OPTICAL SPECTROSCOPIC INVESTIGATION OF SEGMENTED TRANS-POLYACETYLENE

The optical properties of segmented trans-(CH)x and trans-(CD)x are presented. It is shown from the resonance-Raman-scattering data that a clustering of sp3 defects occurs upon the introduction of deuterium atoms in trans-(CH)x and hydrogen atoms in trans-(CD)x. In view of this effect, the segmented polyacetylene sample still contains long conjugated segments whose electronic properties can account for the almost unchanged optical-band-gap values. The doping-induced infrared bands in different segmented samples are interpreted by considering the perturbation of the dopant on the lattice dynamics of long segments. Also, the dc-conductivity results are discussed in terms of the presence of clusters of sp3 defects, which can limit both interchain and intrachain transport processes.