Low-frequency (10–150 cmˉ¹) Raman spectra of the low-temperature (LT) and high-temperature (HT) polymorphs of the organic semiconductor α-quaterthiophene at 300 and 10 K are reported. Polarized spectra, assisted by quasi-harmonic lattice dynamics (QHLD) calculations, allow characterization of the lattice phonon dynamics and identification of the two phases spectroscopically. The experimental data can be explained by taking into account the coupling between intermolecular (lattice) and low-frequency intramolecular modes. Finally, Raman mapping is used to investigate the phase purity.
Ranzieri, P., Girlando, A., Tavazzi, S., Campione, M., Raimondo, L., Bilotti, I., et al. (2009). Polymorphism and phonon dynamics of α-quaterthiophene. CHEMPHYSCHEM, 10, 657-663 [10.1002/cphc.200800771].
Polymorphism and phonon dynamics of α-quaterthiophene
TAVAZZI, SILVIA;CAMPIONE, MARCELLO;RAIMONDO, LUISA;
2009
Abstract
Low-frequency (10–150 cmˉ¹) Raman spectra of the low-temperature (LT) and high-temperature (HT) polymorphs of the organic semiconductor α-quaterthiophene at 300 and 10 K are reported. Polarized spectra, assisted by quasi-harmonic lattice dynamics (QHLD) calculations, allow characterization of the lattice phonon dynamics and identification of the two phases spectroscopically. The experimental data can be explained by taking into account the coupling between intermolecular (lattice) and low-frequency intramolecular modes. Finally, Raman mapping is used to investigate the phase purity.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
