Polarization of electronic transitions in some alicyclic saturated ketones

Abstract

The direction of polarization of the symmetry-allowed short wavelength transition in alicyclic saturated ketones (λ max ≈ 180 nm) has been estimated. It was found, from measurements of linear dichroism of steroidal polycyclic ketones incorporated in stretched polyethylene films that this band is polarized along the CO bond axis. This direction is in accord with both π-π * and n-σ CC * assignments.