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Tetraiodide
tetraiodide may refer to: *Carbon tetraiodide, CI4 *Diphosphorus tetraiodide, P2I4, an orange crystalline solid and a versatile reducing agent * Germanium tetraiodide, GeI4 * Iridium tetraiodide, IrI4 * Niobium tetraiodide, NbI4 * Platinum tetraiodide, PtI4 * Polonium tetraiodide, PoI4 * Protactinium tetraiodide, PaI4 * Rhenium tetraiodide, ReI4 *Silicon tetraiodide, SiI4 * Tantalum tetraiodide, TaI4 *Tellurium tetraiodide, TeI4 * Thorium tetraiodide, ThI4 *Tin tetraiodide, SnI4 *Titanium tetraiodide Titanium tetraiodide is an inorganic compound with the formula TiI4. It is a black volatile solid, first reported by Rudolph Weber in 1863. It is an intermediate in the van Arkel–de Boer process for the purification of titanium. Physical prop ..., TiI4 * Tungsten tetraiodide, WI4 * Uranium tetraiodide, UI4 {{Chemistry index ...
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Carbon Tetraiodide
Carbon tetraiodide is a tetrahalomethane with the molecular formula CI4. Being bright red, it is a relatively rare example of a highly colored methane derivative. It is only 2.3% by weight carbon, although other methane derivatives are known with still less carbon. Structure The tetrahedral molecule features C-I distances of 2.12 ± 0.02 Å. The molecule is slightly crowded with short contacts between iodine atoms of 3.459 ± 0.03 Å, and possibly for this reason, it is thermally and photochemically unstable. Carbon tetraiodide crystallizes in tetragonal crystal structure (''a'' 6.409, ''c'' 9.558 (.10−1 nm)). It has zero dipole moment due to its symmetrically substituted tetrahedral geometry. Properties, synthesis, uses Carbon tetraiodide is slightly reactive towards water, giving iodoform and I2. It is soluble in nonpolar organic solvents. It decomposes thermally and photochemically to tetraiodoethylene, C2I4. Its synthesis entails AlCl3-catalyzed halide exchange, whic ...
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Diphosphorus Tetraiodide
Diphosphorus tetraiodide is an orange crystalline solid with the formula P2I4. It has been used as a reducing agent in organic chemistry. It is a rare example of a compound with phosphorus in the +2 oxidation state, and can be classified as a subhalide of phosphorus. It is the most stable of the diphosphorus tetrahalides. Synthesis and structure Diphosphorus tetraiodide is easily generated by the disproportionation of phosphorus triiodide in dry ether: :2 PI3 → P2I4 + I2 It can also be obtained by treating phosphorus trichloride and potassium iodide in anhydrous conditions. The compound adopts a centrosymmetric structure with a P-P bond of 2.230 Å. Reactions Inorganic chemistry Diphosphorus tetraiodide reacts with bromine to form mixtures PI3−xBrx. With sulfur, it is oxidized to P2S2I4, retaining the P-P bond. It reacts with elemental phosphorus and water to make phosphonium iodide, which is collected via sublimation at 80 °C. Organic chemistry Diphosphorus tetr ...
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Protactinium Tetraiodide
Protactinium tetraiodide is a binary inorganic compound of protactinium metal and iodine with the chemical formula . Synthesis Protactinium tetraiodide can be prepared by reducing the pentaiodide with aluminum at about 400 °C: : Also, a reaction of hydrogen reduction of protactinium(V) iodide at 400 °C: : Physical properties The compound forms black or dark green crystals. The structure is not known. Chemical properties The compound is oxidized by antimony trioxide when heated in a vacuum: : The compound also reacts with quartz Quartz is a hard, crystalline mineral composed of silica ( silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical ... when heated: : References {{Actinide halides Protactinium compounds Iodine compounds Iodides ...
