IR Spectroscopic Studies on Anthracene Species Formed on SiO₂-Al₂O₃

Abstract

The yellow dark green anthracene species chemisorbed on SiO₂-Al₂O₃, activated at 550°C under 10^-4 Torr for 3hr, exhibited, in the range from 1, 600 to 1, 450cm^-1, several absorption bands which were very similar to the ring stretching bands of the anion radical or of the 9-anthracenium ion, but there were no bands arising from the aliphatic groups. These observations indicated that most of the species were for the first the σ-complex produced between the adsorbate and a Lewis acid center, and for the second the cation radical.