Measurements and Molecular Interactions for N,N-Dimethylformamide with Ionic Liquid Mixed Solvents

Abstract

To understand the molecular interactions between N,N-dimethylformamide (DMF) with two families of ionic liquids (ILs), we have measured thermophysical properties such as densities (rho) and ultrasonic sound velocities (u) over the whole composition range at 25 degrees C under atmospheric pressure. The excess molar volume (V(E)) and the deviation in isentropic compressibilities (DeltaK(s)) were predicted using these properties as a function of the concentration of IL. These results are fitted to the Redlich-Kister polynomials. The materials investigated in the present study included two families of ILs such as ammonium salts and imidazolium salts. Diethylammonium acetate ([Et(2)NH][CH(3)COO], DEAA), triethylammonium actetate ([Et(3)NH][CH(3)COO], TEAA), triethylammonium dihydrogen phosphate ([Et(3)NH][H(2)PO(4)], TEAP), and triethylammonium sulfate ([Et(3)NH][HSO(4)], TEAS) are ammonium salts and 1-benzyl-3-methylimidazolium chloride ([Bmim][Cl]) belongs to the imidazolium family. The intermolecular interactions and structural effects were analyzed on the basis of the measured and the derived properties. A qualitative analysis of the results is discussed in terms of the ion-dipole, ion-pair interactions, and hydrogen bonding between ILs and DMF molecules and their structural factors.

Influence of protic ionic liquids on the structure and stability of succinylated Con A

“…However, these physiological stresses are overcome in the presence of biocompatible ionic liquid (ILs) [15][16][17]. Main advantages of ILs as compared to common molecular organic solvents are negligible vapor pressure, high ionic conductivity, low toxicity, reduced inhalator exposure, absence of flammability and high variability concerning chemical structure of headgroups, substituents and anions [18][19][20][21][22]. Recently, ILs are finding broader scope within the chemical sciences, including pharmaceutical, enzymatic, biosensors and bioanalytical applications [18][19][20][21][22][23].…”

“…Main advantages of ILs as compared to common molecular organic solvents are negligible vapor pressure, high ionic conductivity, low toxicity, reduced inhalator exposure, absence of flammability and high variability concerning chemical structure of headgroups, substituents and anions [18][19][20][21][22]. Recently, ILs are finding broader scope within the chemical sciences, including pharmaceutical, enzymatic, biosensors and bioanalytical applications [18][19][20][21][22][23]. Moreover, ILs were reported to be effective biocompatible media for not only stabilization of the native structure of biomolecules [24][25][26][27][28][29][30][31], but also for refolding additive of denatured protein [7,24].…”

Densities and ultrasonic speed of 2-hydroxy-5-methyl-3-nitro acetophenone in N,N-dimethylformamide at different temperatures

“…DMF is actually a electron pairs donors from its nitrogen atom and this also favors because of the presence of two electrons repelling -CH 3 groups. This makes the lone pair at nitrogen more perceptible towards donation [21], whereas ketones are electron acceptors [22]. Hence electron donor-acceptor complex between the vacant 2p orbital of the oxygen atom of carbonyl group of ketone and lone pair electrons on nitrogen in DMF is of sensitive towards various types of molecular interactions occurring in solution [23,24].…”

Effect of Ionic Liquids on the Physical Properties of the Newly Synthesized Conducting Polymer

“…Ionic liquids (ILs) are promising materials in the field of chemistry [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. They can be synthesized with various combinations of anion and cation [26][27][28][29] and have a wide range of the potential window, good electrochemical stability, and high ionic conductivity [14,17].…”