Raman spectroscopic studies of regioregular poly(3-alkylthiophenes)

被引:246
作者
Louarn, G
Trznadel, M
Buisson, JP
Laska, J
Pron, A
Lapkowski, M
Lefrant, S
机构
[1] ACAD MIN & MET,DEPT MAT SCI & CERAM,PL-30059 KRAKOW,POLAND
[2] TECH UNIV WARSAW,DEPT CHEM,PL-00664 WARSAW,POLAND
[3] SILESIAN TECH UNIV,DEPT CHEM,PL-44100 GLIWICE,POLAND
[4] TECH UNIV LODZ,DEPT TEXT ENGN & ENVIRONM SCI,PL-43300 BIELSKO BIALA,POLAND
关键词
D O I
10.1021/jp960104p
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Raman spectra of neutral and electrochemically doped regioregular poly(3-decylthiophene) were studied using different excitation lines, namely, 457.9, 514.5, 676, and 1064 nm. Contrary to the case of nonregioregular poly(3-decylthiophene) obtained by polymerization with FeCl3, in regioregular polymer the position of the principal band (due to the C-alpha=C-beta stretchings) is essentially independent of the excitation wavelength, proving its high structural homogeneity and extended conjugation. Raman spectroelectrochemical studies of oxidative doping of regioregular poly(3-decylthiophene) can be clearly correlated with cyclic voltammetry and UV-visible-near-IR spectroelectrochemistry provided that appropriate excitation wavelengths are selected. In particular, the use of the red (676.4 nm) and near-IR (1064 nm) excitation lines enables us to register the doping induced changes in the Raman spectra, whereas the green (514.5 nm) line always reveals the vibrations from the undoped segments of the polymer chain independently of the doping level. Finally, vibrational calculations, based on the symmetrized dynamical matrix, performed for undoped and doped poly(3-decylthiophene) led to a good agreement between the calculated and experimentally observed frequencies.
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页码:12532 / 12539
页数:8
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