Determining Dielectric Constants for Complex Solvent Mixtures by Microwave Sensing and Model Prediction

2021 ◽  
Author(s):  
Shixuan Zeng ◽  
Adam Trontz ◽  
Hai Xiao ◽  
Junhang Dong
Keyword(s):  
Model Prediction ◽  
Dielectric Constants ◽  
Solvent Mixtures

Excess properties of the binary liquid systems dimethylsulfoxide + isopropanol and propylene carbonate + isopropanol

1989 ◽  
Vol 67 (6) ◽  
pp. 1105-1108 ◽  
Author(s):  
George Ritzoulis
Keyword(s):  
Dielectric Constant ◽  
Propylene Carbonate ◽  
Binary Systems ◽  
Correlation Factor ◽  
Dielectric Constants ◽  
Excess Properties ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Liquid Systems ◽  
Mole Fraction Range

The dielectric constants, viscosities, densities, and refractive indices of the binary solvent mixtures dimethylsulfoxide–isopropanol and propylene carbonate–isopropanol were measured at 25, 30, and 35 °C over the entire mole fraction range. Excess dielectric constant, excess molar polarization, and excess viscosity were calculated. For both binary systems the variation of the Kirkwood correlation factor has been examined. Keywords: propylene carbonate, acetonitrile, correlation factor, excess properties, dielectric constant.

Conductance studies in amide–water mixtures. VI. Nitrates of sodium, potassium, and ammonium in N,N-dimethylformamide–water mixtures at 25 °C

1984 ◽  
Vol 62 (6) ◽  
pp. 1051-1056 ◽  
Author(s):  
Lal Bahadur ◽  
M. V. Ramanamurti
Keyword(s):  
Association Constant ◽  
Solvent Mixture ◽  
Dielectric Constants ◽  
Solvent Mixtures ◽  
Walden Product ◽  
Sodium Potassium ◽  
Conductance Data ◽  
Walden Products ◽  
Pass Through ◽  
Limiting Equivalent Conductances

Conductance data for the nitrates of sodium, potassium, and ammonium in N,N-dimethylformamide (DMF) – water mixtures (74.39 ≥ D ≥ 36.11) at 25 °C are reported for the concentration range 0.0003–0.06 mol dm−3. Also densities, viscosities, and dielectric constants of the solvent mixture (DMF–water) are reported at the same temperature. The data have been analysed by the Fuoss (1978) equation excluding the term α. The existence of a maximum in the viscosity at a 1:3 mol ratio of DMF and water is attributed to the formation of a solvated complex DMF•3H2O. The Walden products for all the three salts pass through a maximum while the equivalent conductances show a minimum with the change of DMF content in the solvent mixtures. In any given solvent mixture, the limiting equivalent conductances show the trend NaNO3 < KNO3 < NH4NO3. The existence of a maximum in Walden product is attributed to the dehydration of ions due to presence of the cosolvent (DMF). For all the three salts, the association constant was negligible (KA < 10) in all the solvent mixtures studied.

scholarly journals Magnetic field effect on exciplex-forming organic acceptor/donor system: a powerful tool for understanding the preferential solvation

2016 ◽  
Vol 19 (3) ◽  
pp. 65-75
Author(s):  
Hao Minh Hoang ◽  
Van Thi Bich Pham
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Preferential Solvation ◽  
Magnetic Field Effect ◽  
Solvation Shell ◽  
Dielectric Constants ◽  
Binary Solvents ◽  
Charge Transfer Complexes ◽  
Solvent Mixtures ◽  
Magnetic Field Effects

Many acceptor/donor systems can form excited-state charge-transfer complexes (exciplexes) in photo-induced electron transfer reactions. Exciplex can be detected by their luminescence. In addition, the exciplex luminescence is magneto-sensitive. Here, we employ an approach based on the magnetic field effect on the exciplex of 9,10- dimethylanthracene/N,N-dimethylaniline pair in micro-homogeneous and micro-heterogeneous binary solvents to investigate the effects of the preferential solvation processes on solute molecules in solutions. Micro-homogeneous solvent mixtures of propyl acetate (PA)/butyronitrile (BN) allow for a systematic variation of the static dielectric constants, s , in the range from 6.0 to 24.6. The mixtures of toluene (TO)/dimethylsulfoxide (DMSO) with varying the s values in the range from 4.3 to 15.5 are used as micro-heterogeneous binary solvents. In micro-heterogeneous environment, DMSO molecules get preferentially favoured in the solvation shell, forming micro-clusters surrounding the solute molecules. This solvation effect is reflected in the altered magnetic field effects, lifetimes and dissociation rate constants of the exciplexes.

