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The low solubility of silver iodide and lead iodide reflects the covalent character of these metal iodides. A test for the presence of iodide ions is the formation of yellow precipitates of these compounds upon treatment of a solution of silver nitrate or lead(II) nitrate. [2] Aqueous solutions of iodide salts dissolve iodine better than pure ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 4 February 2025. This article is about the chemical element. For other uses, see Iodine (disambiguation). Chemical element with atomic number 53 (I) Iodine, 53 I Iodine Pronunciation / ˈ aɪ ə d aɪ n, - d ɪ n, - d iː n / (EYE -ə-dyne, -din, -deen) Appearance lustrous metallic gray solid ...
Most metal iodides with the metal in low oxidation states (+1 to +3) are ionic. Nonmetals tend to form covalent molecular iodides, as do metals in high oxidation states from +3 and above. Both ionic and covalent iodides are known for metals in oxidation state +3 (e.g. scandium iodide is mostly ionic, but aluminium iodide is not).
The first such compound was synthesised in 1894, via the silver hydroxide-catalyzed coupling of two aryl iodides (the Meyer–Hartmann reaction): [19] [20] [21] Alternatively, the iodane may be formed in situ: an aryl iodide is oxidized to an aryliodine(III) compound (such as ArIO), followed by a ligand exchange.
Copper(I) iodide, like most binary (containing only two elements) metal halides, is an inorganic polymer. It has a rich phase diagram , meaning that it exists in several crystalline forms. It adopts a zinc blende structure below 390 °C (γ-CuI), a wurtzite structure between 390 and 440 °C (β-CuI), and a rock salt structure above 440 °C (α ...
These may be metal salts containing iodide ion such as potassium iodide, or more covalent iodides such as phosphorus triiodide. See also. Category:Metal halides;
Thallium(I) iodide is are chemical compounds with the formula TlI. It is exists as both a solid and high temperature red polymorph . Thallium(I) iodide is one of several water-insoluble metal iodides , along with AgI , CuI , SnI 2 , SnI 4 , PbI 2 , and HgI 2 .
TiI 4 is a rare molecular binary metal iodide, consisting of isolated molecules of tetrahedral Ti(IV) centers. The Ti-I distances are 261 pm. [3] Reflecting its molecular character, TiI 4 can be distilled without decomposition at one atmosphere; this property is the basis of its use in the van Arkel–de Boer process.