Solute-solvent and solvent-solvent interactions evaluated through clusters isolated from solutions: Preferential solvation in water-alcohol mixtures

Wakisaka, Akihiro; Komatsu, Shintaro; Usui, Yoshiharu

doi:10.1016/s0167-7322(01)00120-9

Cited by 117 publications

(82 citation statements)

References 13 publications

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“…As transfer free energy is a reflection of the difference in the solvation of the solute in the two solvents, a consideration of the solvation of the amino acid residues in methanol/ethanol-water mixtures and their evolution as methanol/ethanol concentration increase is essential to reveal the mechanism of conformational transition of SF. Recently, Wakisaka et al 25 interpreted the fluorescence properties of several fluorescence molecules and the rate constant of hydrolysis of tert-butylchloride in aqueous alcohol, on the basis of the cluster analysis of the solvent, and suggested that the solvation in alcohol-water mixtures was controlled by the clustering structure of the mixed solvent. Methanol and ethanol are miscible with water in any proportion; however, extensive studies suggest an incomplete mixing of alcohol-water at microscopic level and a strong self-association between alcohol and water molecules through hydrogen bonding.…”

Section: Relationship Between Microstructure Of Alcoholwater Mixturesmentioning

confidence: 99%

Mechanism of Conformational Transition of Silk Fibroin in Alcohol‐water Mixtures

Huang

et al. 2011

Chin. J. Chem.

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Circular dichroism, intrinsic fluorescence of protein and exogenous fluorescence probe of 8-anilino-1-naphthalenesulfonic acid hemimagnesium salt (ANS) was used to investigate the mechanism of conformational change of silk fibroin (SF) in aqueous alcohol including methanol and ethanol. The conformational transition of SF from random coil to β-sheet was found to be of a close relationship with the microstructure of the solvent. The alcohol-water mixture at low concentration had little effect on the solvation of the peptide unit, as the inherent water structure was conserved. At high alcohol concentration, the transition from the tetrahedral-like water structure to the chain-like alcohol structure in the mixtures induced a β-sheet conformation of SF, as a result of the formation of intramolecular hydrogen bond between the peptide units in order to eliminate the thermodynamic unfavorite from the contact to the solvent molecules. Meanwhile, the aggregating of hydrophobic side chains was decreased by the alcohol via the destruction of hydrogen bond network of water by alcohol and the binding of alcohol to hydrophobic group.

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Section: Relationship Between Microstructure Of Alcoholwater Mixturesmentioning

confidence: 99%

Mechanism of Conformational Transition of Silk Fibroin in Alcohol‐water Mixtures

Huang

et al. 2011

Chin. J. Chem.

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“…The increase in the viscosity made the system to have lesser conductivity. On the basis of the mass spectra for alcohol water mixtures measured at various the mole ratios, three regions I, II and III were observed [31] as shown in Figure 3. In region I, the alcohol molecules are existing as a part of inherent hydrogen bonding network of water.…”

Section: Resultsmentioning

confidence: 99%

“…The influence of various temperatures on conductivity measurement can give detailed information of ion-ion and ion-solvent interaction for different electrolytes solution [18][19][20][21][22][23][24][25][26][27][28][29][30]. Molecular associations in liquid system and their variations with composition and temperature were studied by thermodynamic data [31][32][33][34][35][36][37][38]. Transition metals occupy the space between group II and group III of the periodic table and due to their unique physical and chemical properties are of great interest.…”

Section: Introductionmentioning

confidence: 99%

Conductometric, spectrophotometric and thermodynamic studies of nickel sulfate in aqueous polyvinyl alcohol + methanol systems at different temperatures

2015

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The electrical conductance of nickel sulfate (NiSO4.6H2O) solutions in aqueous, aqueous polyvinyl alcohol (PVOH; 0.1, 0.5 and 0.9 g/dL), aqueous methanol (CH3OH) system (30%, v:v) and aqueous PVOH+CH3OH systems were measured in the concentration ranges 0.4×10 -2 to 10×10 -2 mol/L, at different temperatures (298, 303, 308, 313 and 318 K). Ionic interactions of nickel sulfate in aqueous and mixed solvent systems were measured by conductometric analysis. Different relations were used to evaluate conductometric data, for the calculation of molar conductance, molar conductance at infinite dilution (Ʌ°m), degree of dissociation (), dissociation constant (Kd) and Walden product. The increased in Ʌ°m values with the increase in percent composition of aqueous PVOH, show that PVOH interaction with solvents (water and methanol) was higher as compare to PVOH interaction with NiSO4. Solvent effect was also studied by spectrophotometric analysis of NiSO4 in aqueous, aqueous PVOH and aqueous PVOH + CH3OH system. Thermodynamic parameters for dissociation process such as energy of activation (Ea # ), free energy change of activation (ΔGd # ), enthalpy change of activation (ΔHd # ), and entropy change of activation (ΔSd # ) were also calculated as a function of temperature and solvent composition.

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“…[49] mixed solvent and interactions of cyclic ether molecules with molecules, which are components of the mixture. Based on the mass spectroscopic analysis of clusters in alcohol-water mixtures, Wakisaka et al [52] suggest that the preferential solvation of a hydrophobic substance by alcohol molecules in the mixture of methanol and water is promoted by the alcohol self-aggregation in the solution within the region of medium and high methanol contents.…”

Section: Methodsmentioning

confidence: 99%

Effect of base–acid properties of the mixtures of water with methanol on the solution enthalpy of selected cyclic ethers in this mixture at 298.15 K

Jóźwiak

Warczakowska

2015

J Therm Anal Calorim

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The enthalpies of solution of cyclic ethers: 1,4-dioxane, 12-crown-4 and 18-crown-6 in the mixture of water and methanol have been measured within the whole mole fraction range at T = 298.15 K. Based on the obtained data, the effect of base-acid properties of watermethanol mixtures on the solution enthalpy of cyclic ethers in these mixtures has been analyzed. The solution enthalpy of cyclic ethers depends on acid properties of watermethanol mixtures in the range of high and medium water contents in the mixture. Based on the analysis performed, it can be assumed that in the mixtures of high methanol contents, cyclic ether molecules are preferentially solvated by water molecules.

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Solute-solvent and solvent-solvent interactions evaluated through clusters isolated from solutions: Preferential solvation in water-alcohol mixtures

Cited by 117 publications

References 13 publications

Mechanism of Conformational Transition of Silk Fibroin in Alcohol‐water Mixtures

Mechanism of Conformational Transition of Silk Fibroin in Alcohol‐water Mixtures

Conductometric, spectrophotometric and thermodynamic studies of nickel sulfate in aqueous polyvinyl alcohol + methanol systems at different temperatures

Effect of base–acid properties of the mixtures of water with methanol on the solution enthalpy of selected cyclic ethers in this mixture at 298.15 K

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