Abstract
In order to confirm and to extend the scope of the equation 1, 3EUVho→lu=aF+bR+c, presented by us in the foregoing paper, the polarographic half-wave reduction (Ered1/2) and oxidation (Eoxd1/2) potentials in nonaqueous media and the electronic spectra of 4-substituted azobenzenes have been analyzed. Although the equation was originally derived for π-π* type HOMO→LUMO transitions with the same character in a series of substances, in this paper we have theoretically verified that the equation is also applicable to the n-π* bands of conjugated systems. The singlet n-π* and π-π* bands of 4-substituted azobenzenes and the triplet n-π* bands of 4, 4'-disubstituted benzophenones were employed to examine the above equation. The results were reasonable, and are discussed from the viewpoint of molecular orbital theory.
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