Photoinduced symmetry breaking charge transfer (SBCT) is fascinating process because of its importance in biological system and artificial solar energy harvesting system. 9,9’-Bianthracene (BA) is representative model system of the phenomena as it has simple two anthracene moieties (Figure 1). BA undergo SBCT only in polar solvents. Because it has orthogonal torsional geometry in ground state, charge transfer is unexpected process. Thus, not only solvation but structural change is important in SBCT of BA. However, it is still controversial about whether and how structural motion affects overall process. Time-resolved fluorescence with high time resolution (~50 fs) can be a good strategy to obtain clear dynamics as it contains the information of excited state exclusively. Time-resolved fluorescence and its spectrum of BA in non-polar and polar solvents revealed that reaction time in acetonitrile which has fast solvation time may not be same with solvation time (~400 fs). This results can state the importance of structural change on the process.
 Vauthey, E. Chemphyschem 2012. 13, 2001-2011.
 Takaya, T. Hamaguchi, H., Kuroda, H., Iwata, K. Chem. Phys. Lett. 2004. 399, 210-214.