scholarly journals Solvent dielectric effect on electrochemical properties of 3,4-propylenedioxythiophene

2021 ◽  
Author(s):  
Keziban Huner ◽  
Abdulkadir Sezai Sarac
Keyword(s):  
Dielectric Constant ◽  
Electrochemical Properties ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Dielectric Constants ◽  
Solvent Mixtures ◽  
Carbon Fiber Microelectrode ◽  
Dielectric Effect ◽  
Constant E

The present study is focused on the electrochemical properties of poly(3,4-propylene­dioxy­thiophene) (Poly(ProDOT)), electrocoated on the single carbon-fiber microelectrode (SCFME) in different electrolytic media, with different solvent dielectric constants (35.9, 41.7, 47.5, 53.3, 59.1 and 64.9). The highest deposition charge density of 24.49 mC cm-2 and the highest specific capacitance of 23.17 mF cm-2 were obtained for Poly(ProDOT) synthesized in a medium with the lowest solvent dielectric constant (e = 35.9). Electrochemical impedance spectroscopy (EIS) results of Poly(ProDOT) coated SCFME measured at open circuit potential showed continuously increased impedance magnitudes as ε was increased from 35.9 to 59.1. For all films, almost capacitive impedance responses at lower frequencies at least were obtained. The highest capacitance was observed for the polymer film synthesized in the medium of e = 35.9. The impedance of this film was also measured in different solvent mixtures with different dielectric constants at open circuit potential.

Dielectric Constants of Some Miscible Aqueous-Organic Solvent Mixtures

1998 ◽  
Vol 36 (2) ◽  
pp. 105-112 ◽  
Author(s):  
B. R. Pujari ◽  
B. Barik ◽  
B. Behera
Keyword(s):  
Organic Solvent ◽  
Dielectric Constants ◽  
Solvent Mixtures

Stability of Aspartame in Water:Organic Solvent Mixtures with Different Dielectric Constants

1991 ◽  
Vol 80 (7) ◽  
pp. 674-676 ◽  
Author(s):  
Sanyude Sanyude ◽  
Robert A. Locock ◽  
Louis A. Pagliaro
Keyword(s):  
Dielectric Constants ◽  
Solvent Mixtures

A comprehensive QSPR model for dielectric constants of binary solvent mixtures

2016 ◽  
Vol 27 (3) ◽  
pp. 165-181 ◽  
Author(s):  
S. Soltanpour ◽  
M. Shahbazy ◽  
N. Omidikia ◽  
M. Kompany-Zareh ◽  
M. Taghi Baharifard
Keyword(s):  
Dielectric Constants ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Qspr Model ◽  
Binary Solvent Mixtures

Thermodynamical, structural, and dielectric properties of molecular liquids from integral equation theories and from simulations

2004 ◽  
Vol 76 (1) ◽  
pp. 63-70 ◽  
Author(s):  
H. Krienke
Keyword(s):  
Integral Equation ◽  
Correlation Functions ◽  
Pair Correlation ◽  
Distribution Functions ◽  
Dielectric Constants ◽  
Solvent Mixtures ◽  
Molecular Liquids ◽  
Pair Correlation Functions ◽  
Molecular Pair ◽  
Theoretical Approaches

A survey is given on our attempts to calculate equilibrium properties of molecular liquids (pure solvents and electrolyte solutions) with the help of spatial pair correlation functions, starting from classical molecular pair interactions. The selection of potential models, especially the influence of molecular polarizability, is discussed as well as the limitations of the different methods of calculation of molecular pair correlation functions (e.g., from molecular and site-site Ornstein-Zernike theories, from MC and from MD simulations). We have performed simulations and integral equation calculations for spatial distribution functions in pure solvents with very low dielectric constants as dioxane and tetrahydrofurane, up to solvents with a very high dielectric constant like n-methylformamide. Ionic solvation is studied in pure solvent systems as well as in solvent mixtures. The general features of ion solvation and association, of the solvent structure around solutes, and their influence on solution properties, are discussed in the framework of the different theoretical approaches.

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