Preferred Label : spin trapping;
IUPAC definition : In certain reactions in solution a transient radical will interact with a diamagnetic
reagent to form a more persistent radical. The product radical accumulates to a concentration
where detection and, frequently, identification are possible by EPR/ESR spectroscopy.
The key reaction is usually one of attachment; the diamagnetic reagent is said to
be a 'spin trap' and the persistent product radical is then the 'spin adduct'. The
procedure is referred to as spin trapping, and is used for monitoring reactions involving
the intermediacy of reactive radicals at concentrations too low for direct observation.
Typical spin traps are i C /i -nitroso compounds and nitrones, to which reactive
radicals will rapidly add to form nitryl radicals. A quantitative development, in
which essentially all reactive radicals generated in a particular system are intercepted,
has been referred to as 'spin counting'. Spin trapping has also been adapted to the
interception of radicals generated in both gaseous and solid phases. In these cases
the spin adduct is in practice transferred to a liquid solution for observation in
order to facilitate interpretation of the EPR/ESR spectra of the radicals obtained.;
Origin ID : S05878;
Automatic exact mappings (from CISMeF team)
- See also
In certain reactions in solution a transient radical will interact with a diamagnetic
reagent to form a more persistent radical. The product radical accumulates to a concentration
where detection and, frequently, identification are possible by EPR/ESR spectroscopy.
The key reaction is usually one of attachment; the diamagnetic reagent is said to
be a 'spin trap' and the persistent product radical is then the 'spin adduct'. The
procedure is referred to as spin trapping, and is used for monitoring reactions involving
the intermediacy of reactive radicals at concentrations too low for direct observation.
Typical spin traps are i C /i -nitroso compounds and nitrones, to which reactive
radicals will rapidly add to form nitryl radicals. A quantitative development, in
which essentially all reactive radicals generated in a particular system are intercepted,
has been referred to as 'spin counting'. Spin trapping has also been adapted to the
interception of radicals generated in both gaseous and solid phases. In these cases
the spin adduct is in practice transferred to a liquid solution for observation in
order to facilitate interpretation of the EPR/ESR spectra of the radicals obtained.
