Densitometric and spectroscopic investigation of interactions of selected N-substituted amides and acetonitrile

Volumetric Properties of (Difurylmethane + an Amide) Binary Mixtures at 293.15K, 298.15K and 303.15 K

“…The negative values thus indicate that DFM and NMF/NEF molecules are more efficiently packed in the binary mixtures than in their pure states. Spectroscopic and dielectric studies confirm the strong self-association of secondary amides through N-H····O = C hydrogen bonds which has been reported to persist even in the infinite dilute amide solutions [8,9]. It is possible that addition of DFM to NMF or NEF may only partially disrupt the hydrogen-bonded aggregates in each of the secondary amides.…”

“…The liquid structure of the pure DFM is determined by the dipole-dipole interactions [2]. On the other hand, molecules of secondary amides are self-associated through hydrogen bonding due to the presence of a strong proton-acceptor group (C = O) and a proton-donor group (-NH) in their molecules and the dipole-dipole intermolecular interactions [6,8,9]. Thus the mixing of DFM with the secondary amides to form [DFM + (NMF or NEF)] binary systems would result in mutual disruption of the dipole-dipole associates in the DFM liquid structure and the hydrogen-bonded aggregates as well as the dipole-dipole interactions in pure NMF or NEF, which would contribute positively to values.…”

“…DFM is an aprotic dipolar substance whose liquid structure is determined by the dipole-dipole interactions [1][2][3] and has the potential for use in solvent extraction processes for separating polar organic substances from aqueous media. On the other hand secondary amides (NMF and NEF) are strongly self-associated through hydrogen bonding and dipole-dipole interactions (NMF, µ = 3.86D; NEF, µ = 3.80D at 298.15K) [5][6][7][8][9]. This association is reported to decrease with the size of alkyl group in the amide molecule [6,10].…”