Title: Chromyl Chloride
CAS Registry Number: 14977-61-8
CAS Name: Dichlorodioxochromium
Additional Names: chromium dioxychloride
Molecular Formula: Cl2CrO2
Molecular Weight: 154.90
Percent Composition: Cl 45.78%, Cr 33.57%, O 20.66%
Line Formula: CrO2Cl2
Literature References: Prepn from CrO3 + HCl: Sisler, Inorg. Synth. 2, 205 (1946); Hein, Herzog in Handbook of Preparative Inorganic Chemistry Vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) p 1384; and AlCl3: Flesch, Svec, J. Am. Chem. Soc. 80, 3189 (1958); from Cr2O3 and TiCl4: Braos, Cohen, US 3111380 (1963 to Natl. Distillers & Chem.). Review of chromium halides: Fergusson in Halogen Chemistry Vol. 3, V. Gutmann, Ed. (Academic Press, New York, 1967) pp 227-302.
Properties: Deep red liq; appears black under reflected light. Fumes in moist air. Handle only in well-ventilated hood. mp -96.5°; bp 117°; d425 1.91. Slightly less viscous than water. Nonconductor of electricity. Strong oxidizing agent; can react explosively with combustible organic and inorganic substances. Hydrolyzes vigorously on contact with water. Reacts vigorously with liq or gaseous ammonia. Sol in CCl4, CS2, benzene, nitrobenzene, CHCl3, POCl3. Its soln in CCl4 is fairly stable. Liquid CrO2Cl2 is stable indefinitely in glass, aluminum, stainless steel containers if protected from light and moisture. CrO2Cl2 dissolves CrO3, yielding a powerful oxidant.
Melting point: mp -96.5°
Boiling point: bp 117°
Density: d425 1.91
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin, upper respiratory system; eye, skin burns. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 72.
Use: Catalyst for polymerization of olefins; oxidation of hydrocarbons; in the Etard reaction for production of aldehydes and ketones; in the prepn of various coordination complexes of Cr.