Some characteristic features of the electronic absorption spectra of 1,3,5-trimethoxy benzene in the solid phase and in rigid glass media at 77 K

The near ultraviolet absorption system of 1,3,5-trimethoxy benzene in the solid phase and in an isobutyl alcohol rigid glass at 77 K is characterised by the appearance of the 0,0 band and excitation of totally symmetric vibrations. In the spectrum of the solid, two out-of-plane vibrations are coupled with the electronic transition. The spectral features indicate that in the solid phase, the molecular symmetry is lower than D_3h and the molecule is probably not planar.