Effect of substitution on the electronic spectra of benzaldehyde

Abstract

The effects of substitution of a ring hydrogen atom of benzaldehyde by a fluorine or chlorine atom have been explored by studying the (n, π*) triplet-singlet and singlet-singlet electronic transitions in the three isomeric fluoro- and chlorobenzaldehydes. The changes due to electronic excitation in a number of vibrational frequencies have been used to determine qualitative changes in the molecular geometry of these molecules in going from ground to excited states. © 1979.