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Titanium Tetraiodide
Titanium tetraiodide is an inorganic compound with the formula TiI4. It is a black volatile solid, first reported by Rudolph Weber in 1863. It is an intermediate in the van Arkel–de Boer process for the purification of titanium. Physical properties TiI4 is a rare molecular binary metal iodide, consisting of isolated molecules of tetrahedral Ti(IV) centers. The Ti-I distances are 261 pm. Reflecting its molecular character, TiI4 can be distilled without decomposition at one atmosphere; this property is the basis of its use in the van Arkel–de Boer process. The difference in melting point between TiCl4 (m.p. -24 °C) and TiI4 (m.p. 150 °C) is comparable to the difference between the melting points of CCl4 (m.p. -23 °C) and CI4 (m.p. 168 °C), reflecting the stronger intermolecular van der Waals bonding in the iodides. Two polymorphs of TiI4 exist, one of which is highly soluble in organic solvents. In the less soluble cubic form, the Ti-I distances are 261 ...
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Rhenium Tetraiodide
Rhenium tetraiodide is a binary chemical compound of rhenium and iodide with the chemical formula . Synthesis Rhenium tetraiodide can be obtained via the reduction of perrhenic acid with hydrogen iodide: :: Physical properties Rhenium tetraiodide forms black solid substance which is soluble in acetone and ether In organic chemistry, ethers are a class of compounds that contain an ether group—an oxygen atom connected to two alkyl or aryl groups. They have the general formula , where R and R′ represent the alkyl or aryl groups. Ethers can again be c .... Hydrolyzed by water, hygroscopic. Chemical properties Rhenium tetraiodide is hydrolyzed by water: :: Rhenium tetraiodide decomposes when heated: :: References Rhenium compounds Iodides {{inorganic-compound-stub ...
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Iridium Tetraiodide
Iridium(IV) iodide is a binary chemical compound of iridium Iridium is a chemical element with the symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, it is considered the second-densest naturally occurring metal (after osmium) with a density of ... and iodide with the chemical formula . Preparation Iridium(IV) iodide can be obtained by reacting dipotassium hexachloroiridate or hexachloroiridic acid with an aqueous solution of potassium iodide. Properties Iridium tetraiodide forms black crystals, does not dissolve in water and alcohol. In alkali metal iodide solutions, the compound dissolves easily to give a ruby red solution, forming complex salts. The compound decomposes when heated: :: Uses Iridium(IV) iodide can be used as a catalyst in organic chemistry. References Iridium compounds Iodides Platinum group halides {{inorganic-compound-stub ...
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Silicon Tetraiodide
Silicon tetraiodide is the chemical compound with the formula Si I4. It is a tetrahedral molecule with Si-I bond lengths of 2.432(5) Å. SiI4 is a precursor to silicon amides of the formula Si(NR2)4 (R = alkyl). It has also been of interest in the manufacture and etching of silicon in microelectronics. Reactions This compound is stable among strong heating. It can be stored at room temperature for long periods but must be kept dry because it reacts quickly with water and moisture in the air. It can be made on a large scale by reaction of silicon or silicon carbide with iodine on heating to about 200 °C. Of more academic interest is the reaction of silane with iodine vapour at 130 - 150 °C, as this produces a series of compounds ranging from iodosilane Iodosilane is a chemical compound of silicon, hydrogen, and iodine. It is a colorless monoclinic crystal of space group P21/c at −157 °C. Preparation Iodosilane is the first product of the reaction between monosilane a ...
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Tin Tetraiodide
Tin(IV) iodide, also known as stannic iodide, is the chemical compound with the formula SnI4. This tetrahedral molecule crystallizes as a bright orange solid that dissolves readily in nonpolar solvents such as benzene. The compound is usually prepared by the reaction of iodine and tin: : Sn + 2 I2 → SnI4 The compound hydrolyses in water. In aqueous hydroiodic acid, it reacts to form a rare example of a hexaiodometallate: : SnI4 + 2 I− → nI6sup>2− See also *Tin(II) iodide *Tin(IV) chloride Tin(IV) chloride, also known as tin tetrachloride or stannic chloride, is an inorganic compound with the formula Sn Cl4. It is a colorless hygroscopic liquid, which fumes on contact with air. It is used as a precursor to other tin compounds. It ... References {{Iodides Tin(IV) compounds Iodides Metal halides ...
