Polycyclic aromatic hydrocarbon energy values

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The history of our knowledge of the electrical conductivity of organic solids has been discussed by several authors who were involved in the work on the electrical conductivity of polycyclic aromatic hydrocarbons in the years after 1950 in a special volume of Molecular Crystals, liquid Crystals [6] edited by H. Inokuchi. At the beginning of this newer period of research, there were at least five milestones Stimulated by the measurements of Eley on phthalocyanine, Akamatu and Inokuchi in the year 1950 discovered a thermally-activated specific conductivity with an activation energy of E= 0.39 eV in violanthrone, and obtained similar values for related aromatic soUds [7]. The interpretation given at the time for this value in terms of the model of an intrinsic semiconductor with a band gap AEg = 2E is, to be sure, obsolete today (see below), but the results clearly showed that no conductivity exists at T = 0 and thus no intrinsic charge carriers are present in the crystal. 

A number of perylene derivatives undergo cyclo addition reaction. Hern-don has shown that the free energies of activation of the reaction of MA with aromatic hydrocarbon has a linear relationship with calculated resonance energy differences. This approach has significant prediction value (see Table 4.5). Recently, kinetic studies of the DA reaction of maleic anhydride with polycyclic aromatics have been reported. 

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