Table shows the fluorescence rate and the total ISC rate calculated from the sum of the individual ISC rates showed in Table . Independent of the solvation treatment, all those ISC rates involve transitions between -* states, therefore SOC values are very small. The ISC rate strongly depends on the energy gap between the states involved in the transition (see eq. ( )). Considering the results from explicit solvent systems, for the trans and cis resveratrol, the adiabatic (minimum-to-minimum) S1→T1 energy gaps are 1.27 eV and 1.42 eV, respectively. In the case of THP the adiabatic energy gap for S1→T2 and S1→T3 transitions is 0.52 eV and only 0.06 eV for the S1→T4 transition. These low adiabatic energy gaps contribute to higher ISC rate of THP (1.31×10 7 s -1 ) compared to those of the trans (2.15×10 -1 s -1 ) and cis-resveratrol (3.90×10 6 s -1 ).