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

Research output: Contribution to journalArticle

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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 (M̄w ∼ 9.1 × 103) has one of the longest π-conjugation lengths known for poly-(alkylthiophenes) and high conductivity. The low molecular weight fraction (M̄w∼ 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
Publication statusPublished - 1994

Fingerprint

Conjugated polymers
Transport properties
Charge transfer
Molecular weight
Derivatives
Polymers
Gravimetric analysis
Thermoelectric power
Gel permeation chromatography
Magnetic susceptibility
Paramagnetic resonance
Photoluminescence
Nitrogen
Polymerization
Nuclear magnetic resonance
Spectroscopy
X ray diffraction
Temperature
polythiophene
alpha-terthienyl

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

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

In: Chemistry of Materials, Vol. 6, No. 4, 1994, p. 401-411.

Research output: Contribution to journalArticle

Wang, Chenggang ; Benz, Michael E. ; LeGoff, Eugene ; Schindler, Jon L. ; Allbritton-Thomas, Joyce ; Kannewurf, Carl R. ; Kanatzidis, Mercouri G. / 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). In: Chemistry of Materials. 1994 ; Vol. 6, No. 4. pp. 401-411.
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