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Tribromide
Tribromide is the anion with the chemical formula Br3−, or salts containing it: * Tetrabutylammonium tribromide * Tetrabromophosphonium tribromide * Pyridinium perbromide Sodium and potassium tribromides can be prepared by reacting NaBr or KBr with aqueous bromine. : Br− + Br2 → Br3− Tribromide may also refer to binary chemical compounds containing three bromine atoms: * Aluminium tribromide, AlBr3 * Antimony tribromide, SbBr3 * Arsenic tribromide, AsBr3 * Bismuth tribromide, BiBr3 * Boron tribromide, BBr3 * Chromium tribromide, CrBr3 * Erbium tribromide, ErBr3 * Europium tribromide, EuBr3 * Ferric tribromide, FeBr3 * Gallium tribromide, GaBr3 * Gold tribromide, AuBr3 or Au2Br6 * Indium tribromide, InBr3 * Molybdenum tribromide, MoBr3 * Nitrogen tribromide, NBr3 * Phosphorus tribromide Phosphorus tribromide is a colourless liquid with the formula P Br3. The liquid fumes in moist air due to hydrolysis and has a penetrating odour. It is used in the labora ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tribromide Anion
Tribromide is the anion with the chemical formula Br3−, or salts containing it: * Tetrabutylammonium tribromide * Tetrabromophosphonium tribromide * Pyridinium perbromide Sodium and potassium tribromides can be prepared by reacting NaBr or KBr with aqueous bromine. : Br− + Br2 → Br3− Tribromide may also refer to binary chemical compounds containing three bromine atoms: * Aluminium tribromide, AlBr3 * Antimony tribromide, SbBr3 * Arsenic tribromide, AsBr3 * Bismuth tribromide, BiBr3 * Boron tribromide, BBr3 * Chromium tribromide, CrBr3 * Erbium tribromide, ErBr3 * Europium tribromide, EuBr3 * Ferric tribromide, FeBr3 * Gallium tribromide, GaBr3 * Gold tribromide, AuBr3 or Au2Br6 * Indium tribromide, InBr3 * Molybdenum tribromide, MoBr3 * Nitrogen tribromide, NBr3 * Phosphorus tribromide Phosphorus tribromide is a colourless liquid with the formula P Br3. The liquid fumes in moist air due to hydrolysis and has a penetrating odour. It is used in the labora ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphorus Tribromide
Phosphorus tribromide is a colourless liquid with the formula P Br3. The liquid fumes in moist air due to hydrolysis and has a penetrating odour. It is used in the laboratory for the conversion of alcohols to alkyl bromides. Preparation PBr3 is prepared by treating red phosphorus with bromine. An excess of phosphorus is used in order to prevent formation of PBr5: :2 P + 3 Br2 → 2 PBr3 Because the reaction is highly exothermic, it is often conducted in the presence of a diluent such as PBr3. Reactions Phosphorus tribromide, like PCl3 and PF3, has both properties of a Lewis base and a Lewis acid. For example, with a Lewis acid such as boron tribromide it forms stable 1 :1 adducts such as Br3B · PBr3. At the same time PBr3 can react as an electrophile or Lewis acid in many of its reactions, for example with amines. The most important reaction of PBr3 is with alcohols, where it replaces an OH group with a bromine atom to produce an alkyl bromide. All three bromides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boron Tribromide
Boron tribromide, BBr3, is a colorless, fuming liquid compound containing boron and bromine. Commercial samples usually are amber to red/brown, due to weak bromine contamination. It is decomposed by water and alcohols. Chemical properties Boron tribromide is commercially available and is a strong Lewis acid. It is an excellent demethylating or dealkylating agent for the cleavage of ethers, also with subsequent cyclization, often in the production of pharmaceuticals. The mechanism of dealkylation of tertiary alkyl ethers proceeds via the formation of a complex between the boron center and the ether oxygen followed by the elimination of an alkyl bromide to yield a dibromo(organo)borane. :ROR + BBr3 → RO+(−BBr3)R → ROBBr2 + RBr Aryl methyl ethers (as well as activated primary alkyl ethers), on the other hand are dealkylated through a bimolecular mechanism involving two BBr3-ether adducts. :RO+(−BBr3)CH3 + RO+(−BBr3)CH3→ RO(−BBr3) + CH3Br + RO+(BBr2)CH3 The di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold(III) Bromide
