Studies on Conjugated Polymers: Preparation, Spectroscopic, and Charge-Transport Properties of a New Soluble Polythiophene Derivative: Poly(3′,4′dibutyl-2,2′:5′2″-terthiophene)

Chenggang Wang, Michael E. Benz, Eugene LeGoff, Jon L. Schindler, Joyce Allbritton-Thomas, Carl R. Kannewurf, Mercouri G. Kanatzidis

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Abstract

A new polythiophene derivative has been synthesized by chemical oxidative polymerization of 3′,4′-dibutyl-2,2′:5′2″-terthiophene (DBTT). The new polymer, poly(DBTT), contains two soluble fractions of differing molecular weights both of which were characterized by X-ray diffraction, IR, NMR, UV-vis-NIR, photoluminescence, and ESR spectroscopies, as well as magnetic susceptibility and charge-transport measurements. The molecular weights of both fractions were determined by gel permeation chromatography. The high molecular weight fraction (Mw ~ 9.1 × 103) has one of the longest π-conjugation lengths known for poly(alkylthiophenes) and high conductivity. The low molecular weight fraction (Mw ~ 4.3× 103) has a shorter conjugation length and 2 orders of magnitude lower conductivity (~10−2 S/cm) at room temperature. Thermal gravimetric analysis studies show that the polymer is stable in nitrogen up to 380 °C. Variable-temperature charge-transport data (conductivity and thermopower) for both doped polymer fractions indicate p-type metallic behavior. These results are compared to previously characterized polythiophenes.

Original languageEnglish
Pages (from-to)401-411
Number of pages11
JournalChemistry of Materials
Volume6
Issue number4
DOIs
Publication statusPublished - Apr 1 1994

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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