Novel liquid crystalline (LC) semiconductors were prepared from the copper complex of a fused porphyrin dimer as the electroactive core by attaching to its periphery dodecyl and semifluoroalkyl side chains site-specifically (P=P hetero) and semifluoroalkyl side chains alone (P=Phomo). The former and latter formed rectangular columnar and orthorhombic LC mesophases, respectively, where the stacking geometries of the π-conjugated core are quite different from one another. Although the π-electronic properties of the core units in P=Phetero and P=Phomo in solution are substantially identical to one another, transient photocurrent profiles of their LC states under time-of-flight conditions clearly showed that P=Phetero behaves as an n-type semiconductor, whereas P=P homo, in contrast, behaves as a p-type semiconductor.
ASJC Scopus subject areas
- Colloid and Surface Chemistry