Arsenic tribromide

Arsenic tribromide (arsenic(III) bromide), AsBr, is similar to the trichloride. The dielectric constant at 35°C is 8.33. The compound is usually made by treating arsenic with a solution of bromine in carbon disulfide. 

ARSENIC TRIBROMIDE ARSENIC TRICHLORIDE ARSENIC TRIFLUORIDE ARSENIC PENTAFLUORIDE ARSINE... 

Similarly, arsenic tribromide AsBrs forms when the trioxide reacts with bromine vapors. Reaction with concentrated HCI under heating produces arsenic trichloride. 

Ammino-derivatives of organic bases are known, such as tetra-ethylamino-arsenic tribromide, AsBr3.4(C2H6NH2).H20, and trianilino-arsenic tribromide, AsBr38(C6H6NH2).H20.2... 

Arsenic tribromide [82868-10-8] M 394.6, m 89 /llnini, 221 /760nini. Distd under vacuum. 

Arsenic compds have been used in some pyrotechnic compns (see Arsenic Disulfide and Arsenic Trisulfide described under Sulfides) and as chemical warfare agents (see Arsenic Tribromide described under... 

Arsenic Pentasuifide. See under Sulfides Arsenic Sulfides. See under Sulfides Arsenic Tribromide. See under Bromides Arsenic Trichloride. See under Chlorides Arsenic Trioxide. See under Oxides Arsenic Trisulfide. See under Sulfides... 

Tellurium tetrabromide is amphoteric in fused arsenic tribromide, from which complex bromides such as [(Et)4N]2TeBr6 and ammine adducts such as TeBr4-2PhNMe2 have been obtained. Addition compounds with pyridine, tetramethylthiourea and piperazine have also been reported.38,39 Alkali metal Salts such as TeBr4-2CsCl and the full brominated complexes of the type M2TeBr6 and M2PoBrs are also known. 

The halides, GaQs, AlBrs, A1C13, and FeCl3, very probably also exist in dimeric form. With these halides, however, the complexation reaction with the azide is the fast step so that no square-root term is found in the kinetic equation. Arsenic trichloride, arsenic tribromide, phosphorus trichloride, and phosphorus pentachloride were without effect on the rate of decomposition of benzoyl azide. Finally, the authors have observed that the catalytic influence of boron tribromide was much higher than all the other halides. Its rate constant was estimated to be about 18 times larger than that for gallium chloride. 

Arsenic Trifluoride, AsF3, is formed when fluorine reacts with arsenic trichloride 1 or with the arsenides of the alkali or alkaline earth metals 2 by the action of anhydrous hydrofluoric acid or of acid fluorides on arsenious oxide 3 by the action of certain metallic fluorides, for example silver or lead fluoride on arsenic trichloride,4 or of ammonium fluoride on arsenic tribromide B and by the action of iodine pentafluoride on arsenic.6... 

Arsenic Tribromide, AsBr3, was first obtained in 1828 by Sdrullas,6 who added dry powdered arsenic in small quantities to... 

Physical Properties.—Arsenic tribromide is a solid at ordinary temperatures, crystallising in beautiful colourless rhombic prisms6 which possess a feebly aromatic odour 7 and are stable in dry air. In the presence of moisture slight fuming occurs. The crystals melt sharply at 31° C.8 The density 9 at 15° C. is 3-66 after fusion and resolidification, the product has density 3-54 at 25° C.10 The density of the liquid at various temperatures may be obtained from the expression 11... 

Arsenic tribromide dissolves in many organic liquids,15 such as carbon disulphide, methylene iodide16 and benzene in the last named the decomposition voltage is 0-50 volt.17 In solutions in diethyl ether18 the electrical conductance at 18° C. rapidly increases with increase in the bromide concentration up to 95 per cent., after which it quickly falls to... 

Arsenic tribromide is itself a good solvent for certain halides.5 The following freezing points and densities at 15° C. of saturated solutions have been determined ... 

Arsenic triiodide also dissolves, the saturated solution at 15° C. having density 3-661. Other soluble halides are potassium bromide, anhydrous ferric and aluminium chlorides 6 and tetramethyl ammonium iodide but the iodides of rubidium, cadmium, manganese and cobalt, also mercuric and stannic iodides, and cobalt and stannic bromides, are insoluble or only very slightly soluble in arsenic tribromide. The liquid also dissolves phosphoryl bromide and, very slightly, ammonium thiocyanate. In the mixed solutions of halides, the components may react chemically (cf. p. 106), but such is not always the case for example, with antimony tribromide a continuous series of solid solutions is formed.7... 

Chemical PropeHies.—Arsenic tribromide reacts with water in small quantity to form the oxybromide, AsOBr in larger quantity arsenious and hydrobromic acids are formed.8 One part of the tribromide dissolves in three parts of boiling water,9 and on cooling the solution deposits crystals of arsenious oxide. The tribromide is less soluble in aqueous hydrobromic acid. It dissolves in bromine, but does not combine... 

Arsenic Oxybromide (Arsenyl Bromide), AsOBr, maybe prepared14 by dissolving arsenious oxide in molten arsenic tribromide and distilling off excess of the latter the remaining liquid separates into two layers, the upper one consisting of the oxybromide and the low er one a mixture... 

This procedure can also be used for arsenic tribromide 17g of bromine and 7 hours heating are required until the the condensing vapors are colorless. 

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