Specific solvent effect on lumazine photophysics: A combined fluorescence and intrinsic reaction coordinate analysis

- Correlation of lumazine photophysics with multiparametric Kamlet-Taft equation.
- Solvent basicity (β) contributes maximum towards the hydrogen bonding (HB) effect.
- HB interaction occurs at N1 and N3 proton in S0 and S1 state, respectively.
- IRC calculation for different tautomerization processes both in S0 and S1 states.
- Process related to riboflavin biosynthesis is thermodynamically feasible.