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
tetramethylsilaneC4H12Si0.000.02-0.09
2-methylbutaneC5H120.000.01-0.08alkane
heptaneC7H160.000.00-0.08alkane
pentaneC5H120.000.00-0.08alkane
hexaneC6H140.000.00-0.04alkane
cyclohexaneC6H120.000.000.00alkane cycloalkane
octaneC8H180.000.000.01alkane
decaneC10H220.000.000.03alkane
dodecaneC12H260.000.000.05alkane
cis-decalinC10H180.000.080.11alkane cycloalkane
triethylamineC6H15N0.000.710.14amine
tributylamineC12H27N0.000.620.16amine
N,N-dimethylcyclohexylamineC8H17N0.000.840.23amine
diethylamineC4H11N0.300.700.24amine
dibutyl etherC8H18O0.000.460.27ether
diethyl etherC4H10O0.000.470.27ether
diisopropyl etherC6H14O0.000.490.27ether
dipropyl ether     ⋮0.000.460.27ether
tetrachloroetheneC2Cl40.000.050.28halo
tetrachloromethaneCCl40.000.100.28halo
piperidineC5H11N0.001.040.30amine
butylamineC4H11N0.000.720.31amine