Studies of the π–π* Absorption Bands of p -Quinones and o -Benzoquinone

Abstract

The π–π* absorption spectra of p-benzoquinone, α-naphthoquinone, anthraquinone, and their derivatives, mainly in n-heptane up to the vacuum UV region, were obtained. On the other hand, MO calculations of the n-electronic systems of these p-quinones and o-benzoquinone were carried out by means of the P-P-P method. The π–π* absorption bands of these quinones could be favorably assigned on the basis of the calculated results.