Gold(III) bromide is a dark-red to black crystalline solid.Macintyre, J. E. (ed.) ''Dictionary of Inorganic Compounds''; Chapman & Hall: London, 1992; vol. 1, pp. 121Greenwood, N.N.; Earnshaw, A. ''Chemistry of the Elements''; Butterworth-Heineman: Oxford,1997; pp. 1183-1185Cotton, F.A.; Wilkinson, G.; Murillo, C.A.; Bochmann, M. ''Advanced Inorganic Chemistry''; John Wiley & Sons: New York, 1999; pp. 1101-1102 It has the empirical formula , but exists primarily as a dimer with the molecular formula in which two gold atoms are bridged by two bromine atoms.Schulz, A.; Hargittai, M. '' Chem. Eur. J.'' 2001, vol. 7, pp. 3657-3670 It is commonly referred to as gold(III) bromide, gold tribromide, and rarely but traditionally auric bromide, and sometimes as digold hexabromide. As is similar with the other gold halides, this compound is unique for being a coordination complex of a group 11 transition metal that is stable in an oxidation state of +3 whereas copper or silver complexes pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bismuth Tribromide
Bismuth tribromide is an inorganic compound of bismuth and bromine with the chemical formula BiBr3. Preparation It may be formed by the reaction of bismuth oxide and hydrobromic acid. : Bismuth tribromide can also be produced by the direct oxidation of bismuth in bromine. : Structure Bismuth tribromide adopts two different structures in the solid state: a low-temperature Polymorphism (materials science), polymorph α-BiBr3 that is stable below 158 °C and a high-temperature polymorph β-BiBr3 that is stable above this temperature. Both polymorphs are monoclinic but α-BiBr3 is in space group ''P''21/a whereas β-BiBr3 is in ''C''2/m. α-BiBr3 consists of trigonal pyramidal molecular geometry, pyramidal molecules whereas β-BiBr3 is polymeric and adopts the aluminium chloride, AlCl3 structure. BiBr3 is the only Pnictogen, group 15 trihalide that can adopt both molecular and polymeric structures. Reactivity Bismuth bromide is highly water-soluble. It is a Lewis acid and acc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aluminium Tribromide
Aluminium bromide is any chemical compound with the empirical formula AlBrx. Aluminium tribromide is the most common form of aluminium bromide. It is a colorless, sublimable hygroscopic solid; hence old samples tend to be hydrated, mostly as aluminium tribromide hexahydrate (AlBr3·6H2O). Structure The dimeric form of aluminium tribromide (Al2Br6) predominates in the solid state, in solutions in noncoordinating solvents (e.g. CS2), in the melt, and in the gas phase. Only at high temperatures do these dimers break up into monomers: : Al2Br6 → 2 AlBr3 ΔH°diss = 59 kJ/mol The species aluminium monobromide forms from the reaction of HBr with Al metal at high temperature. It disproportionates near room temperature: :6/n " lBrsub>n" → Al2Br6 + 4 Al This reaction is reversed at temperatures higher than 1000 °C. Aluminium monobromide has been crystallographically characterized in the form the tetrameric adduct Al4Br4(NEt3)4 (Et = C2H5). This species is electronical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arsenic Tribromide
Arsenic tribromide is the inorganic compound with the formula As Br3. This pyramidal molecule is the only known binary arsenic bromide. AsBr3 is noteworthy for its very high refractive index of approximately 2.3. It also has a very high diamagnetic susceptibility. The compound exists as colourless deliquescent crystals that fume in moist air. Preparation Arsenic tribromide can be prepared by the direct bromination of arsenic powder. Alternatively, arsenic(III) oxide can be used as the precursor in the presence of elemental sulfur: :2 As2O3 + 3 S + 6 Br2 → 4 AsBr3 + 3 SO2 Bromides of arsenic AsBr5 is not known, although the corresponding phosphorus compound PBr5 is well characterized. AsBr3 is the parent for a series of hypervalent anionic bromoarsenates including s2Br8sup>2−, s2Br9sup>3−, and s3Br12sup>3−.Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. . Organoarsenic bromides, (CH3)2AsBr and (CH3)AsBr2 are formed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrabutylammonium Tribromide
