On the Electrical Conductivity of Violanthrone, Iso-Violanthrone, and Pyranthrone

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Abstract
Violanthrone, iso‐violanthrone, and pyranthrone have electrical conductance to a certain degree. This is due to the molecular structure of these compounds, which are made of the network planes of carbon atoms, and to the assumption that the π‐electron contribute to the electrical conduction. The electrical resistivity of violanthrone, iso‐violanthrone, and pyranthrone was measured. The values at 15°C are as follows; 2.3×1010 ohm‐cm, 5.7×109 ohm‐cm, and 3.9×1015 ohm‐cm respectively. The resistivity decreases with increasing temperature in every case, and a good linear relationships is observed between the logarithm of the resistivity and the reciprocal of the temperature. As the activation energy of the electrical conductance, the following values were observed; 0.39 ev, 0.375 ev, and 0.53 ev respectively. The values for violanthrone and iso‐violanthrone suggest that they can be assumed to be intrinsic semi‐conductors.

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