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{{Chembox |
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{{chembox |
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| Watchedfields = changed |
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| verifiedrevid = 443399432 |
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| ImageFile = Arsenic-tribromide-3D-balls.png |
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| verifiedrevid = 443401000 |
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| ImageFile = Arsenic-tribromide-3D-balls.png |
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| ImageSize = 200px |
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| ImageSize = |
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| ImageName = Ball and stick model of arsenic tribromide |
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| ImageName = Ball and stick model of arsenic tribromide |
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| PIN = Arsenic tribromide |
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| PIN = Arsenic tribromide |
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| SystematicName = Tribromoarsane |
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| SystematicName = Tribromoarsane |
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| OtherNames = Arsenic(III) bromide<br /> |
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| OtherNames = Arsenic(III) bromide<br /> |
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Arsenous bromide |
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Arsenous bromide, Arsenicum Bromatum, Tribromoarsine |
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| Section1 = {{Chembox Identifiers |
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|Section1={{Chembox Identifiers |
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| InChI1 = 1/AsBr3/c2-1(3)4 |
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| InChI1 = 1/AsBr3/c2-1(3)4 |
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| InChIKey1 = JMBNQWNFNACVCB-UHFFFAOYAH |
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| InChIKey1 = JMBNQWNFNACVCB-UHFFFAOYAH |
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| CASNo_Ref = {{cascite|correct|??}} |
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| CASNo = 7784-33-0 |
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| CASNo = 7784-33-0 |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| PubChem = 24569 |
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| UNII = 41CN475O7F |
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| PubChem_Ref = {{Pubchemcite}} |
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| ChemSpiderID = 22973 |
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| PubChem = 24569 |
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| ChemSpiderID = 22973 |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| EINECS = 232-057-4 |
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| RTECS = CG1375000 |
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| EINECS = 232-057-4 |
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| RTECS = CG1375000 |
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| StdInChI_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChI_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChI = 1S/AsBr3/c2-1(3)4 |
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| StdInChI = 1S/AsBr3/c2-1(3)4 |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey = JMBNQWNFNACVCB-UHFFFAOYSA-N |
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| StdInChIKey = JMBNQWNFNACVCB-UHFFFAOYSA-N |
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| SMILES = Br(Br)Br |
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| SMILES = Br(Br)Br |
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| InChI = 1S/AsBr3/c2-1(3)4 |
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| InChI = 1S/AsBr3/c2-1(3)4 |
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| InChIKey = JMBNQWNFNACVCB-UHFFFAOYSA-N}} |
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| InChIKey = JMBNQWNFNACVCB-UHFFFAOYSA-N}} |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = AsBr<sub>3</sub> |
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| Formula = {{chem2|AsBr3}} |
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| MolarMass = 314.634 g/mol |
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| MolarMass = 314.634 g/mol |
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| Appearance = white to pale yellow crystalline solid |
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| Appearance = white to pale yellow crystalline solid |
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| Density = 3.40 g/cm<sup>3</sup> |
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| Density = 3.54 g/cm<sup>3</sup> |
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| Solubility = decompose |
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| Solubility = soluble, partial hydrolysis indicated by fumes |
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| MeltingPt = 31.1 °C |
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| MeltingPtC = 31.1 |
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| MeltingPt_notes = |
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| BoilingPt = 221 °C |
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| RefractIndex = 2.3 |
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| BoilingPtC = 221 |
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| BoilingPt_notes = |
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| RefractIndex = 2.3 |
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| MagSus = -106.0·10<sup>−6</sup> cm<sup>3</sup>/mol |
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}} |
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| Section8 = {{Chembox Related |
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|Section3={{Chembox Hazards |
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| IDLH = Ca <ref name=PGCH>{{PGCH|0038}}</ref> |
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| OtherCpds = ]<br />] |
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| REL = Ca C 0.002 mg/m<sup>3</sup> <ref name=PGCH/> |
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| PEL = TWA 0.010 mg/m<sup>3</sup><ref name=PGCH/> |
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}} |
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|Section8={{Chembox Related |
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| OtherCompounds = ]<br />] |
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'''Arsenic tribromide''' is an ] with the formula {{chem2|]]}}, it is a bromide of arsenic. Arsenic is a chemical element that has the symbol As and atomic number 33. This pyramidal molecule is the only known ] arsenic bromide. {{chem2|AsBr3}} is noteworthy for its very high ] of approximately 2.3. It also has a very high ].<ref name=":0">CRC handbook of Chemistry and Physics, CRC Press</ref> The compound exists as colourless deliquescent crystals that fume in moist air. |
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==Preparation== |
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'''Arsenic tribromide''' is the ] with the formula ]]. This pyramidal molecule is the only known ] arsenic bromide. It is formed by the direct reaction of bromine and arsenic. AsBr<sub>3</sub> is noteworthy for its very high ] of approximately 2.3. It also has a very high ].<ref>CRC handbook of Chemistry and Physics, CRC Press</ref> |
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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: |
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{{chem2|2 As2O3 + 3 S + 6 Br2 → 4 AsBr3 + 3 SO2}} |
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Arsenic tribromide is a highly water soluble crystalline arsenic source for uses compatible with bromides and lower (acidic) pH. Most metal bromide compounds are water soluble for uses in water treatment, chemical analysis and in ultra high purity for certain crystal growth applications. Arsenic bromide is generally immediately available in most volumes.<ref name=":1">"Arsenic Tribromide" in Handbook of Preparative Inorganic Chemistry, 2nd ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 597.</ref> |
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It is soluble in ]s; ]; very soluble in ], ], ], ], ]s, and ]s. |
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==Bromides of arsenic== |
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==Bromides of arsenic== |
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AsBr<sub>5</sub> is not known, although the corresponding phosphorus compound PBr<sub>5</sub> is well characterized. AsBr<sub>3</sub> is the parent for a series of ] anionic bromoarsenates including <sup>2−</sup>, <sup>3−</sup>, and <sup>3−</sup>.<ref>Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.</ref> |
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{{chem2|AsBr5}} is not known, although the corresponding phosphorus compound {{chem2|PBr5}} is well characterized. {{chem2|AsBr3}} is the parent for a series of ] anionic bromoarsenates including {{chem2|(2-)}}, {{chem2|(3-)}}, and {{chem2|(3-)}}.<ref name=":2">Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. {{ISBN|0-12-352651-5}}.</ref> |
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Organoarsenic bromides, (CH<sub>3</sub>)<sub>2</sub>AsBr and (CH<sub>3</sub>)AsBr<sub>2</sub> are formed efficiently by the copper-catalyzed reaction of ] with hot arsenic metal. This synthesis is similar to the direct process used for the synthesis of methyl ]s. |
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Organoarsenic bromides {{chem2|(CH3)2AsBr}} and {{chem2|(CH3)AsBr2}} are formed efficiently by the ]-catalyzed reaction of ] with hot arsenic metal. This synthesis is similar to the direct process used for the synthesis of methyl ]s. |
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==Safety== |
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Arsenic tribromide is toxic, as are all arsenic compounds. |
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Arsenic tribromide is highly toxic. It is a ] and a ]. |
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==References== |
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==References== |
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{{Arsenic compounds}} |
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{{Arsenic compounds}} |
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{{Bromine compounds}} |
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{{inorganic-compound-stub}} |
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