Naslov
Infrared Spectroscopy of Liquid Water-N, N-dimethylformamide Mixtures

Autori
Biliškov, Nikola ; Baranović, Goran

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
EUCMOS 2008. - Book of Abstracts / Musić, Svetozar ; Ristić, Mira ; Krehula, Stjepko - Zagreb, 2008, 19-19

ISBN
978-953-6690-76-3

Skup
European Congress on Molecular Spectroscopy

Mjesto i datum
Opatija, Hrvatska, 31.08.2008. - 05.09.2008

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Amide; DMF; Water; FTIR; ATR; Optical Constants

Sažetak
The imaginary molar polarisability spectra of mixtures of water with N, N-dimethylformamide (DMF) over the entire composition range (0 < x < 1) at 25°C were obtained between 4000 and 700 cm^-1 by use of calibrated multiple reflection attenuated total reflection (ATR) technique. The composition dependent molar fractions of water bonded and DMF bonded OH groups, together with water bonded and free carbonyl groups, were determined from the integral intensities COH, CCO, CNCO, the areas under the nu(OH) and nu(C=O) bands, respectively, in the molar polarisability spectra. The obtained results are compared with thermodynamic properties of the system, and with results of molecular dynamics simulations. Behaviour of molar fraction of OH species indicates presence of stable aggregates of H2O molecules over the large composition interval, 0.2 < xDMF < 0.9. Aggregates of DMF, in which methyl groups are placed apart from surrounding water, are established in the interval xDMF < 0.2. For higher xDMF, DMF molecules orient in random orientation, giving rise to dipole-dipole pairs. Only in the interval xDMF > 0.9 water is dispersed into small clusters of water surrounded by DMF molecules.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA