SPECTROSCOPIC PROPERTIES OF POLYACETYLENES SYNTHESIZED VIA 3 MODIFICATIONS OF ZIEGLER-NATTA CATALYTIC-SYSTEM

Results of spectroscopic measurements of three types of highly conduct ing polyacetylene are presented. A comparison is made of the tradition al Shirakawa (or S-(CH)(x)), Naarmann (or N-(CH)(x)) and Tsukamoto (or nu-(CH)(x)) polyacetylenes. The non-conducting undoped materials have been characterized by C-13 CPMAS NMR, FT-IR and resonance Raman scatt ering. A higher conductivity for iodine-doped N-(CH)(x) and nu-(CH)(x) in comparison with S-(CH)(x) is observed even though a greater sp(3) content is found in N-(CH)(x) and nu-(CH)(x) films. Since the sp(3) hy bridized carbons may belong to catalyst residues, the sp(3) content do es not correlate with conductivity. On the other hand, it is shown fro m the resonance Raman scattering data that a longer average conjugatio n length in N-(CH)(x) and nu-(CH)(x) may correlate with the higher con ductivities of the iodine-doped films.