Methylene Iodide
Title: Methylene Iodide
CAS Registry Number: 75-11-6
CAS Name: Diiodomethane
Molecular Formula: CH2I2
Molecular Weight: 267.84
Percent Composition: C 4.48%, H 0.75%, I 94.76%
Literature References: Prepd by the reduction of iodoform with sodium arsenite: Adams, Marvel, Org. Synth. vol. 1, p 57 (1921). Also by heating iodoform with sodium acetate in alcohol: Bagnara, Eng. Min. J. Press 116, 51 (1923). Absorption spectrum: Lowry, Sass, J. Chem. Soc. 1926, 624; Stepanov, Acta Physicochim. URSS 20, 174 (1945).
Properties: Very heavy, highly refractive liq. Darkens on exposure to light, air, and moisture. d420 3.32537. Solidifies in leaflets at 5.2° or in thin needles at 5.7°. Usually cooling to 0° is necessary to start crystn. mp 6.0°. bp760 181°; bp70 107°; bp11 68°. nD10.5 1.7559; nD15 1.7425. Viscosity (cP): 3.35 (10°); 2.80 (20°); 2.39 (30°). Sol in about 70 parts water; miscible with alcohol, propanol, isopropanol, hexane, cyclohexane, ether, chloroform, benzene. CH2I2 dissolves sulfur and phosphorus (more than 1:1 at 25°).
Melting point: mp 6.0°
Boiling point: bp760 181°; bp70 107°; bp11 68°
Index of refraction: nD10.5 1.7559; nD15 1.7425
Density: d420 3.32537
Use: In separating mixtures of minerals. In determining the specific gravity of minerals and other substances. In the manufacture of x-ray contrast media.

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