The ionization energies of the first few polyacenes are 9.4 eV for benzene, 8.3 eV for naphthalene,

Question:

The ionization energies of the first few polyacenes are 9.4 eV for benzene, 8.3 eV for naphthalene, 7.6 eV for anthracene, and 7.0 eV for tetracene. Use these data to calculate values of α and β in the HMO method. Compare the result with the β value in (17.49). Predict the ionization energy of pentacene. The HMO x values for the highest-occupied MOs of these polyacenes are -1.00, -0.618, -0.414, -0.295, and -0.220.