CH-Bindungsmomente aromatischer Kohlenwasserstoffe

Abstract

The absorption intensities of the CH stretching vibrations of the planar hydrocarbons naphthalene anthracene 9 10 d2 anthracene pyrene and fluoranthene have been measured in CCl4 solution Though the π electron densities in the different positions differ from the uniform π electron density in benzene the CH bond intensities in these aromatic hydrocarbons are the same as the CH bond intensities in benzene From this the conclusion can be drawn that no strong interaction between the π electron system and the aCH bonds exists and therefore changes in the π electron density have no measurable effect on the IR intensities of the CH stretching vibrations