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| ImageFileL1 = Rhenium-trioxide-unit-cell-3D-balls-B.png |
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| verifiedrevid = 432110388 |
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| ImageFileR1 = REO3.JPG |
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| Name = |
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| IUPACName = Rhenium trioxide |
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| ImageFileL1 = Rhenium-trioxide-unit-cell-3D-balls-B.png |
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| OtherNames = Rhenia |
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| ImageFileR1 = REO3.JPG |
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| Section1 = {{Chembox Identifiers |
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| IUPACName = Rhenium trioxide |
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| OtherNames = Rhenia |
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| SystematicName = |
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| Section1 = {{Chembox Identifiers |
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| CASNo_Ref = {{cascite|correct|??}} |
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| CASNo = 1314-28-9 |
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| CASNo = 1314-28-9 |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| PubChem = |
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| SMILES = |
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| UNII = FET0Y2C413 |
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| PubChem = 102110 |
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| EINECS = 215-228-8 |
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| SMILES = O=(=O)=O |
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| InChI = 1S/3O.Re |
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| Section2 = {{Chembox Properties |
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| Formula = ReO<sub>3</sub> |
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| Formula = ReO<sub>3</sub> |
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| MolarMass = 234.205 |
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| MolarMass = 234.205 g/mol |
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| Appearance = Deep red crystals |
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| Appearance = Deep red crystals |
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| Density = 6.92 g/cm<sup>3</sup> |
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| Density = 6.92 g/cm<sup>3</sup> |
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| MeltingPt = 400 °C (decomposes) |
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| MeltingPtC = 400 |
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| MeltingPt_notes = (decomposes) |
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| RefractIndex = 1.68 |
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| RefractIndex = 1.68 |
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| MagSus = +16.0·10<sup>−6</sup> cm<sup>3</sup>/mol |
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| CrystalStruct = Cubic, ] |
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| CrystalStruct = Cubic, ] |
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| SpaceGroup = P''m<span style="text-decoration: overline">3</span>m'', SpaceGroup = 221 |
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| SpaceGroup = P''m<span style="text-decoration: overline">3</span>m'', No. 221 |
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| LattConst_a = 374.8 pm |
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'''Rhenium trioxide''' (''rhenium(VI) oxide'', '''ReO<sub>3</sub>''') is a red solid with a metallic lustre. It is the only stable ] of the Group 7 elements (], ], ]). |
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'''Rhenium trioxide''' or '''rhenium(VI) oxide''' is an ] with the formula ReO<sub>3</sub>. It is a red solid with a metallic lustre that resembles ] in appearance. It is the only stable ] of the Group 7 elements (], ], ]). |
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==Structure== |
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Rhenium oxide forms crystals with a ] ] ], with a ] of 3.742 ] (374.2 ]). The structure of ReO<sub>3</sub> is similar to the ] structure (ABO<sub>3</sub>), without the large A cation at the centre of the unit cell. Each rhenium atom is surrounded by six oxygen atoms, forming a ReO<sub>6</sub> ]. These octahedra share corners to form the 3-dimensional structure<ref>S.J. Heyes (2000) Department of Chemistry, University of Oxford.</ref>. |
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==Preparation and structure== |
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Upon viewing a unit cell of ReO<sub>3</sub>, one can see that it is composed of eight ⅛ fragments of rhenium atoms, and twelve ¼ fragments of oxygen atoms. These numbers reduce to 1 Re and 3 O, hence the formula of ReO<sub>3</sub>. The coordination number of Re in this compound is 6 because each rhenium atom has six neighbouring oxygen atoms which bear opposite charge. The coordination number of O in this compound is 2 because each oxygen atom has 2 neighbouring Re atoms of opposite charge. |
