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Three anthracene units and one or two electrons—where do these reside? Reduction of the new compound 1 with potassium in methyltetrahydrofuran (MTHF) furnishes 1⊕ ⊕/K⊕, in which the spin density is localized in the central anthracene fragment; in DME/HMPT, on the other hand, the spin density is delocalized over all anthracene fragments. In the case of the dianion 12 ⊕/2K⊕ in MTHF-glass one electron is contained in the central, and one in a terminal anthracene unit; in DME/HMPT-glass, another dianion is also formed. 16 ⊖ can be detected cyclovoltammetrically.
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Fiedler et al. (1986) studied this question.
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