A role played by a stable paramagnetic group that is attached to a part of a molecular entity whose microscopic environment is of interest and may be revealed by the electron spin resonance (ESR) spectroscopy.
| Member | Definition | Class |
|---|
| (1-oxyl-2,2,5,5-tetramethylpyrroline-3-methyl)methanethiosulfonate | An aminooxyl that is pyrroline substituted by an oxidanediyl group at position 1, by methyl groups at positions 2, 2, 5 and 5, and by a [(methylsulfonyl)sulfanyl]methyl group at position 3. It is a highly reactive thiol-specific spin label. | (1-oxyl-2,2,5,5-tetramethylpyrroline-3-methyl)methanethiosulfonate |
| 4-maleimido-2,2,6,6-tetramethylpiperidinooxyl | A member of the class of piperidines that is TEMPO carrying a maleimido group at position 4. | 4-maleimido-TEMPO |
| di-t-butyl nitroxide | An aminoxyl that is N-tert-butyl-2-methylpropan-2-amine carrying an oxidanediyl group at the nitrogen atom. | di-tert-butyl nitroxide |
| n-(1-oxyl-2,2,6,6-tetramethyl-4-piperidinyl)iodoacetamide | A piperidinecarboxamide that is TEMPO carrying an 2-iodoacetamido group at position 4. | 4-(2-iodacetamido)-TEMPO |
| tempo carboxylic acid | A member of the class of aminoxyls that is TEMPO carrying a carboxy group at position 4. | 4-carboxy-TEMPO |