New Coplanar (ABA)n-Type Donor-Acceptor -Conjugated Copolymers Constituted of Alkylthiophene (Unit A) and
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- 作者：Takuma Yasuda ; Yoshimasa Sakai ; Shinji Aramaki ; and Takakazu Yamamoto
- 刊名：Chemistry of Materials
- 出版年：2005
- 出版时间：November 29, 2005
- 年：2005
- 卷：17
- 期：24
- 页码：6060 - 6068
- 全文大小：302K
- 年卷期：v.17,no.24(November 29, 2005)
- ISSN：1520-5002
文摘
A new series of 
-conjugated (ABA)n-type polymers constructed of electron-donating thiophene or3-alkylthiophene (as the unit A) and electron-accepting pyridazine (as the unit B) were synthesized viapalladium-catalyzed dehalogenative polycondensation of Br-ABA-Br using hexamethylditin as thecondensing reagent. The obtained polymers were characterized by NMR, IR, and elemental analysis.The polymers with alkyl side chains were soluble in organic solvents, and gave number-average molecularweights ranging from 3.2 × 104 to 16 × 104 in gel-permeation analysis. The polymers exhibited stronggreen photoluminescence (PL) with the peak in the range of 510-520 nm and quantum yields of 51-61% in chloroform. The PL intensity was sensitive toward acids. In films, the UV-vis and PL peaksshifted to a longer wavelength by about 30-40 nm. Powder X-ray diffraction data suggested that thepolymer formed a highly ordered -stacked assembly assisted by the side chain crystallization and dipole-dipole interaction. Cyclic voltammetry revealed that the polymer was susceptible to both electrochemicalp- and n-doping, and the n-doping peak appeared in the range of -2.15 to -2.28 V vs Ag+/Ag. Thepolymer served as a good material for a thin-film field-effect transistor and gave a hole mobility of 3 ×10-3 cm2 V-1 s-1.
-conjugated (ABA)n-type polymers constructed of electron-donating thiophene or3-alkylthiophene (as the unit A) and electron-accepting pyridazine (as the unit B) were synthesized viapalladium-catalyzed dehalogenative polycondensation of Br-ABA-Br using hexamethylditin as thecondensing reagent. The obtained polymers were characterized by NMR, IR, and elemental analysis.The polymers with alkyl side chains were soluble in organic solvents, and gave number-average molecularweights ranging from 3.2 × 104 to 16 × 104 in gel-permeation analysis. The polymers exhibited stronggreen photoluminescence (PL) with the peak in the range of 510-520 nm and quantum yields of 51-61% in chloroform. The PL intensity was sensitive toward acids. In films, the UV-vis and PL peaksshifted to a longer wavelength by about 30-40 nm. Powder X-ray diffraction data suggested that thepolymer formed a highly ordered -stacked assembly assisted by the side chain crystallization and dipole-dipole interaction. Cyclic voltammetry revealed that the polymer was susceptible to both electrochemicalp- and n-doping, and the n-doping peak appeared in the range of -2.15 to -2.28 V vs Ag+/Ag. Thepolymer served as a good material for a thin-film field-effect transistor and gave a hole mobility of 3 ×10-3 cm2 V-1 s-1.