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Time-resolved EPR observation of synthetic eumelanin-superoxide radical pairs

Antonio Toffoletti1, Fosca Conti, Tommaso Sandron

  • 1Department of Chemical Sciences, University of Padova, via Marzolo, 1-35131 Padova, Italy. antonio.toffoletti@.unipd.it

Chemical Communications (Cambridge, England)
|August 12, 2009
PubMed

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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...