Chemistry Reference
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Fig. 24 Structures of laterally extended perylene bisimides [
79
-
81
]
Fig. 25 Structures of anthenes
quateranthene (98) accordingly (Fig.
25
). Due to the extension of conjugation and
the presence of more zigzag edges, this class of compound shows further decreased
HOMO-LUMO gaps and lower stability compared to rylenes. Notably, anthenes
from teranthene on will exhibit large singlet biradical character in the ground state,
stemming from narrowed HOMO-LUMO gap and recovery of more sextet benze-
noid rings. In the course of seeking experimental investigation of the crossover
