Dynamics of Excited States of the Carotenoid Peridinin in Polar Solvents: Dependence on Excitation Wavelength, Viscosity, and Temperature.

摘要: The dynamics of the excited states carotenoid peridinin in polar solvents were studied using femtosecond transient absorption spectroscopy spectral range 500−1900 nm. A broadening spectrum is caused by a distribution conformers having different ground-state properties. In addition, dependence lifetime on excitation wavelength reveals that two forms coexist protic solvents, where “red”-absorbing form produced hydrogen bonding via carbonyl group. observed show S1 and intramolecular charge transfer (ICT) are strongly coupled, forming collective S1/ICT state whose determined degree ICT character. nonpolar solvent, pure character with ∼160 ps observed, whereas an increase leads to as short 10 methanol 13 ethylene glycol. ch...