VIBRATIONAL STUDIES OF A SERIES OF ALPHA-OLIGOTHIOPHENES AS MODEL SYSTEMS OF POLYTHIOPHENE

被引：166

作者：

LOUARN, G ^{[1
]}

BUISSON, JP ^{[1
]}

LEFRANT, S ^{[1
]}

FICHOU, D ^{[1
]}

机构：

[1] LAB MAT MOLEC, CNRS, UPR 241, F-94320 THIAIS, FRANCE

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1995年 / 99卷 / 29期

关键词：

D O I：

10.1021/j100029a016

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：

Vibrational properties of a series of individual pi-conjugated alpha-coupled oligothiophenes alpha-nT have been investigated by resonance raman scattering (RRS) and infrared absorption spectroscopies. The experimental frequencies obtained on crystalline evaporated alpha-nT (n = 4, 6, and 8 thiophene rings) thin films are compared with those calculated using a symmetrized dynamical matrix model. Special attention is given to the 1300-1600 cm(-1) region where the C-alpha=C-beta and C-beta-C-beta stretching vibrations are active. Also, vibrational spectra of doped alpha-sexithiophene in the solid state are reported where we observe remarkable changes when using different excitation wavelengths. It appears that upon doping, the alpha-sexithiophene polymerizes and the consequent doped poly(sexithiophene) presents a distorted conformation around the inter-ring single bonds. In addition to a complete assignment of the various vibrational modes of each alpha-nT molecule, our results on well-defined model oligomers shed some light on the controversial parent polythiophene and poly(3-alkylthiophenes).

引用

页码：11399 / 11404

页数：6

共 31 条

[1] CORRELATION BETWEEN VIBRATIONAL-SPECTRA AND ELECTRICAL-CONDUCTIVITY OF POLYTHIOPHENE [J].