Delocalization length, electronic properties and vibrational spectra of neutral α, α′-dimethyl end-capped oligothiophenes

V Hernandez, J Casado, FJ Ramirez, G Zotti, S Hotta… - Synthetic metals, 1996 - Elsevier
We present FT-Raman and FT-IR spectra of neutral α, α′-dimethyl end-capped
oligothiophenes (to six thiophene units) as solid samples and in solution. Gas-phase …

Vibrational spectra and ab initio dft calculations of 3, 3′-and 4, 4′-dimethyl substituted 2, 2′-bithiophene.

V Hernández, J Casado, L Favaretto, G Distefano… - Synthetic metals, 1999 - Elsevier
We present FT-Raman and FT-IR spectra of two β-methyl substituted thiophene dimers.
Methylation at β-positions modulates the equilibrium molecular conformation, thus affecting …

Analysis of the intramolecular charge transfer in donor–acceptor α,α-substituted oligothiophenes from their vibrational spectra

V Hernandez, J Casado, F Effenberger… - The Journal of …, 2000 - pubs.aip.org
In this paper we report on the vibrational Fourier transform infrared (FT–IR) and Fourier
transform Raman (FT–Raman) spectra of a few donor–acceptor–substituted bi-ter-, and …

Vibrational Spectroscopic Study of a Series of α, α '-Diethyl End-Capped Oligothiophenes with Different Chain Lengths in the Neutral State

J Casado, S Hotta, V Hernandez… - The Journal of …, 1999 - ACS Publications
In this paper, we investigate the vibrational FT-IR and FT-Raman spectra of a series of α, α '-
diethyl substituted oligothiophenes with variable chain lengths (from trimer to hexamer) in …

End-capped oligothiophenes: a solid state vibrational spectroscopic study

C Ehrendorfer, H Neugebauer, P Bäuerle, A Neckel - Synthetic Metals, 1995 - Elsevier
We present solid state FT Raman spectra of neutral end-capped oligothiophenes ECnT
(oligothiophenes with cycloalkane 'caps' at the terminal thiophene units) with up to 7 …

Efficient π electrons delocalization in α, α′‐dimethyl end‐capped oligothiophenes: A vibrational spectroscopic study

V Hernandez, J Casado, FJ Ramirez, G Zotti… - The Journal of …, 1996 - pubs.aip.org
α, α′‐dimethyl substituted oligothiophenes with increasing chain length (from the dimer up
to the hexamer) were recently synthesized by chemical methods. In this paper we have …

A theoretical investigation of α, α′-dimethyl end-capped oligothiophenes: structures, vibrational spectra and conjugation defects

J Casado, V Hernandez, FJ Ramirez, JTL Navarrete - Synthetic metals, 1997 - Elsevier
Ab initio quantum-chemical methods are used in the study of the effect of ionization on the
geometries and vibrational spectra of a series of α, α′-dimethyl end-capped …

The deformability of the thiophene ring: A key to the understanding of the conformational properties of oligo‐and polythiophenes

G Barbarella, M Zambianchi, A Bongini… - Advanced …, 1993 - Wiley Online Library
The deformability of the thiophene ring: A key to the understanding of the conformational
properties of oligoâ•’ and polyth Page 1 Communications coherence may have to be taken into …

Temperature-dependent infrared spectroscopic and crystallographic study of -dimethyl oligothiophenes in neutral form

FJ Ramı́rez, MAG Aranda, V Hernández… - The Journal of …, 1998 - pubs.aip.org
We have studied structural and spectroscopic characteristics on a series of α, α′-dimethyl
end-capped oligothiophenes (from two to six thiophene units) by varying temperature …

Ab initio HF and DFT calculations of geometric structures and vibrational spectra of electrically conducting doped oligothiophenes

J Casado, V Hernández, FJ Ramırez… - Journal of Molecular …, 1999 - Elsevier
This article reports results of a theoretical study of the effect of ionization on the infrared
spectra of a series of α, α′–dimethyl end-capped oligothiophenes with the purpose of …