Dielectric constant, effect

Selected entries from Methods in Enzymology [vol, page(s)] Buffer capacity, 63, 4 choice, 63, 19, 20, 285 metal ion chelation effects, 63, 225, 226, 287, 298, 299 dielectric constant effect on pK, 63, 226 dilution, 63, 20 equilibrium constant effects, 63, 18 heavy water, 63, 226, 227 ionic strength effects, 63, 226,... 

Very High Temperature HPLC—Dielectric Constant Effects.265... 

VERY HIGH TEMPERATURE HPLC—DIELECTRIC CONSTANT EFFECTS... 

Unlike the dielectric constant effect in aqueous-organic mixtures, the salting-out effect in highly concentrated salt solutions is relatively insensitive to the specific chemical characteristics of the protein and depends mostly on unspecific factors, such as size and shape. 

This increase occurs despite a decrease in dielectric constant, which raises the electrical energy of the ions. If much more acetone is added, the dielectric constant effect becomes predominant and Qa decreases. 

Chen, D.R. and Pui, D.Y.H. (1997) Experimental investigations of scaling laws for electrospray dielectric constant effect. Aerosol Sci. Technology, 27, 367-380. 

The majority of reactions whose kinetics have been discussed in terms of dielectric constant effects have been examined in mixed aqueous solution, but a few studies in series of pure solvents have been described in the past year and a half. Ionization of iodine thiocyanate is slow, and incomplete, in solvents with low dielectric constants,... 

The minor variations shown by carbonyl frequencies in different solvents have been studied in some detail and the results have been reviewed at some length by Bellamy [179]. It seems probable that dielectric-constant effects play some considerable part in the frequency shifts which follow a change from the vapour phase to solution in a non-polar solvent. However, the shifts which result thereafter from a change of solvent are very largely due to association effects, and the extents of the shifts parallel the proton donating abilities of the solvents. In a typical ketone a shift of about 15 cm" results from a solvent change from hexane to chloroform. 

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