Peroxyacetyl nitrate

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Peroxyacetyl nitrate
IUPAC name nitroethaneperoxoate
Systematic name ethanoic nitric peroxyanhydride
Other names PAN peroxyacetyl nitrate α-oxoethylperoxylnitrate
Identifiers
CAS number	2278-22-0 Y
Jmol-3D images	Image 1
SMILES CC(OO[N+]([O-])=O)=O
InChI InChI=1/C2H3NO5/c1/h1H3
Properties
Molecular formula	C2H3NO5
Molar mass	121.05 g mol−1
Solubility in water	1.46 × 10 5 mg l−1 at 298 K
log P	−0.19
Vapor pressure	29.2 mmHg at 298 K
kH	0.000278 m³ atm mol−1 at 298 K
Atmospheric OH rate constant	10−13 cm³ molecule−1 s−1 at 298 K
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Peroxyacetyl nitrate is a peroxyacyl nitrate. It is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.

Peroxyacetyl nitrate, or PAN, is an oxidant more stable than ozone. Hence, it is better capable of long-range transport than ozone. It serves as a carrier for oxides of nitrogen (NOx) into rural regions and causes ozone formation in the global troposphere.

The formation of PAN on a secondary scale becomes an issue when ethanol is used as an automotive fuel. Acetaldehyde emissions increase, which subsequently react in the atmosphere to form smog. Whereas ethanol policies solve domestic oil supply problems, they drastically exacerbate air quality conditions.^{[citation needed]}

External links

• NIST WebBook page for peroxyacetyl nitrate

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