Also contains definitions of: spin adduct, spin counting
In certain reactions in solution a @[email protected] @[email protected] will interact with a @[email protected] @[email protected] to form a more @P04516@ radical. The product radical accumulates to a concentration where detection and, frequently, identification are possible by EPR/ESR @[email protected] The key reaction is usually one of @[email protected]; the @[email protected] @[email protected] is said to be a 'spin trap' and the @[email protected] product radical is then the 'spin @[email protected]'. The procedure is referred to as spin @[email protected], and is used for @[email protected] reactions involving the intermediacy of @[email protected] radicals at concentrations too low for direct observation. Typical spin traps are C[email protected]@ and @[email protected], 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 @[email protected] 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.
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1166 [Terms] [Paper]