Sulfur Tetrafluoride
Title: Sulfur Tetrafluoride
CAS Registry Number: 7783-60-0
Molecular Formula: F4S
Molecular Weight: 108.06
Percent Composition: F 70.33%, S 29.67%
Line Formula: SF4
Literature References: First prepd from cobalt trifluoride and elemental sulfur: Fischer, Jaenckner, Angew. Chem. 42, 810 (1929); Kwasnik in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) pp 168-169. Best prepared from SCl2 and NaF suspended in acetonitrile; also from sulfur, chlorine and sodium fluoride: Tullock et al., J. Am. Chem. Soc. 82, 539 (1960); Arth, Fried, US 3046094 (1962 to Merck & Co.); Fawcett, Tullock, Inorg. Synth. 7, 119 (1963). Reviews of prepn and chemistry: Smith, Angew. Chem. Int. Ed. 1, 467-475 (1962); Kemmitt, Sharp, Adv. Fluorine Chem. 4, 220-222 (1965); Martin, Ann. N.Y. Acad. Sci. 145, 161-168 (1967).
Properties: Colorless gas. Thermostable to 600°. mp -121.0°. bp -38°. d (liq; -78°) 1.95. d (solid; -183°) 2.349. Freely sol in benzene. Violent reaction with water. Hydrofluoric acid released on exposure to moisture. Dec by concd H2SO4. Attacks glass but not quartz or mercury.
Melting point: mp -121.0°
Boiling point: bp -38°
Density: d (liq; -78°) 1.95; d (solid; -183°) 2.349
CAUTION: Potential symptoms of overexposure are irritation of eyes, mucous membranes; direct contact with liquid may cause frostbite; eye and skin burns from released hydrofluoric acid. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 290.
Use: Selective fluorinating agent.

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