Cryoscopic and dynamic study of the molten system fluoroacetamide-sodium trifluoroacetate

Medium decoupling of dynamics at temperatures ∼100 K above glass-transition temperature: A case study with (acetamide + lithium bromide/nitrate) melts

“…Presence of microheterogeneity in solution structure was suggested earlier by viscoelastic, 11,27 ultrasonic, 3, 26 nuclear magnetic resonance, 10 and dielectric relaxation (DR) 3, 12 experiments with (amide + salt) melts. A model solution structure consisting of salt domains, amorphous amide, and amide interacting with ions was proposed 13 in order to uniformly explain the relaxation characteristics revealed by the above experiments.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Acetamide has been one of the most frequently used amides because of its unique solvating power [14][15][16][17][18][19] which arises due to the presence of several functional groups, high molecular dipole moment (3.7 D), and fairly large static dielectric constant (ε 0 ≈ 60) 17 in molten state (melting point ∼353 K, boiling point ∼495 K). These interesting solvent properties coupled with a wide thermal window have made molten mixtures of (acetamide + electrolyte) to be used not only as reaction media in chemical industry but also as materials for electrochemical applications at elevated temperatures.…”

Temperature-Dependent Dielectric Relaxation in Ionic Acetamide Deep Eutectics: Partial Viscosity Decoupling and Explanations from the Simulated Single-Particle Reorientation Dynamics and Hydrogen-Bond Fluctuations

“…The importance of such an understanding arises because several medium properties, such as polarity, viscosity, and conductivity, can play key roles in deciding the rate of a reaction occurring in them. 12−16 resonance, 17 viscoelastic, 18 ultrasonic, 19 and dielectric relaxation (DR) studies 20,21 have revealed the presence of microheterogeneity in the medium. Moreover, in several of these previous studies, the formation of a polymeric structure or domain in acetamide (CH 3 CONH 2 )-based ionic DESs has been invoked to explain the ultraslow (millisecond−microsecond regime) relaxation processes.…”

“…Although deep eutectics offer solvents with exquisite physicochemical properties and possess a strong potential for industrial applications, the interconnection between the structure and dynamics of these media is still largely unexplored. The importance of such an understanding arises because several medium properties, such as polarity, viscosity, and conductivity, can play key roles in deciding the rate of a reaction occurring in them. − Earlier nuclear magnetic resonance, viscoelastic, ultrasonic, and dielectric relaxation (DR) studies , have revealed the presence of microheterogeneity in the medium. Moreover, in several of these previous studies, the formation of a polymeric structure or domain in acetamide (CH 3 CONH 2 )-based ionic DESs has been invoked to explain the ultraslow (millisecond–microsecond regime) relaxation processes.…”

Glass transition dynamics and conductivity scaling in ionic deep eutectic solvents: The case of (acetamide + lithium nitrate/sodium thiocyanate) melts

“…In particular, when acetamide (CH 3 CONH 2 ) mixed with inorganic salts yield liquids near room temperature with outstanding affinity to supercool and has unique solvating feature. [23][24][25][26] Moreover, the supercooling phenomenon also depends on the nature of the ion content in the mixture. Acetamide is dielectrically rigid and exhibits noncentrosysmmetric molecular ordering that permits high dipole moment of magnitude 3.7 D in the molecule.…”