Abstract
The observed electronic transitions and transition assignments of three pentacyclic aromatic hydrocarbons, benz(a)naphthacene, dibenz(a,c) anthracene, and 3,4-benzopyrene, are presented. The transitions of the pentacyclic aromatics are correlated with the transitions of tetracyclic aromatic hydrocarbons contained within the structure of the pentacyclic. The results of the experimental correlation are then compared with the results of a theoretical “molecules in molecule” interpretation of the pentacyclic transitions. The results of this comparison indicate that applying a theoretical composite system concept to the interpretation of pentacyclic spectra is justified for the lower energy transitions.
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