13C NMR and ESR Studies on a Polydiacetylene Having Acetylenic Carbons in the Side Chains

The 13C NMR spin-lattice relaxation times and ESR spectra were measured for a polydiacetylene obtained by the solid-state polymerization of a tetrayne with n-C14H29 alkyl substituents (14-4A-14). Poly(14-4A-14) has two different side chains. One side chain contains two conjugated acetylenic bonds di...

Full description

Saved in:
Bibliographic Details
Published inBulletin of the Chemical Society of Japan Vol. 67; no. 2; pp. 342 - 345
Main Authors Hayamizu, Kikuko, Okada, Shuji, Tsuzuki, Seiji, Matsuda, Hiro, Masaki, Atsushi, Nakanishi, Hachiro
Format Journal Article
LanguageEnglish
Published Tokyo The Chemical Society of Japan 01.02.1994
Chemical Society of Japan
Subjects
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
Side chain
Acetylenic compound
Morphology
EPR spectrometry
NMR spectrometry
Diacetylene polymer
Solid polymerization
Online AccessGet full text

Cover

More Information
Summary:The 13C NMR spin-lattice relaxation times and ESR spectra were measured for a polydiacetylene obtained by the solid-state polymerization of a tetrayne with n-C14H29 alkyl substituents (14-4A-14). Poly(14-4A-14) has two different side chains. One side chain contains two conjugated acetylenic bonds directly bound to the main backbone conjugated system; the other is an alkyl chain. Although the unpaired electron density of poly(14-4A-14) measured by ESR is less than that in trans-polyacetylene, paramagnetic effects may contribute to the long 13C relaxation times of unsaturated carbons, which provides insight concerning the π-electron structure on the conjugated system.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.67.342