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Phylloquinone biradical triplet species were generated by 300nm irradiation of frozen (77K) solutions or by treatment with AlCl 3 . The shape of the (Δm s =1) electron paramagnetic resonance (EPR) signal of the triplet is axially symmetric (E=0) with D=19+/-0.5mT for photo-induced and D=11.2+/-0.5mT for chemically induced radicals. A half-field signal (Δm s =2) in the region...
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