Comprehensive Spectroscopic Investigation of Polynuclear Aromatic Hydrocarbons. I. Absorption Spectra and State Assignments for the Tetracyclic Hydrocarbons and their Alkyl-Substituted Derivatives

Abstract

The absorption spectra have been investigated and state assignments made for benz (a) anthracene, benzo (c) phenanthrene, chrysene, triphenylene, naphthacene, and pyrene. In addition, these results are compared with existing theoretical and experimental studies. The identification of electronic transitions have been made for all monomethyl drivatives of the above hydrocarbons except for naphthacene. The study extends over the spectral region 16 500–52 500 cm^—1. In addition, vibrational analyses are proposed for all cases considered. Certain dimethyl‐, alkyl‐ and fluorosubstituted derivatives have been studied. General spectral characteristics are included.