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
1,1,1,3,3,3-hexafluoro-2-propanolC3H2F6O1.960.000.65halo alcohol
1,1,1-trichloroethaneC2H3Cl30.000.000.49halo
1,1,2,2-tetrachloroethaneC2H2Cl40.000.000.95halo
1,1,3,3-tetramethylguanidineC5H13N30.000.860.76
1,1-dichloroethaneC2H4Cl20.100.100.48halo
1,2,3-propanetriolC3H8O31.210.510.62alcohol
1,2-diaminoethaneC2H8N20.131.430.47amine
1,2-dibromoethaneC2H4Br20.000.000.75halo
1,2-dichlorobenzeneC6H4Cl20.000.030.80aromatic halo
1,2-dichloroethaneC2H4Cl20.000.100.81halo
1,2-dimethoxyethaneC4H10O20.000.410.53ether
1,3,3-trimethyl-2-oxabicyclo[2.2.2]octaneC10H18O0.000.61ether
1,3,5-trimethylbenzeneC9H120.000.130.41aromatic
1,3-dichlorobenzeneC6H4Cl20.000.030.75aromatic halo
1,3-dimethylbenzeneC8H100.000.110.47aromatic
1,3-dioxolan-2-oneC3H4O30.000.41ester
1,3-dioxolaneC3H6O20.000.450.69
1,4-difluorobenzeneC6H4F20.000.030.58aromatic halo
1,4-dimethylbenzeneC8H100.000.120.43aromatic
1-bromobutaneC4H9Br0.000.130.50halo
1-butyl-3-methyl-1H-imidazol-3-ium trifluoromethanesulfonateC9H15F3N2O3S0.630.461.01
1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imideC10H15F6N3O4S20.620.240.98
1-chlorobutaneC4H9Cl0.000.000.39halo
1-ethyl-3-methyl-1H-imidazol-3-ium dicyanoazanideC8H11N50.530.351.08
1-ethyl-3-methyl-1H-imidazol-3-ium hexafluorophosphateC6H11F6N2P0.760.200.99