Raman characterization of parasexiphenyle n-doped with sodium and potassium: Solvent influence and modelization

Oligomers play a crucial role in the elucidation of the spectroscopic properties of parent infinite polymers. Thus, parasexiphenyl appears as a model compound of poly-paraphenylene (PPP). N-doping of parasexiphenyl with various organometallic compounds effectively leads to Raman and infrared properties analogous with those observed in n-doped PPP. Although the Raman spectra of the oligomer compound have been well documented in the literature for THF-wet samples, little work has been devoted to the Raman study of the dry corresponding samples. THF provides a huge dipolar effect and appears to greatly influence the vibrational properties of doped parasexiphenyl and PPP.