出典:Wiktionary
出典:『Wiktionary』 (2024/11/10 18:22 UTC 版)
triiodide (plural triiodides)
出典:Wikipedia
出典:『Wikipedia』 (2010/09/21 07:52 UTC 版)
In chemistry, triiodide (sometimes written tri-iodide) can have several meanings. Triiodide primarily refers to the triiodide ion, I3−, a polyatomic anion composed of three iodine atoms. For some chemical compounds, triiodide indicates a salt of the named cation with the triiodide anion. Examples include sodium triiodide, thallium triiodide, and ammonium triiodide, [NH4][I3]. Each of these compounds has a (mono)iodide counterpart. For other chemical compounds, triiodide indicates that each molecule contains three iodine atoms that are not bonded to each other, not forming the triiodide ion. Examples include nitrogen triiodide (NI3), phosphorus triiodide, antimony triiodide, and gallium triiodide (Ga2I6). Some anions have the theoretical possibility to form either kind of triiodide. Thallium triiodide is described as thallium(I) triiodide; thallium(III) iodide is unknown.