Further Alkylbenzene Spectra to 1750A

Abstract

The absolute absorption intensities of n‐butyl‐, secondary butyl‐, and tertiary butylbenzene and of 1,3,5‐trimethylbenzene (mesitylene) have been measured to about 1750A. Increased branching of the side chain shifts the 1900A and 2100A bands slightly to shorter wave‐lengths but increases the total oscillator strength from 1.04 for n‐butyl to 1.57 for tertiary butyl. The wave‐length shifts are in the same direction, the intensity changes in the opposite direction from those observed in the 2600A bands of these same compounds. The mesitylene spectrum is about 1000 cm⁻¹ to the red of the meta‐xylene spectrum and its oscillator strength is reduced to 0.89, almost as low as that of benzene itself.