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Octafluoride
An octafluoride is a compound or ion with the formula or , where ''n'', ''m'' and ''q'' are independent variables and R any substituent and M is a central element (often a metal). All of the examples listed below are with ''q'' between 1 and 4 inclusive. Neutral octafluorides No electrically neutral octafluorides are currently known to exist, although osmium octafluoride, , is theoretically possible. An early report of the synthesis of was much later shown to be a mistaken identification of . Anionic octafluorides In contrast, many anionic octafluorides are known, such as the octafluorozirconate(IV) (), octafluorotantalate(V) (), octafluoroniobate(V) (), octafluoromolybdate(VI) (), octafluorotungstate(VI) (), octafluororhenate(VII) (), octafluoroiodate(VII) (), octafluoroiridate(VII) (), and octafluoroxenate(VI) () anions. References {{reflist Fluorides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osmium Octafluoride
Osmium octafluoride is an inorganic chemical compound of osmium metal and fluorine with the chemical formula . Some sources consider it to be a still hypothetical compound. An early report of the synthesis of was much later shown to be a mistaken identification of . Theoretical analysis indicates would have an approximately square antiprismatic molecular geometry In chemistry, the square antiprismatic molecular geometry describes the shape of compounds where eight atoms, groups of atoms, or ligands are arranged around a central atom, defining the vertices of a square antiprism. This shape has D4d symmetr .... Potential synthesis Rapid cooling of fluorine and osmium reaction products: : References Osmium compounds Fluorides Metal halides Hypothetical chemical compounds Theoretical chemistry {{inorganic-compound-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fluorine
Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. As the most electronegative reactive element, it is extremely reactive, as it reacts with all other elements except for the light inert gases. Among the elements, fluorine ranks 24th in universal abundance and 13th in terrestrial abundance. Fluorite, the primary mineral source of fluorine which gave the element its name, was first described in 1529; as it was added to metal ores to lower their melting points for smelting, the Latin verb meaning 'flow' gave the mineral its name. Proposed as an element in 1810, fluorine proved difficult and dangerous to separate from its compounds, and several early experimenters died or sustained injuries from their attempts. Only in 1886 did French chemist Henri Moissan isolate elemental fluorine using low-temperature electrolysis, a process still employed for moder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osmium Hexafluoride
Osmium hexafluoride, also osmium(VI) fluoride, (OsF6) is a compound of osmium and fluorine, and one of the seventeen known binary hexafluorides. Synthesis Osmium hexafluoride is made by a direct reaction of osmium metal exposed to an excess of elemental fluorine gas at 300 °C. : + 3 → Description Osmium hexafluoride is a yellow crystalline solid that melts at 33.4 °C and boils at 47.5 °C. The solid structure measured at −140 °C is orthorhombic space group ''Pnma''. Lattice parameters are ''a'' = 9.387 Å, ''b'' = 8.543 Å, and ''c'' = 4.944 Å. There are four formula units (in this case, discrete molecules) per unit cell, giving a density of 5.09 g·cm−3. The OsF6 molecule itself (the form important for the liquid or gas phase) has octahedral molecular geometry, which has point group ('' Oh''). The Os–F bond length is 1.827 Å. Partial hydrolysis of OsF6 produces OsOF4. References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhenium Heptafluoride
Rhenium heptafluoride is the compound with the formula ReF7. It is a yellow low melting solid and is the only thermally stable metal heptafluoride. It has a distorted pentagonal bipyramidal structure similar to IF7, which was confirmed by neutron diffraction at 1.5 K. The structure is non-rigid, as evidenced by electron diffraction studies. Production, reactions and properties Rhenium heptafluoride can be prepared from the elements at 400 °C: :2 Re + 7 F2 → 2 ReF7 It also can be produced by the explosion of rhenium metal under sulfur hexafluoride. It hydrolyzes under a base to form perrhenic acid Perrhenic acid is the chemical compound with the formula . It is obtained by evaporating aqueous solutions of . Conventionally, perrhenic acid is considered to have the formula , and a species of this formula forms when rhenium(VII) oxide sublime ... and hydrogen fluoride: :ReF7 + 4H2O → HReO4 + 7HF With fluoride donors such as CsF, the ReF8− anion is formed, which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrosonium Octafluoroxenate(VI)
Nitrosonium octafluoroxenate(VI) is a chemical compound of xenon with nitrogen, oxygen, and fluorine, having formula . It is an ionic compound containing well-separated nitrosonium cations (NO+) and octafluoroxenate(VI) anions (). The molecular geometry of the octafluoroxenate(VI) ion is square antiprismatic, having Xe–F bond lengths of 1.971 Å, 1.946 Å, 1.958 Å, 2.052 Å, and 2.099 Å. It is synthesized by the reaction of xenon hexafluoride () with nitrosyl fluoride Nitrosyl fluoride ( N O F) is a covalently bonded nitrosyl compound. Reactions NOF is a highly reactive fluorinating agent that converts many metals to their fluorides, releasing nitric oxide in the process: :''n'' NOF + M → MF''n'' + ''n'' NO ... (NOF): : + 2 NOF → Other compounds containing the octafluoroxenate(VI) ion include its alkali metal salts, including Cs2XeF8 and Rb2XeF8, which are stable up to 400 °C. References Xenon(VI) compounds Fluoro complexes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