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Rhenium trioxide can be formed by reducing ] with ] at 200 °C or elemental ] at 400 °C.<ref>H. Nechamkin, C. F. Hiskey, "Rhenium(VI): Oxide (Rhenium Trioxide)" Inorganic Syntheses, 1950 Volume 3, pp. 186-188. {{doi|10.1002/9780470132340.ch49}}</ref> |
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:Re<sub>2</sub>O<sub>7</sub> + CO → 2 ReO<sub>3</sub> + CO<sub>2</sub> |
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:3 Re<sub>2</sub>O<sub>7</sub> + Re → 7 ReO<sub>3</sub> |
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Re<sub>2</sub>O<sub>7</sub> can also be reduced with ].<ref name=Glemser/> |
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Rhenium trioxide crystallizes with a ] ] ], with a ] of 3.742 ] (374.2 ]). The structure of ReO<sub>3</sub> is similar to that of ] (ABO<sub>3</sub>), without the large A cation at the centre of the unit cell. Each rhenium center is surrounded by an ] defined by six oxygen centers. These octahedra share corners to form the 3-dimensional structure. The coordination number of O is 2, because each oxygen atom has 2 neighbouring Re atoms.<ref name="G&E1047">{{Greenwood&Earnshaw}}, p. 1047.</ref> |
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==Properties== |
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==Properties== |
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===Physical properties=== |
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ReO<sub>3</sub> is unusual for an oxide because it exhibits very low ]. It behaves more like a ] in that its resistivity decreases as its temperature decreases. At 300 ], its resistivity is 100.0 ], whereas at 100 K, this decreases to 6.0 nΩ·m, 17 times less than at 300 K.<ref name="G&E1047"/> |
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ReO<sub>3</sub> is unusual for an oxide because it exhibits very low ]. It behaves like a ] in that its resistivity decreases as its temperature decreases. At 300 ], its resistivity is 100.0 ], whereas at 100 K, this decreases to 6.0 nΩ·m, 17 times less than at 300 K.<ref name="G&E1047" /> |
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=== Chemical properties === |
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==Preparation== |
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Rhenium trioxide is insoluble in water, as well as dilute acids and bases. Heating it in base results in ] to give {{Chem|ReO|2}} and {{Chem|ReO|4|-}}, while reaction with acid at high temperature affords {{Chem|Re|2|O|7}}. In concentrated nitric acid, it yields ]. |
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Rhenium trioxide can be formed by reducing ] with ]<ref name="G&E1047">{{Greenwood&Earnshaw}}, p. 1047.</ref>: |
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Upon heating to 400 °C under vacuum, it undergoes ]:<ref name="Glemser">{{cite book|author1=O. Glemser|author2=R. Sauer|chapter=Rhenium(VI) Oxide|title=Handbook of Preparative Inorganic Chemistry, 2nd Ed. |editor=G. Brauer|publisher=Academic Press|year=1963|place=NY, NY|volume=2pages=1482}}</ref> |
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: 3 ReO<sub>3</sub> → Re<sub>2</sub>O<sub>7</sub> + ReO<sub>2</sub> |
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Rhenium trioxide can be ] to give ]:<ref>{{cite book|author1=O. Glemser|author2=R. Sauer|chapter=Rhenium (VII) Oxychloride|title=Handbook of Preparative Inorganic Chemistry, 2nd Ed. |editor=G. Brauer|publisher=Academic Press|year=1963|place=NY, NY|volume=2pages=1480}}</ref> |
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:Re<sub>2</sub>O<sub>7</sub> + CO → 2 ReO<sub>3</sub> + CO<sub>2</sub> |
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:{{chem2|2 ReO3 + Cl2 -> 2 ReO3Cl}} |
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==Uses== |
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===Hydrogenation catalyst=== |
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Rhenium trioxide finds some use in ] as a ] for ].<ref>{{cite book|last1=Nishimura|first1=Shigeo|title=Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis|date=2001|publisher=Wiley-Interscience|location=New York|isbn=9780471396987|pages=408|edition=1st|url=https://books.google.com/books?id=RjZRAAAAMAAJ&q=0471396982}}</ref> |
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==References== |
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==References== |
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{{reflist}} |
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{{reflist}} |
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{{Rhenium compounds}} |
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{{Rhenium compounds}} |
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{{Oxides}} |
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{{inorganic-compound-stub}} |
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