CONFORMATIONAL DISORDER AND MEAN CONJUGATION OF NEUTRAL ALPHA,ALPHA'-DIMETHYL END-CAPPED OLIGOTHIOPHENES IN SOLUTION - A FT-RAMAN AND FT-INFRARED SPECTROSCOPIC STUDY

Vibrational Fourier transform infrared (FT-IR) and Fourier transform R aman (FT-Raman) spectra of a few alpha,alpha'-dimethyl end-capped olig othiophenes with increasing chain length (from the trimer up to the he xamer) in solution are collected. Relevant data are interpreted with t he help of the assignment of the LR and Raman related bands of the sol id samples. The aim of the work is to extract from the comparison of b oth series of spectra (solutions and solids) structural probes for con formational disorder and mean pi electron conjugation lengths in solut ion.