Low Temperature Raman Spectroscopy of Tetrahydrofuran: Phonon Spectra Compared to Matrix Isolation Spectra in Air

Mohaček-Grošev, Vlasta (2024) Low Temperature Raman Spectroscopy of Tetrahydrofuran: Phonon Spectra Compared to Matrix Isolation Spectra in Air. Crystals, 14 (5). ISSN 2073-4352

PDF - Published Version - article Available under License Creative Commons Attribution. Download (3MB)

Abstract

The conformation of tetrahydrofuran (THF) molecules in vapor has been the subject of considerable computational and experimental studies, the most recent by Park and Kwon stated that the difference between the most stable, twisted C2 conformer and the bent Cs conformer is 17 ± 15 cm−1. Because of low symmetry, all modes from both conformers are allowed in the Raman and infrared spectra. In 1982, Aleksanyan and Antipov observed the emergence of two Raman bands at 249 and 303 cm−1 at 20 K, while only one band at 293 cm−1 was present in solid THF at 142. They assigned the 249 cm−1 band to the restricted pseudorotational motion of THF in the solid state, because on heating, the band diminishes and is too weak to be observed near melting point (at 142 K). Cadioli et al. reported a study of the vibrational spectrum of tetrahydrofuran, giving a complete assignment of all bands including those present in the low-temperature Raman spectrum at 85 K and infrared bands observed at 90 K. They assigned the band at 242 cm−1 in the Raman spectrum at 85 K as an overtone of the lowest normal mode (pseudorotational mode), while the 299 cm−1 band in the same spectrum was assigned as a radial mode. In the following, low-temperature Raman spectra of solid THF together with the Raman matrix isolated spectrum of THF in air will be presented and compared to published data. Our results indicate that the band observed at 245 cm−1 at 10 K is too strong to be assigned as an overtone, since its intensity is of the same magnitude as the 299 cm−1 band.

Item Type:	Article
Uncontrolled Keywords:	tetrahydrofuran ; Raman ; matrix isolation ; crystal ; low temperature ; pseudorotation ; ring puckering
Subjects:	NATURAL SCIENCES > Physics NATURAL SCIENCES > Chemistry > Physical Chemistry
Divisions:	Division of Materials Physics
Depositing User:	Ana Zečević
Date Deposited:	22 Jul 2024 08:10
URI:	http://fulir.irb.hr/id/eprint/8954
DOI:	10.3390/cryst14050468

Actions (login required)

View Item