Naslov
FTIR spectroscopic study of the solvation of N, N-dimethylformamide in various organic solvents

Autori
Biliškov, Nikola ; Baranović, Goran

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

Izvornik
XIX. skup hrvatskih kemičara i kemijskih inžinjera : knjiga sažetaka / Škare, Danko - , 2005

Skup
Skup hrvatskih kemičara i kemijskih inžinjera (19 ; 2005)

Mjesto i datum
Opatija, Hrvatska, 24.04.2005. - 27.04.2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Ključne riječi
solvation; dimethyformamide; infrared

Sažetak
Amides are a subject of permanent interest in view of their importance as models of the peptide bond. In that respect, one of the most interesting points to resolve were the interactions of amides with various solvents, as well as the formation and structural and thermodynamical properties of amide aggregation in solutions. A huge amount of work in this field arose in last 50 years, so we can say that the amides were more than detailly known. In this work, infrared spectroscopical study of DMF behaviour in various organic solvents, from acidic to basic, relative to DMF, is reported. Linear free energy relationship with solvent acid-base properties of the solvent induced frequency shifts (SIFS) of the most characteristic infrared tertiar amide bands, i.e. C=O, (CMe-H)as, (C-H)formyl, Cformyl-N, and N-CMe stretching bands, on solvent and concentration was observed and discussed. Observed spectral features indicate formation of DMF---solvent, as well as DMF---DMF aggregates. Better knowledge about structural details of DMF---solvent complexes would help us to understand DMF complexation with larger and more important molecules. Structure of these complexes is discussed. It is found that structure of liquid DMF, as well as the structure of aggregates it forms with solvent molecules is largely determined by the ability of its methyl groups to take part in hydrogen bonding. Data were analysed to obtain estimates of the equilibrium constants for the dimerisation of DMF molecules.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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