Abstract
The EPR spectra of a flexible nitroxide triradical are recorded in a large temperature range. A detailed analysis of the spectral features is performed and the spectra are compared with computer simulations. An excellent agreement with the experimental spectra is obtained by using a dynamic model based on the conformation interconversion of different molecular structures, characterized by the electron exchange interactions between pairs of free radicals. The energy barrier for the interconversion process and the temperature variation of the constant for the equilibrium among the conformations have been obtained. The results show that EPR spectra of nitroxide triradicals spin labelled polymers could be of valuable use for studying subtle details of molecular dynamics.
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Corvaja, C., De Marchi, M. & Toffoletti, A. Conformational dynamics of triradical nitroxides as studied by EPR. Appl. Magn. Reson. 12, 1–14 (1997). https://doi.org/10.1007/BF03161987
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DOI: https://doi.org/10.1007/BF03161987