Iodides

Iodides 

chemical compounds of iodine and other elements. The iodides of many metals are hydriodic acid salts. Typical salts are the iodides of metals in Groups I and II of the Mendeleev periodic system. Most of these are readily soluble in water (except for Agl, Cu₂I₂, and Hg₂I₂) as well as in alcohols and other polar solvents. Iodides of metals from Groups III, IV, V, and VI as well as the iodides of nonmetals (B, Si, P, As, Sb) are fusible and are even soluble in nonpolar solvents. Upon heating, these iodides readily dissociate into the element and iodine, which is used in the preparation of especially pure substances (titanium, zirconium, and many others; seeIODIDE PROCESS).

Interaction with elementary iodine is characteristic of certain iodides, as a result of which polyiodes (for example, KI₃) are formed. Iodides are obtained by the direct interaction of elements, the interaction of oxides or carbonates with hydriodic acid, and by other methods. Iodides are sometimes also referred to as organic iodine derivatives (for example, CH₃I—methyl iodide).