Iodine Heptafluoride
Title: Iodine Heptafluoride
CAS Registry Number: 16921-96-3
Molecular Formula: F7I
Molecular Weight: 259.89
Percent Composition: F 51.17%, I 48.83%
Line Formula: IF7
Literature References: Prepd by passing fluorine through liq IF5 at 90°, then heating the vapors to 270°: Ruff, Keim, Z. Anorg. Allg. Chem. 193, 176 (1930); Kwasnik in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) pp 160-161. May also be prepd from fluorine and dried PdI2 or KI to minimize formation of the impurity, IOF5: Bartlett, Levchuk, Proc. Chem. Soc. London 1963, 342; Selig et al., J. Phys. Chem. 71, 2739 (1967). Reviews: Kemmitt, Sharp, Adv. Fluorine Chem. 4, 246-247 (1965); Stein, "Physical and Chemical Properties of Halogen Fluorides" in Halogen Chemistry Vol. 1, V. Gutmann, Ed. (Academic Press, New York, 1967) pp 133-224; Meinert, Z. Chem. 7, 41-57 (1967).
Properties: Colorless gas. Crystals when solid. Moldy, acrid odor. Attacks glass and quartz. d (liq; 6°) 2.8. mp 6.45°. Sublimes at 4.77°. Easily forms a supercooled liquid which boils at +4.5°. Trouton constant 26.4. Water dissolves the gas without violence, some decompn. Readily absorbed by NaOH soln.
Melting point: mp 6.45°
Density: d (liq; 6°) 2.8
CAUTION: Highly irritating to skin, mucous membranes. See also Fluorine.
Use: Fluorinating agent.

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