Effect of Molecular Structures and Solvents on the Excited State Dynamics of the S_2 State of Carotenoids Analyzed by the Femtosecond Up-Conversion Method

摘要

A polar solvent induced changes in the S_2 lifetimes, In the case of β-carotene, the solvent effect was negligible. On the other hand, the S_2 decay time of other analogues was accelerated in methanol: 149 +-7, 127 +_6, and 96 +-13 fs for ?-apo-8'- carotenol, ethyl-β-apo-8'-carotenoate, and β-apo-8'-carotenal (Figure 1), respectively. The 96 fs lifetime of β-apo-8'-caroternal was the shortest measured so far.