Gold(III) oxide

{{chembox

| Verifiedfields = changed

| Watchedfields = changed

| verifiedrevid = 433168896

| ImageFile = Au2O3structure.jpg

| IUPACName = Gold(III) oxide

| OtherNames = Gold trioxide, Gold sesquioxide, Auric oxide

|Section1={{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|??}}

| CASNo = 1303-58-8

| ChemSpiderID = 144478

| EC_number = 215-122-1

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = LW5Y686RUP

| PubChem = 164805

| SMILES = [O-2].[O-2].[O-2].[Au+3].[Au+3]

| InChI = InChI=1S/2Au.3O/q2*+3;3*-2

| InChIKey = DDYSHSNGZNCTKB-UHFFFAOYSA-N

}}

|Section2={{Chembox Properties

| Formula = Au₂O₃

| MolarMass = 441.93

| Appearance = red-brown solid

| Density = 11.34 g/cm³ at 20 °C{{cite journal| doi=10.1107/S0567740879006622| title=Gold(III) oxide| year=1979| author=Jones, P. G.| journal=Acta Crystallographica Section B| volume=35| pages=1435| last2=Rumpel| first2=H.| last3=Schwarzmann| first3=E.| last4=Sheldrick| first4=G. M.| last5=Paulus| first5=H.| issue=6| url=https://link.springer.com/article/10.1007%2FBF03215453}}

| MeltingPtC = 298

| MeltingPt_notes =

| MeltingPt_ref ={{cite journal | last1=Kawamoto | first1=Daisuke | last2=Ando | first2=Hiroaki | last3=Ohashi | first3=Hironori | last4=Kobayashi | first4=Yasuhiro | last5=Honma | first5=Tetsuo | last6=Ishida | first6=Tamao | last7=Tokunaga | first7=Makoto | last8=Okaue | first8=Yoshihiro | last9=Utsunomiya | first9=Satoshi | last10=Yokoyama | first10=Takushi | title=Structure of a Gold(III) Hydroxide and Determination of Its Solubility | journal=Bulletin of the Chemical Society of Japan | publisher=The Chemical Society of Japan | volume=89 | issue=11 | date=2016-11-15 | issn=0009-2673 | doi=10.1246/bcsj.20160228 | pages=1385–1390| doi-access=free }}

| BoilingPt =

| Solubility = insoluble in water, soluble in hydrochloric and nitric acid

}}

|Section3={{Chembox Structure

| CrystalStruct = Orthorhombic, oF40

| SpaceGroup = = Fdd2, No. 43

}}

|Section7={{Chembox Hazards

| GHS_ref=[https://pubchem.ncbi.nlm.nih.gov/compound/164805#section=Safety-and-Hazards]

| GHSPictograms = {{GHS07}}

| GHSSignalWord = Warning

| HPhrases = {{H-phrases|315|319}}

| PPhrases = {{P-phrases|264|264+265|280|302+352|305+351+338|321|332+317|337+317|362+364}}

| MainHazards =

| NFPA-H = 1

| NFPA-F = 0

| NFPA-R = 0

}}

}}

Gold(III) oxide (Au₂O₃) is an inorganic compound of gold and oxygen with the formula Au₂O₃. It is a red-brown solid that decomposes at 298 °C.{{Greenwood&Earnshaw}}

According to X-ray crystallography, Au{{sub|2}}O{{sub|3}} features square planar gold centers with both 2- and 3-coordinated oxides. The four Au-O bond distances range from 193 to 207 picometers. The crystals can be prepared by heating amorphous hydrated gold(III) oxide with perchloric acid and an alkali metal perchlorate in a sealed quartz tube at a temperature of around 250 °C and a pressure of around 30 MPa.{{cite journal|doi=10.1007/BF03215453|format=open access|title=Gold(III) oxide and oxychloride|journal=Gold Bulletin|volume=13|issue=2|pages=56|year=1980|last1=Jones|first1=Peter G.|last2=Rumpel|first2=Horst|last3=Sheldrick|first3=George M.|last4=Schwarzmann|first4=Einhard|doi-access=free}}