carbon tetroxide

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{{Chembox

| ImageFileL1 = Carbon tetroxide.svg

| ImageFileR1 = Chemfm carbon tetroxyde.svg

| IUPACName = C_2v isomer:

• 1,2,3-Trioxetan-4-one
• Oxygen carbonate
• Monooxygen carbonate

D_2d isomer:

• Carbon diperoxide

| OtherNames = C_2v isomer:

• 4-Trioxetanone
• Trioxetan-4-one

D_2d isomer:

• 1,2,4,5-Tetraoxaspiro[2.2]pentane

|Section1={{Chembox Identifiers

| CASNo = 853179-44-9

| CASNo_Ref = {{cascite|correct|CAS}}

| PubChem = 22321311

| SMILES = O=C1OOO1

| StdInChI=1S/CO4/c2-1-3-5-4-1

| StdInChIKey = ITOJEBDYSWRTML-UHFFFAOYSA-N

}}

|Section2={{Chembox Properties

| C=1 | O=4

| Appearance =

| Density =

| MeltingPt =

| BoilingPt =

| Solubility = }}

|Section3={{Chembox Hazards

| MainHazards =

| FlashPt =

| AutoignitionPt = }}

}}

Carbon tetroxide or Oxygen carbonate (in its C_2v isomer) is a highly unstable oxide of carbon with formula {{chem|CO|4}}. It was proposed as an intermediate in the O-atom exchange between carbon dioxide ({{chem|CO|2}}) and oxygen ({{chem|O|2}}) at high temperatures.{{ cite journal |author1=Yeung, L. Y. |author2=Okumura, M. |author3=Paci, J. T. |author4=Schatz, G. C. |author5=Zhang, J. |author6=Minton, T. K. | title = Hyperthermal O-Atom Exchange Reaction O₂ + CO₂ through a CO₄ Intermediate | journal = Journal of the American Chemical Society | year = 2009 | volume = 131 | issue = 39 | pages = 13940–13942 | doi = 10.1021/ja903944k | pmid=19743846|url=https://authors.library.caltech.edu/16457/2/ja903944k_si_001.pdf }} The C_2v isomer, which is 138 kJ mol⁻¹ more stable than the D_2d isomer, was first detected in electron-irradiated ices of carbon dioxide via infrared spectroscopy.{{cite journal |first1= Corey S. |last1= Jamiesona |first2= Alexander M. |last2= Mebelb |first3= Ralf I. |last3= Kaiser |title= Novel Detection of the C_2v isomer of carbon tetraoxide (CO₄ |journal= Chemical Physics Letters |volume= 440 |year= 2007 |issue= 1–3 |pages= 105–109 |doi= 10.1016/j.cplett.2007.04.043 |bibcode= 2007CPL...440..105J }}

File:Carbon tetroxide D2d.svg

The isovalent carbon tetrasulfide CS₄ is also known from inert gas matrix. It has D_2d symmetry with the same atomic arrangement as CO₄ (D_2d).{{cite journal|last1=Maity|first1=Surajit|last2=Kim|first2=Y.S.|last3=Kaiser|first3=Ralf I.|last4=Lin|first4=Hong Mao|last5=Sun|first5=Bian Jian|last6=Chang|first6=A.H.H.|title=On the detection of higher order carbon sulfides (CS_x; x=4–6) in low temperature carbon disulfide ices|journal=Chemical Physics Letters|date=July 2013|volume=577|pages=42–47|doi=10.1016/j.cplett.2013.05.039|bibcode=2013CPL...577...42M}}

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