期刊
JOURNAL OF RAMAN SPECTROSCOPY
卷 49, 期 3, 页码 569-580出版社
WILEY
DOI: 10.1002/jrs.5301
关键词
deutero derivatives; DFT; effective conjugation coordinate; P3HT; poly(3-hexylthiophene-2; 5-diyl)
类别
资金
- Ministerio de Economia, Industria y Competitividad (MINECO) [CTQ2015-66897-P]
The recently synthesized regio-regular poly(3-hexylthiophene-2,5-diyl) selectively deuterated on the main chain backbone and/or on the hexyl side chain have given the opportunity to record their infrared (IR) and Raman spectra, and to carry out a spectroscopic study supported by density functional theory calculations. The Effective Conjugation Coordinate associated with the collective C=C stretching mode, with Raman scattering and IR absorption near 1,450cm(-1), is used as a probe of the electronic structure and the molecular conformation of the chain backbone. With the help of the data collected from the deuterated species, the vibrational assignment for the structurally relevant 1,600-1,300cm(-1) region has been clarified. The excitation-dependent wavenumbers and intensities of the C=C stretching Raman modes are discussed. Raman spectra excited in-resonance or off-resonance show the existence of a multimodal distribution of effective conjugation lengths that are ascribed to a phase hairy-A with a practically flat backbone chain, a phase hairy-B where the conformation of the backbone is slightly distorted, and an amorphous phase. IR spectra provide additional information on the Effective Conjugation Coordinate.
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