In the solid-state a monomethine cyanine TCNQ˙– salt and an 18-crown-6 K+ TCNQ˙– complex both contain isolated, vertically stacked, TCNQ dimers which, despite the fundamentally different nature and location of the two cations, both show evidence for thermally excited triplet excitons.
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Grossel et al. (1990) studied this question.
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