rhenium(IV) oxide
{{Chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 437313373
| ImageFile = Rhenium dioxide.jpg
| ImageFile1 = Rutile-unit-cell-3D-balls.png
| ImageCaption1 = {{Color box|#BFC3C6|border=darkgray}} Re {{Color box|#ee2010|border=darkgray}} O
| IUPACName = Rhenium(IV) oxide
| OtherNames = Rhenium dioxide
|Section1={{Chembox Identifiers
| Abbreviations =
| CASNo_Ref = {{cascite|correct|??}}
| CASNo = 12036-09-8
| EINECS = 234-839-0
| PubChem = 82847
| InChI = 1S/2O.Re
| RTECS =
| MeSHName =
| ChEBI =
| KEGG_Ref = {{keggcite|correct|kegg}}
| KEGG =
| SMILES = O=[Re]=O
}}
|Section2={{Chembox Properties
| Formula = ReO2
| MolarMass = 218.206 g/mol
| Appearance = gray orthorhombic crystals
{{cite book | last = Lide
| first = David R.
| year = 1998
| title = Handbook of Chemistry and Physics
| edition = 87
| publisher = CRC Press
| isbn = 0-8493-0594-2 | page = 484
| url = https://books.google.com/books?id=lFjg0L-uOxoC&q=%22Rhenium(IV)+oxide%22&pg=PT869
| accessdate = 2008-06-05
}}
| MeltingPt = decomposes at 1000 °C
{{cite book
| last1 = Perry
| first1 = Dale L.
| last2 = Phillips
| first2 = Sidney L.
| year = 1995
| title = Handbook of Inorganic Compounds
| location = San Diego
| publisher = CRC Press
| isbn = 0-8493-8671-3 | page = 328
| url = https://books.google.com/books?id=0fT4wfhF1AsC&q=%22Rhenium(IV)+oxide%22&pg=PA328
| accessdate = 2008-06-05
}}
| BoilingPt =
| Solubility = insoluble
| SolubleOther = insoluble
| Solvent = alkali
| pKa =
| pKb =
| MagSus = +44.0·10−6 cm3/mol
}}
|Section3={{Chembox Structure
| CrystalStruct = Orthorohmbic, oP12
| SpaceGroup = Pbcn, No. 60
}}
|Section7={{Chembox Hazards
| ExternalSDS = [https://www.sigmaaldrich.com/catalog/search/ProductDetail/ALDRICH/342254 Aldrich MSDS]
| MainHazards =
| NFPA-H = 1
| NFPA-F = 0
| NFPA-R = 0
| NFPA-S =
| HPhrases =
| PPhrases =
| GHS_ref =
| FlashPt =
| AutoignitionPt =
| ExploLimits =
| PEL =
}}
|Section8={{Chembox Related
| OtherAnions = Rhenium(VII) oxide
Rhenium(III) oxide
Rhenium(III) chloride
| OtherCations = manganese(IV) oxide
Technetium(IV) oxide
}}
}}
Rhenium(IV) oxide or rhenium dioxide is the inorganic compound with the formula ReO2. This gray to black crystalline solid is a laboratory reagent that can be used as a catalyst. It adopts the rutile structure.
Synthesis and reactions
It forms via comproportionation:G. Glemser "Rhenium (IV) Oxide" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1480.
:2 Re2O7 + 3 Re → 7 ReO2
Single crystals are obtained by chemical transport, using iodine as the transporting agent.:{{cite book | last1 = Rogers | first1 = D. B. | last2 = Butler | first2 = S. R. | last3 = Shannon | first3 = R. D. | year = 1972 | title = Single Crystals of Transition-Metal Dioxides | series = Inorganic Syntheses | volume = XIII | pages = 135–145 | doi = 10.1002/9780470132449.ch27 | isbn = 9780470131725 }}
: ReO2 + I2 {{eqm}} ReO2I2
At high temperatures it undergoes disproportionation:
:7{{nbsp}}ReO2 → 2{{nbsp}}Re2O7 + 3{{nbsp}}Re
It forms rhenates with alkaline hydrogen peroxide and oxidizing acids.{{cite web |url=http://www.aaamolybdenum.com/RheniumDioxide.html |title=RHENIUM DIOXIDE - Manufacturer |publisher=Aaamolybdenum.com |accessdate=2012-08-06 |url-status=dead |archiveurl=https://web.archive.org/web/20030209232809/http://www.aaamolybdenum.com/RheniumDioxide.html |archivedate=2003-02-09 }} In molten sodium hydroxide it forms sodium rhenate:G. Glemser "Sodium Rhenate (IV)" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1483.
: 2{{nbsp}}NaOH + ReO2 → Na2ReO3 + H2O
References
{{reflist}}
{{Rhenium compounds}}
{{Oxides}}
{{DEFAULTSORT:Rhenium(Iv) Oxide}}