Accession Number:

ADA199960

Title:

Soluble Ethylmercapto Substituted Polythiophenes

Descriptive Note:

Technical rept.

Corporate Author:

TEXAS UNIV AT ARLINGTON DEPT OF CHEMISTRY AND BIOCHEMISTRY

Report Date:

1988-09-27

Pagination or Media Count:

41.0

Abstract:

Polymers of 3-ethylmercapto and 3,4-bisethylmercaptothiophenes have been synthesized and characterized. These polymers are soluble in common organic solvents such as methylene chloride, chloroform and THF. Structural characterization using FT-IR and NMR spectroscopy show that these polymers have a well-defined beta-ethylmercapto substituted 2,5-thienylene polymeric structure. Visible-near IR absorption spectra of electrochemically doped cast films and chemically doped solutions of the polymers show that they can be oxidized to form bipolaronic species. GPC studies show a number average molecular weight of about 2500 M wM n approx. 5 for both polymers. Maximum electrical conductivities of 10-3ohmcm for the 3-ethylmercapto, and 10 to the -7th for the 3,4-bisethylmercaptosubstituted polymers have been obtained in the oxidized state. Experimental results are correlated with theoretical calculations using the PRDDO and extended Huckel methods, which demonstrate radical-cation reactivities for the thiophene monomers, along with minimum energy conformations and band structures in these substituted polymers. Keywords Conductive polymers Substituted polythiophenes Theoretical calculations Thiophenes.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE