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1,1 -(p- or m-Phenylene)bis(2,4,6-triphenylpyridinyl) diradical were prepared by the reduction of the corresponding dications. The plots of the ESR signal intensity vs. 1/T show that both the p- and m-diradicals are singlet in the ground state with a singlet-triplet energy gap of 51 cal/mol for the p-isomer and 44 cal/mol for the m-isomer.
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