PRODUCT IDENTIFICATION
CLASSIFICATION
PHYSICAL AND CHEMICAL PROPERTIES
4.32
VAPOR DENSITY
AUTOIGNITION
REFRACTIVE INDEX
APPLICATIONS
Iodine is a nonmetallic halogen element in Group 17 of periodic table; atomic number 53; atomic mass 126.9; melting point ca 114 C; boiling point ca 184 C; specific gravity 4.93 g/cm3; oxidation states: 7,5,1,-1; [Kr] 4d10 5s2 5p5. Iodine is a nearly black poisonous, corrosive solid at room temperature and readily sublimes to a deep violet vapour, the colour of which is responsible for its name from Greek. It is insoluble in water, soluble in common solvents. Iodine is required in small amounts in human body for the function of the thyroid gland. Iodine forms many important compounds of iodine such as iodine(V)oxide, potassium iodide, iodine trichloride and iodoform of an Iodine containing organic compound.
The related name, iodate indicates any salt of iodic acid containing the IO3- radical; KIO3 (potassium iodate) and NaIO3 (sodium iodate) are the most important salts. Whereas, iodide indicates any compound of iodine with a more electropositive element or group such as such as CH3CH2I or any binary compound of iodine which may contain the I- radical and which may be considered to be derived from hydriodic acid (HI); KI and NaI are examples.
Organic iodines are very useful reagents as they have lower heat of formation than chlorine or bromine analogues. Aliphatic Iodides are used as alkylating agents in synthetic organic chemistry. Iodoform is a simple structural compound; greenish yellow hexagonal solid with a strong, penetrating odor; containing about 96 per cent of iodine; melting point 119 C; soluble in chloroform and ether and somewhat in alcohol and water: used as a topical anti-infective, applied to the skin. Iodoacetic acid is used in biochemical research; it alkylates free thiol groups but not disulfide bridges. methyl iodide, also called iodomethane, is a colorless liquid that turns brown on exposure to light; used in microscopy and in testing for pyridine. It is irritating to skin and mucous membranes and is a suspected carcinogen. Ethylene diamine dihydroiodide is used in animal feeds to prevent deficiency of iodine. Iodine organic compounds are useful in dye industry for the high bright colors as well as pharmaceutical industry. They are important for the production of X-ray contrast media and for the formulating antiseptics.
APPEARANCE
97.0% min
167 - 171 C