Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The univalent radical derived from peroxyacetic acid
Etymologies
Sorry, no etymologies found.
Examples
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The thing is that PAN and its constituents/products form a steady-state at constant temperature, with PAN existing in balance with peroxyacetyl and NO2.
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In the mid-1970s, PAN was discovered to thermally decompose, i.e. at elevated temperatures, it rapidly changed back to a peroxyacetyl radical and nitrogen dioxide.
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But this process is dominated by the behavior of peroxyacetyl radicals.
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By the same token, if something reduces the amount of peroxyacetyl, relative to other peroxy radicals, then PAN concentrations decline, NO2 comes back into the system, and ozone can increase.
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The asterisk * on the peroxyacetyl is one of the conventions used for indicating that it is a radical; it has an unpaired electron that plays well with others, especially if they also have an unpaired electron.
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Light causes biacetyl to break into two pieces, both acetyl radicals, and when there is any oxygen around, you get peroxyacetyl radicals.
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Add some nitrogen dioxide and you get peroxyacetyl nitrate PAN, which is biologically active.
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Faithful readers will be reminded of peroxyacetyl nitrate which was the first peroxyacyl nitrate PAN to be studied in smog chemistry, and it remains the most important.
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The resulting NO got sucked up by peroxyacetyl radicals that had been formed from the normal smog chemistry reactions from the acetaldehyde and the amount of PAN that was formed was a quantitative measure of O1d formation.
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And if all this sounds very productive, realize that I haven't even mentioned the work that I was doing with Whitten on the basic photochemistry of aromatic hydrocarbons, isoprene and other biogenics, and peroxyacetyl nitrate PAN.
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