Pregled bibliografske jedinice broj: 7421
Raman Spectra of Protonated and Deuterated Azobenzene
Raman Spectra of Protonated and Deuterated Azobenzene // Book of Abstracts / Mink, J ; Jalsovsky, G ; Keresztury, G. (ur.).
Budimpešta: Hungarian Academy of Sciences (MTA), 1996. str. 250-250 (poster, međunarodna recenzija, sažetak, znanstveni)
CROSBI ID: 7421 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Raman Spectra of Protonated and Deuterated Azobenzene
Autori
Smrečki, Vilko ; Baranović, Goran ; Meić, Zlatko ; Keresztury, Gabor
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Book of Abstracts
/ Mink, J ; Jalsovsky, G ; Keresztury, G. - Budimpešta : Hungarian Academy of Sciences (MTA), 1996, 250-250
Skup
XXIII. European Congress on Molecular Spectroscopy
Mjesto i datum
Balatonfüred, Mađarska, 25.08.1996. - 30.08.1996
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Sažetak
Azo compounds have a wide application in different fields such as: chemistry of dyes, acid-base indicators, polymers, biomolecules and so on. Protonation of the azo group is particularly interesting since it occurs very often during chemical reactions. We have chosen trans-azobenzene (tAB) as a model compound because of the equivalence of the two nitrogens and the absence of possible perturbations due to a substituent.
The difficulty to obtain good Raman spectra of protonated and deuterated trans-azobenzene using visible lasers has been overcome by the use of the near-infrared Nd-YAG laser excitation with a FT-Raman spectrometer. We recorded Raman spectra of (D_0)-, (D_10)- and (N-15)-trans-azobenzene isotopomers as powders and solutions in CF_3COOH and CF_3COOD. An effort was also made to measure Raman spectra of protonated trans-azobenzenes in different acids (HCl, HClO_4, H_2SO_4, CF_3COOH) using ethanol as a solvent. There was no appreciable effect from the counter ion on any signal in the recorded spectra.
The normal coordinate calculations have shown a substantial contribution of the phenyl group mode 19b to the N=N stretching (1439 cm(-1) in (D_0)-tAB) mode in the neutral species. This interaction is further complicated with the new coupling between N=N stretching (1401 cm(-1) in (D_0)-tAB) and N-H bending (1547 cm(-1) in (D_0)-tAB) modes in the protonated species. The assignation of the most significant vibrational modes of protonated and deuterated trans-azobenzene isotopomers, as well as a comparison with the protonated and deuterated isoelectronic trans-N-benzylideneaniline, will be presented.
Izvorni jezik
Engleski
Znanstvena područja
Kemija
