Characterization of Dominant Hydrogen Bonded Complex Structures of Dielectric Polarization and Viscous Flow Processes in Glycerol–Formamide Binary Mixtures

Ionic conduction in binary mixtures of dipolar liquids

“…The molecular interactions, dipolar ordering, and the structures of the amides molecules with different dipolar liquids over the entire composition range of the binary mixtures were extensively investigated by the ε s measurements [18][19][20][21][22][23][24][25][26]. Amides have a large liquid state range, high polarity and strong solvating power, due to which these are mostly used as solvents in the electrolyte preparations [1][2][3].…”

Studies on Hydrogen-Bond Interactions in Ternary Mixtures of Polar Solvents by Dielectric Constant Measurements

“…[30] c Literature values [31,32] These interactions reduce the effective number of parallel aligned dipoles per unit volume that contribute to the molecular dielectric polarization of these mixed solvents. The magnitude of the ε E values is evidence of the strength of unlike molecule H-bond interactions [25][26][27][28][29][30][31][32][33][34][35][36]. It is found that FA + DMF mixtures have larger values of ε E over the entire concentration range as compared to those of FA + AE mixtures, which suggest that DMF molecules form comparatively stronger H-bond interactions with FA and disturb more parallel aligned dipoles of FA structures.…”

“…Earlier [25][26][27][28][29][30][31][32][33][34][35][36], we have extensively investigated the dielectric properties of amides and amines mixed with different polar solvents over the entire concentration range to understand the H-bonding molecular interaction behavior between unlike molecules. In a continuation of our ongoing research on the dielectric constant of mixed solvents, in this manuscript, we have undertaken the dielectric-constant behavior of ternary mixtures consisting of equimolar formamide + N,N-dimethylformamide and formamide + 2-aminoethanol mixed with water, ethyl alcohol, dimethylsulphoxide, and 1,4-dioxane over the entire concentration range.…”

Characterization of Amide–Alkanediol Intermolecular Interactions

“…FOR is able to develop cyclic dimers and also chainlike aggregations by H-bonding; the population of cyclic dimmers varies from 3.0 to 12.0% in the different available studies, although a value close to 8% seems to be confirmed by some experimental measurements . The inclusion of alkyl chains in the −NH 2 group leads to remarkable changes in the hydrogen bonding ability of formamides, and thus, the two simplest derived molecules N -methylformamide (NMF) and N , N -dimethylformamide (DMF) have also been the subject of remarkable research. , The hydrogen bonded network in pure FOR is characterized by the formation of two H-bonds per molecule on average, , whereas the structure of DMF is characterized by intermolecular interactions through dipole–dipole mechanisms. , Likewise, considering the presence of both donor and acceptor hydrogen bonding groups in FOR and NMF, or only acceptor in DMF, the behavior of these molecules upon mixing with other relevant hydrogen bond donors and/or acceptors has also been studied ,− In particular, formamides + alcohols have been studied because of the relevance of having −OH, −NH 2 , and −COH functional groups in the same fluid with regard to the characterization of hydrogen bonding in complex fluids. − The complex structuring in formamide + alcohol binary liquid mixtures rising from the H-bonding and its changes with mixture composition should be even more complicated when considering alkanediols, in which the presence of two hydroxyl groups may lead to interactions with the available groups in the formamides developing H-bonded networks. To our knowledge, no previous studies were reported in the literature for formamides + 1,2-alkanediols, and thus, considering the relevant features of 1,2-alkanediols, − and the complexity of H-bonding in these liquid mixtures, the study of these systems deserves detailed attention.…”