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Gold Pentafluoride
Gold(V) fluoride is the inorganic compound with the formula Au2F10. This fluoride compound features gold in its highest known oxidation state. This red solid dissolves in hydrogen fluoride but these solutions decompose, liberating fluorine. The structure of gold(V) fluoride in the solid state is centrosymmetric with hexacoordinated gold and an octahedral arrangement of the fluoride centers on each gold center. It is the only known dimeric pentafluoride, although sulfur can form disulfur decafluoride; other pentafluorides are monomeric ( P, As, Sb, Cl, Br, I), tetrameric ( Nb, Ta, Cr, Mo, W, Tc, Re, Ru, Os, Rh, Ir, Pt), or polymeric ( Bi, V, U). In the gas phase, a mixture of dimer and trimer in the ratio 82:18 has been observed. Gold pentafluoride is the strongest known fluoride ion acceptor, exceeding the acceptor tendency of even antimony pentafluoride. Synthesis Gold(V) fluoride can be synthesized by heating gold metal in an atmosphere of oxygen and fluo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold(III) Fluoride
Gold(III) fluoride, , is an orange solid that sublimes at 300 °C. It is a powerful fluorinating agent. Preparation AuF3 can be prepared by reacting AuCl3 with F2 or BrF3. Structure The crystal structure of AuF3 consists of spirals of square-planar The square planar molecular geometry in chemistry describes the stereochemistry (spatial arrangement of atoms) that is adopted by certain chemical compounds. As the name suggests, molecules of this geometry have their atoms positioned at the corn ... AuF4 units. References External links * Fluorides Metal halides Gold(III) compounds Fluorinating agents Gold–halogen compounds {{inorganic-compound-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tantalum Pentafluoride
Tantalum(V) fluoride is the inorganic compound with the formula TaF5. It is one of the principal molecular compounds of tantalum. Characteristic of some other pentafluorides, the compound is volatile but exists as an oligomer in the solid state. Preparation and structure It is prepared by treating tantalum metal with fluorine gas. NbF5 is prepared similarly. Solid and molten TaF5 is tetrameric, consisting of four TaF6 centers linked via bridging fluoride centers. Gaseous TaF5 adopts the trigonal pyramidal structure with D3h symmetry. Reactions and derivatives The tendency of TaF5 to form clusters in the solid state indicates the Lewis acidity of the monomer. Indeed, TaF5 reacts with fluoride sources to give the ions , , and . With neutral Lewis bases, such as diethyl ether TaF5 forms adducts. is used in combination with HF as a catalyst for the alkylation of alkanes and alkenes and for the protonation of aromatic In chemistry, aromaticity is a chemical property ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uranium Pentafluoride
Uranium pentafluoride is the inorganic compound with the chemical formula UF5. It is a pale yellow paramagnetic solid. The compound has attracted interest because it is related to uranium hexafluoride, which is widely used to produce uranium fuel. It crystallizes in two polymorphs, called α- and β-UF5. Synthesis and structure Uranium pentafluoride is an intermediate in the conversion of uranium tetrafluoride to volatile UF6: :2UF4 + F2 → 2UF5 :2UF5 + F2 → 2UF6 It can be produced by reduction of the hexafluoride with carbon monoxide at elevated temperatures. : 2UF6 + CO → 2UF5 + COF2 Other reducing agents have been examined. The α form is a linear coordination polymer consisting of chains of octahedral uranium centers in which one of the five fluoride anion forms a bridge to the next uranium atom. The structure is reminiscent of that for vanadium pentafluoride. In the β form, the uranium centers adopt a square antiprismatic structure. The β polymorp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vanadium Pentafluoride
Vanadium(V) fluoride is the inorganic compound with the chemical formula VF5. It is a colorless volatile liquid. It is a highly reactive compound, as indicated by its ability to fluorinate organic substances. Properties and structure The compound is exclusively a monomer in the gas phase. In the gas phase it adopts D3h symmetric trigonal bipyramidal geometry as indicated by electron diffraction. As a solid, VF5 forms a polymeric structure with fluoride-bridged octahedral vanadium centers. The formation enthalpy of VF5 is -1429.4 ± 0.8 kJ/mol. It is the only known pentahalide of vanadium. Synthesis Vanadium pentafluoride can be prepared by fluorination of vanadium metal: : 2 V + 5 F2 → 2 VF5 Alternatively, disproportionation of vanadium tetrafluoride yields equal amounts of the solid trifluoride and the volatile pentafluoride: :2 VF4 → VF3 + VF5 This conversion is conducted at 650 °C. It can also be synthesized by using elemental fluorine to fluorinat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bismuth Pentafluoride
Bismuth pentafluoride is an inorganic compound with the formula BiF5. It is a white solid that is highly reactive. The compound is of interest to researchers but not of particular value. Structure BiF5 is polymeric and consists of linear chains of ''trans''-bridged corner sharing BiF6 octahedra. This is the same structure as ''α''-UF5. Preparation BiF5 can be prepared by treating BiF3 with F2 at 500 °C. :BiF3 + F2 → BiF5 In an alternative synthesis, ClF3 is the fluorinating agent at 350 °C. :BiF3 + ClF3 → BiF5 + ClF Reactions Bismuth pentafluoride is the most reactive of the pnictogen pentafluorides and is an extremely strong fluorinating agent. It reacts vigorously with water to form ozone and oxygen difluoride, and with iodine or sulfur at room temperature. BiF5 fluorinates paraffin oil (hydrocarbons In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons are examples of group 14 hydr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platinum Pentafluoride
