Kamlet-Taft solvent parameters

There are three Kamlet-Taft solvent parameters: α (hydrogen bond donor), β (hydrogen bond acceptor), and π* (polarizability).
The values of α have been set to 0 for solvents that are assumed to be unable to donate hydrogen bonds. This truncation at 0 is the main reason it differs from other measures of hydrogen bond acidity such as ET and AN.

Occasionally a "polarity correction term" (fudge factor), δ, is seen in correlations. For aromatics δ=1.0, for polychlorinated compounds δ=0.5, and for all other solvents δ=0.0 . If possible this type of ad hoc parameters should be avoided and separate correlations used for different solvent classes.

α is correlated with →Dimroth-Reichardt ET (→ET vs α) and →Gutmann AN (→AN vs α).
β is correlated with →Gutmann DN (→DN vs β) except for amines and sulfides.
π* is correlated with →Catal├ín SPP (→SPP vs π*).

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NameFormulaαβπ*🏷 Tag
tetradecafluorohexaneC6F140.00-0.08-0.41halo
perfluoro(methylcyclohexane)C7F140.00-0.06-0.40halo
octadecafluoronaphthaleneC10F180.00-0.05-0.32aromatic halo
1,1,1,3,3,3-hexafluoro-2-propanolC3H2F6O1.960.000.65halo alcohol
1,1,1-trichloroethaneC2H3Cl30.000.000.49halo
1,1,2,2-tetrachloroethaneC2H2Cl40.000.000.95halo
1,2-dibromoethaneC2H4Br20.000.000.75halo
1-chlorobutaneC4H9Cl0.000.000.39halo
2,2,2-trifluoroethanolC2H3F3O1.510.000.73halo alcohol
cyclohexaneC6H120.000.000.00alkane cycloalkane
decaneC10H220.000.000.03alkane
dibromomethaneCH2Br20.000.000.92halo
diiodomethaneCH2I20.000.000.65halo
dodecaneC12H260.000.000.05alkane
heptaneC7H160.000.00-0.08alkane
hexaneC6H140.000.00-0.04alkane
octaneC8H180.000.000.01alkane
pentaneC5H120.000.00-0.08alkane
trans-1,2-dichloroetheneC2H2Cl20.000.000.44alkene halo
2-methylbutaneC5H120.000.01-0.08alkane
hexafluorobenzeneC6F60.000.020.33aromatic halo
tetramethylsilaneC4H12Si0.000.02-0.09
1,2-dichlorobenzeneC6H4Cl20.000.030.80aromatic halo
1,3-dichlorobenzene     ⋮0.000.030.75aromatic halo
1,4-difluorobenzeneC6H4F20.000.030.58aromatic halo