“…The formation of D/A systems using CTCs, depending on their p-acid or p-basic behaviour, can be achieved by interaction with small organic molecules, 8 with Lewis acids or bases, [15][16][17] by the stacked combination of CTCs with complementary p-acidic/p-basic properties, 4,18 and, finally, by clustering with soft metal cations such as (Cu(I), Ag(I), Tl(I)). 16,18,19 Remarkably, CTCs stack with small aromatic moieties, like benzene, 7 toluene, 7 mesitylene, 10 TCNQ and hexafluorobenzene (TetraCyaNoQuinodimethane), 8 and extended arene systems like naphthalene 6 and nitrofluorene 9 (see Scheme 1) to form isolated binary D/A or extended supramolecular structures of the type {ADAD} n , {ADDA} n (where A = acceptor, D = donor, with n going from 2 to infinite). The formation of extended structures has been extensively observed in the solid state, and the persistence of oligomeric structures of D/A adducts was detected in solution by PGSE determination.…”