Table 1

NO and related species

Common NameAbbreviation/Symbol
Nitric oxidea NO
Nitroxyl anionNO
Nitrosoniumb NO+
Nitrogen dioxideNO2
Superoxidec O2
Nitrite + nitrated NOx
  • 1-a The unpaired electron does not need to be written into the abbreviation for NO as NO · 

  • 1-b Although some compounds act as donors of a species with an NO+-like character (i.e., are nitrosating agents), NO+ does not exist as such in aqueous solution.

  • 1-c NO reacts with the superoxide anion to form peroxynitrite.

  • 1-d In some conditions, S-nitrosothiols may also contribute to the NOx measured by chemiluminescence.