TY - JOUR
T1 - Studies on Conjugated Polymers
T2 - Preparation, Spectroscopic, and Charge-Transport Properties of a New Soluble Polythiophene Derivative: Poly(3′,4′dibutyl-2,2′:5′2″-terthiophene)
AU - Wang, Chenggang
AU - Benz, Michael E.
AU - LeGoff, Eugene
AU - Schindler, Jon L.
AU - Allbritton-Thomas, Joyce
AU - Kannewurf, Carl R.
AU - Kanatzidis, Mercouri
PY - 1994/4/1
Y1 - 1994/4/1
N2 - 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.
AB - 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.
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U2 - 10.1021/cm00040a012
DO - 10.1021/cm00040a012
M3 - Article
AN - SCOPUS:0000381759
VL - 6
SP - 401
EP - 411
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 4
ER -