8513. Silver Difluoride

Nomenclature

CAS number: 7783-95-1
Argentic fluoride.
AgF2; mol wt 145.87.
Ag 73.95%, F 26.05%.

Description and 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.

Caution

Symptoms due to fluoride. Highly toxic.

Use

In the fluorination of hydrocarbons.