Fig. 3

Polarized Raman spectra of 2,8-difluoro-5,11-bis(triethylsilylethynyl)anthradithiophene (diF-TES ADT). a Syn isomer and b anti isomer with the laser polarization aligned parallel to the C-C long axis (θ = 0°, dark blue) and short axis (θ = 90°, orange). c Polar plot showing the anticorrelation of the short axis (1421 cm⁻¹, orange) and long axis (1529 and 1597 cm⁻¹, hollow and solid light blue, respectively) modes for the anti isomer in b. The lines show fits to cos²(θ)