POLYMERIZATION OF PYRROLE AND PHENYLACETYLENE UNDER THE ACTION OF STABLE RADICAL IONS

Citation
Vg. Koshechko et al., POLYMERIZATION OF PYRROLE AND PHENYLACETYLENE UNDER THE ACTION OF STABLE RADICAL IONS, Synthetic metals, 59(2), 1993, pp. 273-278
Citations number
11
Categorie Soggetti
Physics, Condensed Matter","Metallurgy & Mining
Journal title
ISSN journal
03796779
Volume
59
Issue
2
Year of publication
1993
Pages
273 - 278
Database
ISI
SICI code
0379-6779(1993)59:2<273:POPAPU>2.0.ZU;2-9
Abstract
The possibility of pyrrole polymerization caused by chemically or elec trochemically generated radical cations of para-substituted triphenyla mines ((X-C6H4)3N.+A-, where X=-OCH3, A-=SbCl6- (I); X=-CH3, A-=SbCl6- (II); X=-Br, A-=SbCl6- (III); X = -OCH3, A- = BF, - (IV)) and phenyla cetylene polymerization in the presence of radical anions of anthracen e were explored. Reaction of radical cations, RC(I)-(IV), with pyrrole was shown to result in oxidative polymerization accompanied by simult aneous doping and conductive polymer formation. In the cases of RC(I), (II) and (IV), polypyrrole soluble in organic solvents, particularly in CH3CN, was obtained. The pyrrole polymerization rate under the acti on of radical cations and the properties of the resulting polymers wer e found to be largely dependent on radical cation structure. Increasin g radical cation oxidative ability in the trend I < II < III leads to accelerating RC-pyrrole reaction, the resulting polypyrrole conductivi ty rising, the number of paramagnetic centres changing and the soluble polymer yield declining. It was ascertained that RC(IV) and anthracen e radical anions are capable of acting as homogeneous catalysts, media tors of electron transfer in the electrochemical polymerization of pyr role and phenylacetylene, respectively. This allows the above processe s to run at lower potentials.