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
N,N-dimethylformamideC3H7NO0.000.690.88amide
N-methylacetamide     ⋮0.470.801.01amide
N-methylanilineC7H9N0.170.470.82amine aromatic
N-methylformamideC2H5NO0.620.800.90amide
N-methylpyrrolidoneC5H9NO0.000.770.92amide
nitrobenzeneC6H5NO20.000.301.01nitro aromatic
nitromethaneCH3NO20.220.060.85nitro
octadecafluoronaphthaleneC10F180.00-0.05-0.32aromatic halo
octaneC8H180.000.000.01alkane
octanolC8H18O0.770.810.40alcohol
oxaneC5H10O0.000.540.51ether
oxolan-2-oneC4H6O20.000.490.87ester
pentafluoropyridineC5F5N0.000.160.53halo heteroaromatic
pentaneC5H120.000.00-0.08alkane
pentanoic acidC5H10O21.190.450.54
pentanolC5H12O0.840.860.40alcohol
perfluoro(methylcyclohexane)C7F140.00-0.06-0.40halo
phenolC6H6O1.650.300.72
piperidineC5H11N0.001.040.30amine
propanenitrileC3H5N0.000.390.71nitrile
propanoic acidC3H6O21.120.450.58
propanolC3H8O0.840.900.52alcohol
propyl acetateC5H10O20.000.40ester
pyridineC5H5N0.000.640.87heteroaromatic
pyrrolidineC4H9N0.160.700.39