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
2-pentanoneC5H10O0.000.520.65ketone
2-phenylacetonitrileC8H7N0.000.411.00aromatic nitrile
2-phenylethanolC8H10O0.640.610.88aromatic alcohol
2-propanolC3H8O0.760.840.48alcohol
2-propanoneC3H6O0.080.430.71ketone
2-propen-1-ol     ⋮0.840.900.52alcohol
2-pyrrolidoneC4H7NO0.360.770.85amide
3,4-dimethylpyridineC7H9N0.000.780.73heteroaromatic
3-bromopyridineC5H4BrN0.000.600.89halo heteroaromatic
3-chlorophenolC6H5ClO1.570.230.77
3-methyl-1-butanolC5H12O0.840.860.40alcohol
3-methyl-1-octyl-1H-imidazol-3-ium bis[(trifluoromethyl)sulfonyl]azanideC14H23F6N3O4S20.970.280.97
3-methylphenolC7H8O1.130.340.68
3-pentanoneC5H10O0.000.450.72ketone
3-phenylpropanolC9H12O0.530.550.95aromatic alcohol
4-methyl-2-oxo-1,3-dioxolaneC4H6O30.000.400.83ester
4-methyl-2-pentanoneC6H12O0.020.480.65ketone
4-methylphenolC7H8O1.640.340.68
4-methylpyridineC6H7N0.000.670.84heteroaromatic
acetic acidC2H4O21.120.450.64carboxylic_acid
acetic anhydrideC4H6O30.000.290.76
acetonitrileC2H3N0.190.400.75nitrile
acetophenoneC8H8O0.040.490.90aromatic ketone
anilineC6H7N0.260.500.73aromatic amine
benzeneC6H60.000.100.59aromatic