Photoisomerization pathways and Raman activity of 1,1'-difluorostilbene
Abstract
The photoisomerization of 1,1'-difluorostilbene, following S0→S1 optical excitation in solution, was studied with femtosecond broadband transient absorption and stimulated Raman spectroscopy, and by quantum-chemical calculations. In n-hexane, trans-to-cis (t →c ) isomerization starts with Franck-Condon relaxation (τ1 t = 0.07 ps) followed by nearly barrierless torsion around the ethylenic bond (τ2 t ≈ 0.3 ps) to a perpendicular conformation P. About 50% of the excited molecules are trapped in P, while others reach the S1(cis) conformation adiabatically. For the opposite cis-to-trans (c →t ) path, the dynamics in n-hexane (τ1 c = 0.04 ps, τ2 c = 0.7 ps) suggest a 5 kJ/mol barrier between the relaxed S1(cis) and P states. The subsequent P decay with τ3 = 0.4 ps is followed by much slower ground-state recovery (τ4 ≈ 3 ps), indicating an intermediate state X. The t →P and c →P torsion depend on solvent viscosity and polarity, whereas the P →X →S0 relaxation and residual torsion is viscosity-independent but still polarity-dependent. Photoisomerization yields are derived from the transient absorption data and compared to those from actinometric measurements. Low-frequency oscillations in the transient signal are assigned to nuclei motions. Transient and stationary stimulated Raman spectra are compared to calculations. Early Franck-Condon Raman spectra differ from those of the quasistationary trans or cis S1 state. The photoisomerization behavior of stilbene and vinyl-substituted derivatives is compared and the general features are discussed.
- Publication:
-
Journal of Chemical Physics
- Pub Date:
- January 2017
- DOI:
- 10.1063/1.4974357
- Bibcode:
- 2017JChPh.146d4501D