Infrared and Raman spectra of two well-barrier-well 1,2-Di(α,α '-oligothienyl)ethanes

摘要

The vibrational Fourier transform infrared and Fourier transform Raman spectra of two neutral thiophene-based oligomers in solution and in the solid state were studied. The compounds have a well-barrier-well structure, where the well parts are two biothiophene or terthiophene end moieties and the barrier part is a dimethylene fragment with a larger energy gap. Characteristic features are correlated with bibrational data on one-dimensional unsubstituted α-oligothiophenes and α,α'-dimethyl end-capped oligothiophenes. Vibrational assignments are also proposed for relevant bands in the whole spectral range.