Solvent-Dependent Resonance Raman Excitation Profiles of 9,9'-Bianthryl

Dynamics subsequent to the electronic excitation of 9,9′-bianthryl produce a polaremissive excited state for which the symmetry of the bichromophore is broken by adynamic solvent stabilisation of one of the two, otherwise degenerate, charge transferconfigurations which contribute to the excited electronic state. The initial state createdupon excitation is examined here by analysis of ground state resonance Ramanexcitation profiles (REPs) and electronic absorption spectra in solvents of variouspolarities. The results suggest that the REPs are signalling electronic differences betweenthe initially excited state in the various solvents. We suggest that this is related to thebianthryl excited state being responsive to the disordered solvent environment.