Investigation of Radical Pairs in Micelles Using Spin Polarization Techniques

Abstract

Micelles represent a simplified model of biological membranes; therefore significant effort is devoted to establish their properties and structure. The micelles can serve as “limited volume micro reactors” for radical reactions. In micelles partners of radical pair (RP) during their lifetime are separated by a few angstroems, and, hence, electron exchange interaction as well as spin selective reaction rate significantly affect magnetic field effects. A large number of studies published during the last few years report the observation and investigation of the magnetic field and magnetic isotope effects, very strong nuclear and electron spin polarization and other phenomena for the radical pairs confined within micelles [1–15]. Investigation of the micellized radical pairs attracts significant attention since the intersystem crossing in such RPs is critically affected by the exchange interaction and electron spin relaxation. This opens up the possibility to study both the exchange interaction and its influence on the intersystem crossing of RPs. The spin dynamics and chemical kinetics of micellized RPs have been studied by a number of techniques, e.g. Magnetic field Reaction Yield (MARY) [3], Time Resolved Electron Spin Resonance (TR ESR) [5, 7], Chemically Induced Dynamic Nuclear Polarization (CIDNP) [8], Reaction Yield Detected Magnetic Resonance (RYDMR)[3, 9], Product Yield Electron Spin Resonance (PYESR) [10, 11], Stimulated Nuclear Polarization (SNP) [12–18], CIDNP with the fast Switching of External Magnetic Field (SEMF CIDNP) [26, 27],etc.KeywordsSodium Dodecyl SulphateRadical PairDynamic Nuclear PolarizationEscape RateRotational Correlation TimeThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.