Chemical Evidence for Remnantcis Bonds in ‘trans’-Polyacetylene

Autor:	Samuel Kaplan, William M. Prest, Arthur J. Epstein, Ronald J. Weagley, Harry W. Gibson, Ralph A. Mosher
Rok vydání:	1986
Předmět:	Chemistry General Engineering Cis effect Maleic anhydride Photochemistry symbols.namesake Polyacetylene chemistry.chemical_compound symbols Single bond General Materials Science Absorption (chemistry) Raman spectroscopy Isomerization Cis–trans isomerism
Zdroj:	British Polymer Journal. 18:115-119
ISSN:	1934-256X 0007-1641
DOI:	10.1002/pi.4980180211
Popis:	Residual 740 cm−1 absorption, a signature of the cis isomer, is always observed to the extent of ± 5% in ‘trans’-polyacetylene prepared thermally from the Shirawaka cis isomer, regardless of the temperature or duration of treatment. The view that a significant fraction of the ‘remnant cis bonds’ is in the form of or can be converted to cisoid single bonds is supported by the results of a Diels-Alder trapping experiment with maleic anhydride. The presence of the remnant cis linkages leads to simple rationalisation of free radical (soliton) generation and diffusion, conjugation lengths determined by Raman spectroscopy, x-ray structural evolution and electrical conductivity.
Databáze:	OpenAIRE
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