Tetrabutylammonium tribromide, abbreviated to TBATB, is a pale orange solid with the formula [N(C4H9)4]Br3. It is a salt of the lipophilic tetrabutylammonium cation and the linear tribromide anion. The salt is sometimes used as a reagent used in organic synthesis as a conveniently weighable, solid source of bromine. Preparation The compound is prepared by treatment of solid tetra-n-butylammonium bromide, tetra-''n''-butylammonium bromide with bromine vapor: :[N(C4H9)4]Br + Br2 → [N(C4H9)4]Br3 Instead of bromine, tetra-''n''-butylammonium bromide can also be reacted with vanadium pentoxide and aqueous hydrogen peroxide, or alternatively with ceric ammonium nitrate. This molecule is commonly used as a catalyst in reactions involving the Fischer–Speier esterification mechanism and was heavily tested on by Dr Divyam Shard and Dr Arnav Mohammed, co-workers at Hustlers' University while working with Mr Atul Gowande. See also *Tribromide *Tetrabutylammonium triiodide Refe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphorus Heptabromide
Phosphorus heptabromide is an inorganic compound with the formula PBr7. It is one of the phosphorus bromides. At normal conditions, it forms red prismatic crystals. PBr7 can be prepared by the sublimation of a mixture of phosphorus pentabromide and bromine. :PBr5 + Br2 → PBr7 The structure consists of a PBr4+ cation paired with a tribromide (Br3–) anion, and the tribromide is non-symmetric. See also * Phosphorus tribromide Phosphorus tribromide is a colourless liquid with the formula P Br3. The liquid fumes in moist air due to hydrolysis and has a penetrating odour. It is used in the laboratory for the conversion of alcohols to alkyl bromides. Preparation PBr3 ... * Phosphorus pentabromide References Phosphorus bromides Polyhalides Phosphonium compounds {{inorganic-compound-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyridinium Perbromide
Pyridinium perbromide (also called pyridinium bromide perbromide, pyridine hydrobromide perbromide, or pyridinium tribromide) is an organic chemical composed of a pyridinium cation and a tribromide anion. It can also be considered as a complex containing pyridinium bromide—the salt of pyridine and hydrogen bromide—with an added bromine (Br2). The chemical is a solid whose reactivity is similar to that of bromine. It is thus a strong oxidizing agent used as a source of electrophilic bromine in halogenation reactions. The analogous quinoline compound behaves similarly. Preparation Pyridinium tribromide can be obtained by reacting pyridinium bromide with bromine or thionyl bromide. Properties Pyridinium tribromide is a crystalline red solid which is virtually insoluble in water. Use Pyridinium tribromide is used as a brominating agent of ketones, phenols, and ethers In organic chemistry, ethers are a class of compounds that contain an ether group—an oxygen atom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrogen Tribromide
Nitrogen tribromide is a chemical compound with the formula NBr3. It is extremely explosive in its pure form, even at −100 °C, and was not isolated until 1975. It is a deep-red and volatile solid. Preparation NBr3 was first prepared by reaction of bistrimethylsilylbromamine ( bis(trimethylsilyl)amine bromide) with bromine monochloride (with trimethylsilyl chloride as byproduct) at −87 °C according to the following equation: :(Me3Si)2NBr + 2 BrCl → NBr3 + 2 where "Me" is a methyl group. Reactions Nitrogen tribromide reacts instantly with ammonia in dichloromethane solution at −87 °C to yield NBrH2. :NBr3 + 2 NH3 → 3 NH2Br It also reacts with iodine in dichloromethane Dichloromethane (DCM or methylene chloride, methylene bichloride) is an organochlorine compound with the formula . This colorless, volatile liquid with a chloroform-like, sweet odour is widely used as a solvent. Although it is not miscible wit ... solution at −87 °C to pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indium Tribromide
Indium(III) bromide, (indium tribromide), InBr3, is a chemical compound of indium and bromine. It is a Lewis acid and has been used in organic synthesis. Structure It has the same crystal structure as aluminium trichloride, with 6 coordinate indium atoms."Indium: Inorganic chemistry", D.G Tuck, ''Encyclopedia of Inorganic Chemistry'' Editor R Bruce King (1994) John Wiley and Sons When molten it is dimeric, In2Br6, and it is predominantly dimeric in the gas phase. The dimer has bridging bromine atoms with a structure similar to dimeric aluminium trichloride Al2Cl6. Preparation and reactions It is formed by the reaction of indium and bromine.Egon Wiberg, Arnold Frederick Holleman (2001) ''Inorganic Chemistry'', Elsevier InBr3 forms complexes with 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 o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
