Add time:09/08/2019 Source:sciencedirect.com
The dilution enthalpies of four chiral diols, namely (2S,4S)-(+)-2,4-pentanediol vs (2R,4R)-(−)-2,4-pentanediol and (2S,5S)-(+)-2,5-hexanediol vs (2R,5R)-(−)-2,5-hexanediol in dimethylsulfoxide (DMSO) + water mixtures at 298.15 K have been determined respectively, using isothermal titration calorimeter (ITC). On the basis of the McMillan–Mayer theory, homochiral enthalpic pairwise interaction coefficients (hxx) of the four diols in the mixed solvents of various mass fractions (w = 0–0.3) have been calculated. It is found amazedly that across the whole studied composition range of mixed solvent values of hxx for S-enantiomer are almost higher than R-enantiomer for each diol. The results are discussed from the point of view of solute–solute interaction and solute–solvent interaction accompanied by chiral discrimination effect. The variations of hxx with w for the four chiral diols depend largely on the competition equilibrium between hydrophobic–hydrophobic, hydrophilic–hydrophilic and hydrophobic–hydrophilic interactions in the ternary solution systems.
We also recommend Trading Suppliers and Manufacturers of 2,4-HEXANEDIOL (cas 19780-90-6). Pls Click Website Link as below: cas 19780-90-6 suppliers
About|Contact|Cas|Product Name|Molecular|Country|Encyclopedia
Message|New Cas|MSDS|Service|Advertisement|CAS DataBase|Article Data|Manufacturers | Chemical Catalog
©2008 LookChem.com,License: ICP
NO.:Zhejiang16009103
complaints:service@lookchem.com Desktop View