What molecule am I?
Peroxyacetyl nitrate is an unstable, highly oxygenated compound that exists only in the atmosphere. It is a key intermediate in the formation of the air pollutant ozone.
In December 2019, Emily V. Fischer at Colorado State University (Fort Collins) was awarded the James B. Macelwane Medal at the fall meeting of the American Geophysical Union. The medal is awarded for 鈥渟ignificant contributions to the geophysical sciences by an outstanding early career scientist鈥�. Fischer鈥檚 current work explores the processes that redistribute anthropogenic reactive nitrogen to remote regions.
In Fischer鈥檚 nomination citation, Ronald C. Cohen at the University of California, Berkeley, wrote
PAN spreads throughout the lower regions of the atmosphere and decomposes to nitrogen oxides, and thus plays a part in the formation of ozone. Ozone higher up in the atmosphere protects us from harmful cosmic radiation, but in the troposphere, it is a harmful pollutant.
Although PAN is a hazardous substance, specific hazard information for it is not given here because it is not an article of commerce. It is an inhalation toxin and eye irritant; and it is extremely explosive in the liquid state.
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Peroxyacetyl nitrate
fast facts
| CAS Reg. No. | 2278-22-0 |
nomenclature | Peroxide, acetyl nitro |
| Empirical formula | C2H3NO5 |
| Molar mass | 121.05 g/mol |
| Appearance | Unstable liquid or gas |
| Boiling point | Decomposes upon heating |
| Water solubility | Decomposes |
MOTW update
Thiamethoxam, clothianidin, and imidacloprid were the Molecules of the Week for October 15, 2012, February 17, 2014, and August 25, 2014, respectively. They are nicotinoid pesticides that pose neurotoxic risks to humans and wildlife, especially honeybees. Nonetheless, in an interim decision announced in January, the US Environmental Protection Agency , with some restrictions yet to be announced. This action is in contrast to the European Commission鈥檚 2018 ban on these and other nicotinoids for outdoor use.
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