Journal ArticleDOI
Absence of Knight-Sheft in the Metallic State of Polyacetylene
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TLDR
In this paper, the magic angle spinning technique was used to record the NMR spectra of cis-(CH)x bi-solitons or bi-polarons and a line shift of about 30 ppm was found.Abstract:
NMR spectra on 18C of cis-(CH)x have been recorded using the magic angle spinning technique. Inspite of doping with AsF5 up to a level of ∼ 7at%, (CH)x does not convert to the trans modification. No Knight shift or other line shift is observed up to this dopant concentrtion. Above 7at% a line shift of about 30 ppm is found. To extend the soliton model to cis-(CH)x bi-solitons or bi-polarons are proposed.read more
Citations
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Book ChapterDOI
High-Resolution Solid-State NMR Studies of Synthetic and Biological Macromolecules
Hazime Saitô,Isao Ando +1 more
TL;DR: This chapter reviews the high-resolution solid-state nuclear magnetic resonance (NMR) studies of synthetic polymers and naturally occurring biological macromolecules with emphasis placed on revealing their conformations.
Journal ArticleDOI
Fully soluble self-doped poly(3,4-ethylenedioxythiophene) with an electrical conductivity greater than 1000 S cm−1
TL;DR: The results indicate that the molecular weight of S-PEDOT is the critical parameter for increasing the number of nanocrystals, corresponding to the S- PEDOT crystallites evaluated by x-ray diffraction and conductive atomic force microscopic analyses as having high electrical conductivity.
Journal ArticleDOI
Primary and secondary structures of synthetic polymer systems as studied by 13C N M R spectroscopy
TL;DR: In this article, developpements experimentaux de la RMN 13 C solide, en solution et bidimensionnelle, calculs theoriques des parametres de RMN (deplacement chimique, couplage spin-spin).
Journal ArticleDOI
DC and microwave conductivity of iodine-doped polyacetylene
TL;DR: In this paper, the microwave and DC conductivities of trans- and cis-polyacetylene, doped with iodine to sub-metallic levels, were measured in the temperature range 8 to 300K.
Journal ArticleDOI
Observation of relaxation modes in room temperature ferroelectric liquid crystal mixtures
TL;DR: In this paper, the dielectric measurements in the SmC* and SmA phases of a room temperature ferroelectric liquid crystal mixture FLC-6980 in the cells of different thickness in planer alignment were carried out in the frequency range 100 Hz to 1 MHz.
References
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Journal ArticleDOI
Solitons in polyacetylene
TL;DR: In this paper, the authors present a theoretical study of soliton formation in long-chain polyenes, including the energy of formation, length, mass, and activation energy for motion.
Journal ArticleDOI
Electrical Conductivity in Doped Polyacetylene.
C. K. Chiang,C. R. Fincher,Yung Woo Park,Alan J. Heeger,H. Shirakawa,E. J. Louis,S. C. Gau,Alan G. MacDiarmid +7 more
TL;DR: In this paper, a metal-to-insulator transition at dopant concentrations near 1% was shown for polyacetylene, a new class of conducting polymers in which the electrical conductivity can be systematically and continuously varied over a range of eleven orders of magnitude.
Journal ArticleDOI
Simultaneous polymerization and formation of polyacetylene film on the surface of concentrated soluble Ziegler-type catalyst solution
TL;DR: In this article, a direct method of simultaneously polymerizing and forming acetylene monomer to produce uniformly thin films of polyacetylene was investigated in terms of catalyst system, catalyst concentration, and polymerization temperature.
Journal ArticleDOI
Charged Π-phase kinks in lightly doped polyacetylene
Michael J. Rice,Michael J. Rice +1 more
TL;DR: In this paper, it was shown that extra electrons or holes added to polyacetylene via light doping will be accomodated in polyethylene in the form of charged π-phase kinks, rather than filling available electron band states.