Synthesis
Direct interaction of pure substances: [2]
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| Names | |
|---|---|
| Other names Diselenium diiodide | |
| Identifiers | |
3D model (JSmol) | |
| |
| Properties | |
| I2Se2 | |
| Molar mass | 411.751 g·mol−1 |
| Appearance | Gray crystals[ citation needed ] |
| Melting point | 70 °C (158 °F; 343 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Selenium iodide is a binary inorganic compound of selenium and iodine with the chemical formula Se
2I
2. [1] The compound decomposes in water.
Direct interaction of pure substances: [2]
Selenium iodide forms gray crystals.
The compound decomposes in and reacts with water: [3]
Iodine is a chemical element with the symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at 114 °C (237 °F), and boils to a violet gas at 184 °C (363 °F). The element was discovered by the French chemist Bernard Courtois in 1811 and was named two years later by Joseph Louis Gay-Lussac, after the Ancient Greek Ιώδης 'violet-coloured'.
Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. It seldom occurs in its elemental state or as pure ore compounds in the Earth's crust. Selenium – from Greek selḗnē – was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element to the previously discovered tellurium.
In chemistry, disproportionation, sometimes called dismutation, is a redox reaction in which one compound of intermediate oxidation state converts to two compounds, one of higher and one of lower oxidation states. More generally, the term can be applied to any desymmetrizing reaction of the following type, regardless of whether it is a redox or some other type of process:
Hydrogen iodide is a diatomic molecule and hydrogen halide. Aqueous solutions of HI are known as hydroiodic acid or hydriodic acid, a strong acid. Hydrogen iodide and hydroiodic acid are, however, different in that the former is a gas under standard conditions, whereas the other is an aqueous solution of the gas. They are interconvertible. HI is used in organic and inorganic synthesis as one of the primary sources of iodine and as a reducing agent.
Gold compounds are compounds by the element gold (Au). Although gold is the most noble of the noble metals, it still forms many diverse compounds. The oxidation state of gold in its compounds ranges from −1 to +5, but Au(I) and Au(III) dominate its chemistry. Au(I), referred to as the aurous ion, is the most common oxidation state with soft ligands such as thioethers, thiolates, and organophosphines. Au(I) compounds are typically linear. A good example is Au(CN)−2, which is the soluble form of gold encountered in mining. The binary gold halides, such as AuCl, form zigzag polymeric chains, again featuring linear coordination at Au. Most drugs based on gold are Au(I) derivatives.
Selenium compounds commonly exist in the oxidation states −2, +2, +4, and +6.
Iodine can form compounds using multiple oxidation states. Iodine is quite reactive, but it is much less reactive than the other halogens. For example, while chlorine gas will halogenate carbon monoxide, nitric oxide, and sulfur dioxide, iodine will not do so. Furthermore, iodination of metals tends to result in lower oxidation states than chlorination or bromination; for example, rhenium metal reacts with chlorine to form rhenium hexachloride, but with bromine it forms only rhenium pentabromide and iodine can achieve only rhenium tetraiodide. By the same token, however, since iodine has the lowest ionisation energy among the halogens and is the most easily oxidised of them, it has a more significant cationic chemistry and its higher oxidation states are rather more stable than those of bromine and chlorine, for example in iodine heptafluoride.
Magnesium iodide is the name for the chemical compounds with the formulas MgI2 and its various hydrates MgI2(H2O)x. These salts are typical ionic halides, being highly soluble in water.
Nickel compounds are chemical compounds containing the element nickel which is a member of the group 10 of the periodic table. Most compounds in the group have an oxidation state of +2. Nickel is classified as a transition metal with nickel(II) having much chemical behaviour in common with iron(II) and cobalt(II). Many salts of nickel(II) are isomorphous with salts of magnesium due to the ionic radii of the cations being almost the same. Nickel forms many coordination complexes. Nickel tetracarbonyl was the first pure metal carbonyl produced, and is unusual in its volatility. Metalloproteins containing nickel are found in biological systems.
Selenium tetrabromide is an inorganic compound with a chemical formula SeBr4.
Samarium(III) iodide is an inorganic compound, a salt of samarium and hydroiodic acid with the chemical formula SmI
3.
Polonium tetraiodide is a binary inorganic compound of polonium and iodine with the chemical formula PoI
4. The compound forms volatile black crystals.
Yttrium iodide is a binary inorganic compound, a salt of yttrium and hydroiodic acid with the formula YI
3. The compound forms colorless crystals, soluble in water.
Osmium iodide refers to compounds of osmium with the formula OsIn. Several have been mentioned in the literature, but all iodides except the tetraiodide have been verified by X-ray crystallography.
Neodymium(III) iodide is an inorganic salt of iodine and neodymium the formula NdI3. Neodymium uses the +3 oxidation state in the compound. The anydrous compound is a green powdery solid at room temperature.
Praseodymium(III) iodide is an inorganic salt, consisting of the rare-earth metal praseodymium with hydrogen iodide with the chemical formula PrI3, with green crystals. It is soluble in water.
Tetraiodine nonoxide is an iodine oxide with the chemical formula I4O9.
Europium(III) iodide is an inorganic compound containing europium and iodine with the chemical formula EuI3.
Disulfur diiodide is an unstable chemical compound with the formula S2I2. It is a red-brown solid that decomposes above -30 °C to elemental sulfur and iodine.
