Fig. 8. (Top) fs-TRF spectra and (middle) fs-TA difference spectra of 1b–3b in CH2Cl2 (5 × 10–5 M) at 298 K (λ exc = 400 nm; 120 fs fwhm). Arrows indicate the spectral evolution. (Bottom) ns-TA difference spectra of 1b–3b in degassed CH2Cl2 (laser λ exc: 355 nm). Insets show the kinetic time profiles and the decay time constants at the specified wavelengths.
