Ultraviolet absorption spectra of seven substituted benzenes

Abstract

The ultraviolet absorption spectra of seven substituted benzenes have been measured in the region of 220 to 300 millimicrons. The substances were n-, iso-, sec-, and lert-butylbenzene and 1,2-, 1,3-, and 1,4-diethylbenzene. The wavelengths (also frequencies in centimeters-I) are shown for· the absorption bands for each substance. Spectral absorbancy curves are given for the ame concentration in each case. The hydrocarbons were NBS Standard Sample prepared in connection with American Petroleum Research Project 6 and were highly purified in t he Chemistry Division of thi Bureau. These spectral data should be of value in chemical analysis in the field of ultraviolet absorption spectroscopy.The m easurements were made with a Beckman q uartz spectrophotometer on I-centimeter cells of t he h ydrocarbons in a solution of isooctane (2,2,4-trimethylpentane).