Triplet excitons in isolated TCNQ˙– dimers (TCNQ = tetracyanoquinodimethane)
Abstract
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.