Selenium Hexafluoride
Title: Selenium Hexafluoride
CAS Registry Number: 7783-79-1
Molecular Formula: F6Se
Molecular Weight: 192.95
Percent Composition: F 59.08%, Se 40.92%
Line Formula: SeF6
Literature 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°). Insol in water. Reacts with ammonia gas at 200° to give selenium, nitrogen, and hydrogen fluoride. Covalently satd, does not attack glass.
Melting point: mp -50.8°
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.

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