Title: Silver Difluoride
CAS Registry Number: 7783-95-1
Additional Names: Argentic fluoride
Molecular Formula: AgF2
Molecular Weight: 145.87
Percent Composition: Ag 73.95%, F 26.05%
Literature References: Prepd by the action of fluorine on silver: Ebert et al., J. Am. Chem. Soc. 55, 3056 (1933); by the interaction of fluorine and silver halides: Ruff, Giese, Z. Anorg. Allg. Chem. 219, 143 (1934); v. Wartenberg, ibid. 242, 406 (1939); Struve et al., Ind. Eng. Chem. 39, 353 (1947). Laboratory procedure according to the equation 2AgCl + 2F2 ® 2AgF2 + Cl2: Priest, Swinehart, Inorg. Synth. 3, 176 (1950); Kwasnik in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) pp 241-242. Prepd from silver chloride and chlorine trifluoride: Rochow, Kukin, J. Am. Chem. Soc. 74, 1615 (1952).
Properties: White when pure. Usually obtained as a gray-black or brownish, amorphous solid showing a yellow bloom. Sensitive to light. d 4.7. mp 690°. Very hygroscopic, is converted to a greasy black mass on exposure to atmospheric moisture. Violent reaction with water (instant hydrolytic cleavage). Powerful oxidizing agent giving off some ozone when treated with dil acids. Liberates iodine from iodides. May be stored in quartz or iron ampuls.
Melting point: mp 690°
Density: d 4.7
CAUTION: Symptoms due to fluoride. Highly toxic.
Use: In the fluorination of hydrocarbons. |