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PolyiodideThe polyiodides are a class of polyatomic halide anions composed entirely of iodine atoms. Additional recommended knowledgeThe triiodide ion, I3-, is the simplest polyiodide. Larger polyiodides are known, with single or multiple negative charges. The basic 'building blocks' of polyiodides can be considered as I2, I-, and I3-. The more complex polyiodides can be made by addition of I2 to solutions containing I- and I3-, with the condition of presence of large cations to stabilise them. With cations much smaller than NMe4+, it is either not possible to precipitate the salt (for example with Na+ or K+ cations), or the crystal structure will show asymmetric iodide anions, like in caesium triiodide, CsI3. The shapes of the polyiodides depend on their associated cations quite strongly, however some of the more simple ions have roughly constant shapes:
Categories: Iodine | Iodine compounds |
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Polyiodide". A list of authors is available in Wikipedia. |