anal.;

in sulfur dioxide byproducts: N2; SO2 was condenced onto frozen mixt. of (S3N2)2NAsF6 and CsN3 (molar ratio 200:1:1), warmed to 0°C with stirring, 30 min; filtered, washed with SO2, pumped, CH3CN condenced into vessel, washed with CH3CN; identified by IR spectra;

caesium chloride in liquid sulphur dioxide react. of CsCl and AsF5 in SO2, several d; pptn.; washing; evapn.;

in hydrogen fluoride Cs2NiF6 was placed in trap, suspended at -60°C in ClF5, HF was condensed at -60°C, AsF5 was added, stirred at -60°C, 0.5 h at -60-40°C, 14 h at -60-10°C; volatiles removed in vac. at 25°C, suspended in HF at 25.degre.C,filtered under Ar, cooled to -196°C under vac., stirred with HF at 25°C, filtered at -78°C under Ar, washed with HF at -78 °C, dried in vac. for 12 h;

in not given drying (elevated temp., dynamic vac.);