Abstract
Abstract The present study demonstrates the potential of two-dimensional exchange spectroscopy for the investigation of transient radicals. The appearance of cross peaks in a 2D plot unambiguously demonstrates the process of photoinduced interconversion of the neutral hydroxyanthroxyl radical (AQH·) into the anthrasemiquinone anion radical (AQ−·) by proton abstraction in the system anthraquinone/4-methyl-2.6-di-tert-butylphenol in 2-propanol. An analysis of the cross-peak pattern reveals the correlation between hyperfine lines of the parent and product radical and yields information about the assignment of coupling constants to molecular positions including their sign. The rate constant of interconversion k could also be determined by a variation of the mixing time Tm.
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