In the process of collecting a library of spectra of aromatic compounds for investigation of synthetic liquid fuels, various correlations have been observed. (1) Phenylnaphthalene-type spectra have been noted in related compounds, (2) spectra and structures of fluorene derivatives have been studied; (3) graphs of intensity as a function of wavelength for the first band in the spectra of several alkyl- and alicyclic-benzenes and phenols have revealed interesting properties; (4) spectral effect of three classes of alicyclic rings on the first band in spectra of polynuclear condensed aromatics have been discussed, and (5) ring-strain, produced by substituents in an aromatic nucleus because of steric hindrance, has been found to cause drastic changes in the spectra.
R. A. Friedel, "Correlations in Ultraviolet Spectrophotometry," Appl. Spectrosc. 11, 13-24 (1957)