Symmetric biaryls are suitable systems for studies of solvent-induced symmetry breaking processes. Transient absorption spectra of biperylenyl in cyclohexane (CH) and acetonitrile (ACN) are shown in the left and right panel respectively. Absorption (solid black line) and stimulated emission (dashed black line) spectra are also displayed. All spectra are highly solvent dependent. The blue shift of the local excited-state absorption band at 600 nm and its longer lifetime in ACN compared to CH measured by time-correlated single photon counting point towards a charge transfer character of this state in polar solvent. Further experiments will provide deeper insight in photophysical properties of this system.
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