POLARIZED EXAFS AND NEAR-EDGE SPECTRA OF HALOGEN-DOPED POLYACETYLENEReport as inadecuate




POLARIZED EXAFS AND NEAR-EDGE SPECTRA OF HALOGEN-DOPED POLYACETYLENE - Download this document for free, or read online. Document in PDF available to download.



Abstract : Polarized EXAFS and near-edge spectra were measured for CHBryx and CHIyx on the Br K- and I L-edges over a wide range of dopant concentration. The analysis of EXAFS and near-edge spectra indicates that, in the lightly doped region 0.01< y < 0.2, polybromine ions highly oriented along the c-axis are formed while bromines also form covalent bonds with polyacetylene chain which increases in number on going to heavily doped region y > 0.2. Bromines are incorporated as isolated ions in the early stage of doping y < 0.01. In CHIyx, iodines form linear polyions which are chemically less reactive. The difference in the magnitude and dopant concentration dependence of electrical conductivity between bromine and iodine doping is ascribed to the degree of termination of conjugated chains by an addition reaction of halogens.





Author: H. Oyanagi M. Tokumoto T. Ishiguro H. Shirakawa H. Nemoto T. Matsushita H. Kuroda

Source: https://hal.archives-ouvertes.fr/



DOWNLOAD PDF




Related documents