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
quinolineC9H7N0.000.640.92aromatic heteroaromatic
styreneC8H80.000.12alkene aromatic
sulfolaneC4H8O2S0.000.390.98
tetrachloroetheneC2Cl40.000.050.28halo
tetrachloromethaneCCl40.000.100.28halo
tetradecafluorohexaneC6F140.00-0.08-0.41halo
tetrahydrofuranC4H8O0.000.550.58ether
tetramethylsilaneC4H12Si0.000.02-0.09
thianeC5H10S0.000.360.61
thiolaneC4H8S0.000.440.62
thiolane-1-oxideC4H8OS0.000.811.06
tolueneC7H80.000.110.54aromatic
trans-1,2-dichloroetheneC2H2Cl20.000.000.44alkene halo
tribromomethaneCHBr30.050.050.62halo
tributyl phosphateC12H27O4P0.000.800.65
tributylamineC12H27N0.000.620.16amine
trichloroetheneC2HCl30.000.050.53halo alkene
trichloromethaneCHCl30.200.100.58halo
triethyl phosphateC6H15O4P0.000.770.72
triethylamineC6H15N0.000.710.14amine
trimethyl phosphateC3H9O4P0.000.770.72
waterH2O1.170.471.09