The absorption spectra of benzene derivatives in the vacuum ultra-violet. II

Abstract

The far ultra-violet spectra of styrene, α -methyl styrene, phenyl acetylene, phenyl cyanide and phenyl isocyanate are described. Many of the observed regions of absorption are cor­related with those of the benzene spectrum. The important fact emerges that, with increasing conjugation of the side chain with the ring, the benzene 1980 A absorption moves much farther to long wave-lengths than do the benzene 2600 and 1790 A absorptions. α -Methyl styrene shows a shift to the violet of certain regions of its spectrum relative to styrene. Phenyl isocyanate has a spectrum much closer to that of benzene than have the other molecules discussed.