Title: Chromic Chloride
CAS Registry Number: 10025-73-7
Molecular Formula: Cl3Cr
Molecular Weight: 158.36
Percent Composition: Cl 67.16%, Cr 32.83%
Line Formula: CrCl3
Literature References: Prepn: Heisig et al., Inorg. Synth. 2, 193 (1946); Pray, ibid. 5, 153 (1953); Vavoulis et al., ibid. 6, 129 (1960); Hein, Herzog in Handbook of Preparative Inorganic Chemistry vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) pp 1338-1340; prepn of hexahydrates: eidem, ibid., pp 1348-1350. Toxicity data: Cavalli, Arch. Int. Pharmacodyn. 62, 330 (1939).
Properties: Violet, lustrous, hexagonal, cryst scales. Greasy feel. mp 1152°; dissociates above 1300°. d25 2.87. The rate of soln in water, acids, organic solvents is extremely slow. Addition of a trace of CrCl2 or wetting agent aid in rapid soln in water, alcohol. Also exists in hygroscopic, sol, peach-blossom colored form. Keep tightly closed. MLD in frogs, mice, rabbits (mg/kg): 187, 801, 288 i.v. (Cavalli).
Melting point: mp 1152°
Density: d25 2.87
Toxicity data: MLD in frogs, mice, rabbits (mg/kg): 187, 801, 288 i.v. (Cavalli)
Derivative Type: Hexahydrates
Properties: Several known isomers. Dichlorotetraaquochromium chloride dihydrate, [trans-[CrCl2(H2O)4]Cl.2H2O]; dark green salt, monoclinic crystals; d 1.849: Freeman, Dance, Inorg. Chem. 4, 1555 (1965); Morosin, Acta Crystallogr. 21, 280 (1966). Hexaaquochromium trichloride, [[Cr(H2O)6]Cl3]; violet, rhombohedral hydrate. Chloropentaaquochromium dichloride monohydrate, [[CrCl(H2O)5]Cl2.H2O]; light green isomer. All are deliquesc in air. Sol in water; dil aq solns are violet, concd aq solns are green. pH of 0.2 molar aq soln 2.4. Sol in alcohol; slightly sol in acetone. Practically insol in ether. Keep well closed.
Density: d 1.849: Freeman, Dance, Inorg. Chem. 4, 1555 (1965); Morosin, Acta Crystallogr. 21, 280 (1966)
Use: In chromizing; manuf of Cr metal and compds; as catalyst for polymerization of olefins and other organic reactions; as textile mordant; in tanning; in corrosion inhibitors; as waterproofing agent. |