Abstract

The results of an electron spin resonance (ESR) study of trans-polyacetylene, before and after doping with AsF5, are reported. The undoped polymer exhibits a Lorentzian line (g=2.00263) indicative of motional narrowing from a mobile unpaired electron species. Measurement of the intensity indicates a Curie law susceptibility with approximately one unpaired electron per 3×103 carbon atoms in agreement with earlier studies. From these results and comparison with earlier data on the cis polymer, it is suggested that the ESR signal arises from a mobile defect in the π system. Utilizing an apparatus which allows in situ AsF5 doping of a polyacetylene sample in the microwave cavity, we have monitored the ESR signal during the doping process. The spin resonance line narrows and increases in intensity, with no detectable g shift, as the doping proceeds. At high doping levels the line becomes asymmetric with a characteristic Dysonian line shape consistent with metallic behavior.

Keywords

PolyacetyleneElectron paramagnetic resonanceUnpaired electronDopingSpin (aerodynamics)Condensed matter physicsMaterials scienceResonance (particle physics)Nuclear magnetic resonanceElectronChemistryAnalytical Chemistry (journal)Atomic physicsPhysicsOrganic chemistry

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Publication Info

Year
1979
Type
article
Volume
70
Issue
3
Pages
1132-1136
Citations
337
Access
Closed

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Ira B. Goldberg, Harry R. Crowe, P. R. Newman et al. (1979). Electron spin resonance of polyacetylene and AsF5-doped polyacetylene. The Journal of Chemical Physics , 70 (3) , 1132-1136. https://doi.org/10.1063/1.437613

Identifiers

DOI
10.1063/1.437613