Isomeric Identification of the Nitroindole Chromophore in Indole + NO3 Organic Aerosol

• Published in: ACS Physical Chemistry Au Vol. 4; no. 5; pp. 568 - 574
• Main Authors: Dalton, Avery B., Wingen, Lisa M., Nizkorodov, Sergey A.
• Format: Journal Article
• Language: English
• Published: American Chemical Society 25.09.2024
• Subjects: secondary organic aerosol; brown carbon; nitroaromatic compounds; indole; nitrate radical

Oxidation of indole by nitrate radical (NO3) was previously proposed to form nitroindole, largely responsible for the brown color of indole secondary organic aerosol (SOA). As there are seven known nitroindole isomers, we used chromatographic separation to show that a single nitroindole isomer is pr...