Fundamental vibrations of thiophene and its deuterated derivatives

Catalytic oxidation of thiophene and its derivatives via dual activation for ultra-deep desulfurization of fuels

“…5a shows the IR spectra in the range from 650 to 850 cm À1 of [Hnmp]BF 4 , thiophene and the mixture of them at molar ratio of 2. The IR results indicate that the structure of thiophene is distorted according to the appearance of a new peak at 735 cm À1 and the weakening one at 713 cm À1 which is assigned to @CAH bending vibrations of thiophene [26], when BAILs are mixed with thiophene. The relative intensity of the new peak appeared at 735 cm À1 for different BAILs containing thiophene is found to be in accord with the activity in ODS of thiophene (Table 1, Fig.…”

High Resolution IR-Spectra of Furane and Thiophene

“…Microwave data and low-resolution IR data of both molecules have been published [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Those earlier papers reported the rotational and centrifugal constants of the ground state, the molecular structure, and gave a vibrational analysis of band origins and the force field.…”

“…The high-resolution Fourier transform spectrometer at Giessen and the Cologne diode-laser spectrometer were utilized for this purpose. In the previous papers [1,2] the v 13 out-of-plane fundamental bands of both molecules are labeled as v 19 ; here we follow Mulliken's recommendation for notation [15]. The out-of-plane vibrations belong to A 2 and B x symmetry species of C 2v , and the modes are numbered according to descending order of frequency in each symmetry block.…”

“…An interactive Loomis-Wood program was applied to identify the c-type transitions of furane from 715 cm -1 to 767 cm" 1 . For thiophene we have assigned lines from 685 cm" 1 to 725 era" 1 .…”

“…For thiophene we have assigned lines from 685 cm" 1 to 725 era" 1 . We analyzed the observed transition frequencies by applying Watson's ^-reduced Hamiltonian.…”