Effect of Excitation Wavelength in Single-Molecule Photochemistry of Terrylene.

ABSTRACT: The reaction of terrylene in p-terphenyl with molecular oxygen is reinvestigated by TIRF-microscopy with λ_exc=488 nm or λ_exc=561 nm and 488 nm. A similar range of fluorescent products is obtained under both experimental conditions with a reaction quantum yield Φ_r>10^-7 for those molecules which undergo the photoreaction. The majority of these oxygen-susceptible molecules reacts via an electronically relaxed, dark intermediate, presumably an endoperoxide, with a lifetime of off>~20 s. From this time constant, an activation energy E_A<0.8 eV is estimated for the transition from the intermediate to the final product, the diepoxide, which nicely agrees with values calculated for the terrylene-derivative TDI. However, ~20 % of al

SUBMITTER: Mhanna R 

PROVIDER: S-EPMC11963977 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature