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A series of 1,1 -(2,4-di-X-benzene-1,3-diyl)bis[1-(4-Y-phenyl)-2-picrylhydrazine]s were prepared and oxidized to generate the corresponding bis-DPPH diradicals. No triplet species was observed for the compounds with X = H in the ESR measurement. Modification of the central benzene ring (X = Me) and N-phenyl group (Y = OMe, Ph, t-Bu) allowed the detection of their triplet diradicals. Especially,...
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