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Platinum Tetraiodide
Platinum(IV) iodide is a inorganic compound with the formula . A dark brown diamagnetic solid, it is one of several binary iodides of platinum. Synthesis The effect of iodine on platinum: : Also, decomposition of hydrogen hexaiodoplatinate(IV) at 80 °C: : Physical properties Platinum(IV) iodide forms dark brown crystals of several modifications: ''α''-, rhombic crystal system, spatial group ''P bca'', cell parameters a = 1.290 nm, b = 1.564 nm, c = 0.690 nm, Z = 8; ''β''-, cubic crystal system, spatial group ''P m3m'', cell parameters a = 0.56 nm, Z = 1; ''γ''-, tetragonal crystal system, spatial group ''I 41/a'', cell parameters a = 0.677 nm, c = 3.110 nm, Z = 8. decomposes in water. Soluble in alcohol, acetone, alkali, HI, KI, liquid . Chemical properties Decomposes when heated: : When dissolved in hydroiodic acid Hydroiodic acid (or hydriodic acid) is an aqueous solution of hydrogen iodide (HI). It is a strong acid, one that is ionized completely in an aqueo ...
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Tungsten Tetraiodide
Tungsten(IV) iodide is a binary inorganic compound of tungsten metal and iodine with the chemical formula . Preparation Reaction of tungsten(VI) chloride with hydrochloric acid: : Reaction of tungsten(IV) chloride with hydrochloric acid: : Physical properties Tungsten(IV) iodide forms black crystals of the triclinic crystal system. Insoluble in cold water, diethyl ether, and chloroform. It dissolves in ethanol Ethanol (abbr. EtOH; also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic compound. It is an alcohol with the chemical formula . Its formula can be also written as or (an ethyl group linked to a h .... Chemical properties The compound decomposes when heated in vacuum: : It hydrolyzes in hot water: : Reacts with chlorine and bromine: : : References {{Iodides Tungsten(IV) compounds Iodine compounds Iodides Triclinic crystals ...
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Polonium Tetraiodide
Polonium tetraiodide is a binary inorganic compound of polonium and iodine with the chemical formula . The compound forms volatile black crystals. Synthesis 1. Action of iodine vapor on polonium metal: ::Po + 2I2 -> PoI4 2. Dissolution of polonium dioxide in hydroiodic acid: :: PoO2 + 4HI -> PoI4 + 2H2O Properties Physical properties The compound forms black crystals that are insoluble in water. Chemical properties The compound reacts with hydroiodic acid to form hexaiodopolonic acid: :: PoI4 + 2HI -> H2 oI6/chem> It can be reduced by hydrogen sulfide Hydrogen sulfide is a chemical compound with the formula . It is a colorless chalcogen-hydride gas, and is poisonous, corrosive, and flammable, with trace amounts in ambient atmosphere having a characteristic foul odor of rotten eggs. The und ... to yield polonium metal. It decomposes on heating. References {{Polonium compounds Polonium compounds Iodides ...
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Niobium Tetraiodide
Niobium(IV) iodide is an iodide of niobium, with the chemical formula of NbI4. Preparation Niobium(IV) iodide can be obtained by the decomposition of niobium(V) iodide Niobium(V) iodide is the inorganic compound with the formula Nb2I10. Its name comes from the compound's empirical formula, NbI5. It is a diamagnetic, yellow solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral structur ... under a vacuum at 206-270 °C. Properties Niobium(IV) iodide is a grey solid that reacts with water. Niobium(IV) iodide is an orthorhombic crystal with space group Cmc21 (No. 36). Its crystal is formed by NbI6 octahedra connected by edges and also contains Nb-Nb bonds. At 348 to 417 °C, the crystal structure of niobium(IV) iodide changes. Niobium(IV) iodide turns into a metal under extremely high pressure. References {{Iodides Niobium compounds Iodides ...
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