8433. Selenium Hexafluoride

Nomenclature

CAS number: 7783-79-1
F6Se; mol wt 192.95.
F 59.08%, Se 40.92%.
SeF6.

Description and references

Prepd by passing gaseous fluorine over finely divided selenium in a copper vessel: Klemm, Henkel, Z. Anorg. Allg. Chem. 207, 74 (1932); Yost, Claussen, J. Am. Chem. Soc. 55, 885 (1933); Yost, Inorg. Synth. 1, 121 (1939). Review: Kemmitt, Sharp, Adv. Fluorine Chem. 4, 235 (1965).

Properties

Gas. mp -50.8°; sublimes -63.8°. Vapor press. (mm Hg): 651.2 (-48.7°); 213.1 (-64.8°); 30.4 (-87.5°). Poisonous; corrosive. Insol in water. Reacts with ammonia gas at 200° to give selenium, nitrogen, and hydrogen fluoride. Covalently satd, does not attack glass.

Caution

Potential symptoms of overexposure in exptl animals are pulmonary irritation and edema. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 276.

Use

Gaseous electric insulator.