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Dynamic Aspects of Cyclodextrin Host-Guest Inclusion as Studied by an EPR Spin-Probe Technique
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1999
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EngineeringPhysicsDynamic AspectsNatural SciencesRadical (Chemistry)Inclusion PhenomenaEpr Spin-probe TechniqueCyclodextrin Host-guest InclusionPhysical ChemistryOrganic ChemistryReaction IntermediateEpr ParametersMolecular AggregateChemistryQuantum ChemistrySelective Line BroadeningBiophysicsHost-guest Chemistry
Major changes in the EPR parameters of benzyl tert-butyl nitroxide and other dialkyl nitroxides on complexation by cyclodextrins (CDs) make these radicals particularly suitable probes for studying inclusion phenomena, because the signals for the free and included species are well separated. Furthermore, selective line broadening of the EPR spectra enables the kinetics of inclusion to be investigated [Eq. (a)].