Organic Semiconductors with High Conductivity. III. Perylene-Iodine Complex

Concerning the solid complex of perylene-iodine system, it has been clarified that two sorts of molecular addition compounds are formed. One has the composition of Perylene· 1.5 I2 (or 2 Perylene· 3 I2) and the other is Perylene· 3 I2. Both complexes are semiconductive with low resistivity; the resistivity at the room temperature is 9∼10 ohm.cm. and the energy gap is 0.06 eV. Concerning those values, both complexes possess almost the same values. Not only the elecrical properties and the magnetic properties, but also, both complexes possess similar crystal structures. To explain those facts, the structural units for those complexes have been proposed. These consist of the conjugation between perylene molecules and iodine molecules with the charge tranfer type of interaction.