Platinum pentafluoride is the inorganic compound with the empirical formula PtF5. This red volatile solid has rarely been studied but is of interest as one of the few binary fluorides of platinum, i.e., a compound containing only Pt and F. It is hydrolyzed in water. The compound was first prepared by Neil Bartlett by fluorination of platinum dichloride above 350 °C (below that temperature, only PtF4 forms). Its structure consists of a tetramer, very similar to that of ruthenium pentafluoride. Within the tetramers, each Pt adopts octahedral molecular geometry, with two bridging fluoride ligand In coordination chemistry, a ligand is an ion or molecule ( functional group) that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's elec ...s. References {{Fluorides Fluorides,5 Fluorides Platinum group halides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iridium Pentafluoride
Iridium(V) fluoride, IrF5, is a chemical compound of iridium and fluorine. A highly reactive yellow low melting solid, it has a tetrameric structure, Ir4F20, which contains octahedrally coordinated iridium atoms.Egon Wiberg, Arnold Frederick Holleman (2001) ''Inorganic Chemistry'', Elsevier This structure is shared with RuF5 and OsF5. It can be prepared by the controlled decomposition of IrF6 or the reduction of IrF6 with silicon Silicon is a chemical element with the symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster, and is a tetravalent metalloid and semiconductor. It is a member of group 14 in the periodic ta ... powder or H2 in anhydrous HF. 2IrF6 + H2 -> 2IrF5 + 2HF 4IrF6 + Si -> 4IrF5 + SiF4 See also * Iridium(VI) fluoride * Iridium(IV) fluoride References {{Fluorides Iridium compounds Fluorides Platinum group halides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodium Pentafluoride
Rhodium pentafluoride is an inorganic compound with the formula Rh4F20. It is a red solid. It is prepared by fluorination of rhodium trifluoride at 400 °C. According to X-ray crystallography, the Rh centers are octahedral. The structure is very similar to that of the related ruthenium pentafluoride, osmium pentafluoride, and iridium pentafluoride. All are tetrameric, meaning that they have the molecular structure [MF5]4. The M-F distances for the bridging ligand, bridging fluoride ligands are typically about 0.2 Å longer than the Rh-F distances for the nonbridging fluoride ligands. In the case of rhodium pentafluoride, these distances average 1.999(4) and 1.808(8) Å. The Rh-F-Rh angles average 135°, which leads to a ruffled structure. In contrast, the M-F-M centers are linear in the pentafluorides of niobium, tantalum, molybdenum, and tungsten. References [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osmium Pentafluoride
Osmium pentafluoride is an inorganic compound with the formula OsF5. It is a blue-green solid. Like the pentafluorides of Ru, Rh, and Ir, OsF5 exists as a tetramer in the solid state. Preparation Osmium pentafluoride can be prepared by reduction of osmium hexafluoride with iodine as a solution in iodine pentafluoride Iodine pentafluoride is an interhalogen compound with chemical formula IF5. It is one of the fluorides of iodine. It is a colorless liquid, although impure samples appear yellow. It is used as a fluorination reagent and even a solvent in special ...: :10 OsF6 + I2 → 10 OsF5 + 2 IF5 References {{fluorine compounds Osmium compounds Fluorides Platinum group halides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ruthenium Pentafluoride
Ruthenium pentafluoride is the inorganic compound with the empirical formula RuF5. This green volatile solid has rarely been studied but is of interest as a binary fluoride of ruthenium, i.e. a compound containing only Ru and F. It is sensitive toward hydrolysis. Its structure consists of Ru4F20 tetramers, as seen in the isostructural platinum pentafluoride. Within the tetramers, each Ru adopts octahedral molecular geometry, with two bridging fluoride ligand In coordination chemistry, a ligand is an ion or molecule ( functional group) that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's elec ...s. Ruthenium pentafluoride reacts with iodine to give ruthenium(III) fluoride. References {{Fluorides Ruthenium compounds Fluorides Platinum group halides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhenium Pentafluoride
Rhenium pentafluoride is a binary inorganic compound of rhenium and fluorine with the chemical formula . This is a salt of rhenium and hydrofluoric acid. Synthesis Rhenium pentafluoride can be synthesised by the reduction of rhenium hexafluoride with hydrogen, rhenium, or tungsten: :: :: :: Physical properties Rhenium pentafluoride forms yellow-green crystals of orthorhombic crystal system, cell parameters ''a'' = 0.57 nm, ''b'' = 1.723 nm, ''c'' = 0.767 nm. Rhenium pentafluoride reacts with water. Rhenium pentafluoride is volatile. The compound consists of dimer Dimer may refer to: * Dimer (chemistry), a chemical structure formed from two similar sub-units ** Protein dimer, a protein quaternary structure ** d-dimer * Dimer model, an item in statistical mechanics, based on ''domino tiling'' * Julius Dimer ...s of composition . References {{fluorides Fluorides Rhenium compounds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Technetium Pentafluoride
Technetium pentaluoride is a binary inorganic chemical compound of technetium metal and fluorine with the chemical formula . Synthesis The compound can be synthesised by heating of technetium powder in a jet of fluorine diluted with nitrogen: :: Another way to prepare it is the effect of iodine on technetium hexafluoride solution in iodine pentafluoride: :: Physical properties Technetium pentafluoride forms yellow crystals of orthorhombic crystal system In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with .... It reacts with water, and is volatile. Chemical properties The compound is hydrolyzed by water, disproportionating to more stable technetium compounds: :: References {{fluorides Technetium compounds Fluorides Metal halides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
