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
waterH2O1.170.471.09
tetrachloromethaneCCl40.000.100.28halo
carbon disulfideCS20.000.070.61
tribromomethaneCHBr30.050.050.62halo
trichloromethaneCHCl30.200.100.58halo
dibromomethaneCH2Br20.000.000.92halo
dichloromethaneCH2Cl20.130.100.82halo
diiodomethaneCH2I20.000.000.65halo
formic acidCH2O21.230.380.65carboxylic_acid
formamideCH3NO0.710.480.97amide
nitromethaneCH3NO20.220.060.85nitro
methanolCH4O0.980.660.60alcohol
tetrachloroetheneC2Cl40.000.050.28halo
trichloroetheneC2HCl30.000.050.53halo alkene
chloroacetonitrileC2H2ClN0.000.341.01halo nitrile
trans-1,2-dichloroetheneC2H2Cl20.000.000.44alkene halo
1,1,2,2-tetrachloroethaneC2H2Cl40.000.000.95halo
1,1,1-trichloroethaneC2H3Cl30.000.000.49halo
2,2,2-trifluoroethanolC2H3F3O1.510.000.73halo alcohol
acetonitrileC2H3N0.190.400.75nitrile
1,2-dibromoethaneC2H4Br20.000.000.75halo
1,1-dichloroethaneC2H4Cl20.100.100.48halo
1,2-dichloroethane     ⋮0.000.100.81halo
acetic acidC2H4O21.120.450.64carboxylic_acid
methyl formate     ⋮0.000.370.62ester