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The following exergonic equilibrium gives rise to the triiodide ion: . I 2 + I − ⇌ I − 3. In this reaction, iodide is viewed as a Lewis base, and the iodine is a Lewis acid.The process is analogous to the reaction of S 8 with sodium sulfide (which forms polysulfides) except that the higher polyiodides have branched structures.
Antimony triiodide is the chemical compound with the formula Sb I 3. This ruby-red solid is the only characterized "binary" iodide of antimony, i.e. the sole compound isolated with the formula Sb x I y. It contains antimony in its +3 oxidation state. Like many iodides of the heavier main group elements, its structure depends
Molar mass: 455.635 g/mol ... orange-red crystalline solid Density: 4.69 g/cm 3: Melting point: 146 °C (295 °F; 419 K) ... Arsenic triiodide is the inorganic ...
The polyiodides are a class of polyhalogen anions composed entirely of iodine atoms. [1] [2] The most common member is the triiodide ion, I −3.Other known larger polyiodides include [I 4] 2−, [I 5] −, [I 6] 2−, [I 7] −, [I 8] 2−, [I 9] −, [I 10] 2−, [I 10] 4−, [I 11] 3−, [I 12] 2−, [I 13] 3−, [I 14] 4-, [I 16] 2−, [I 22] 4−, [I 26] 3−, [I 26] 4−, [I 28] 4− and ...
In its pure state, boron triiodide forms colorless, otherwise reddish, shiny, air and hydrolysis-sensitive [3] crystals, which have a hexagonal crystal structure (a = 699.09 ± 0.02 pm, c = 736.42 ± 0.03 pm, space group P6 3 /m (space group no. 176)). [4] Boron triiodide is a strong Lewis acid and soluble in carbon disulfide. [2]
Phosphorus triiodide (PI 3) is an inorganic compound with the formula PI 3. A red solid, it is too unstable to be stored for long periods of time; it is, nevertheless, commercially available. [ 2 ] It is widely used in organic chemistry for converting alcohols to alkyl iodides and also serves as a powerful reducing agent.
Thallium triiodide is a chemical compound of thallium and iodine with formula TlI 3. Unlike the other thallium trihalides, which contain thallium(III), TlI 3 is a thallium(I) salt and contains the triiodide ion, I − 3. An appreciation as to why Tl + is not oxidised to Tl 3+ in the reaction: Tl 3+ + 2 I − → Tl + + I 2
An important application of caesium iodide crystals, which are scintillators, is electromagnetic calorimetry in experimental particle physics.Pure CsI is a fast and dense scintillating material with relatively low light yield that increases significantly with cooling, [11] and a fairly small Molière radius is 3.5 cm.