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-ethyl-3-methyl-1H-imidazol-3-ium hexyl sulfateC12H24N2O4S0.650.710.98
1-ethyl-3-methyl-1H-imidazol-3-ium octyl sulfateC14H28N2O4S0.650.770.93
1-ethyl-3-methyl-1H-imidazol-3-ium perchlorateC6H11ClN2O40.560.411.11
1-ethyl-3-methylimidazolium acetateC8H14N2O20.400.951.09
1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imideC8H11F6N3O4S20.760.280.90
1-ethyl-3-methylimidazolium nitrateC6H11N3O30.480.661.13
1-ethyl-3-methylimidazolium tetrafluoroborateC6H11BF4N20.700.261.03
1-hexyl-3-methyl-1H-imidazol-3-ium bis[(trifluoromethyl)sulfonyl]azanideC12H19F6N3O4S20.650.250.98
1-iodobutaneC4H9I0.000.230.47halo amine
1-methylazepan-2-oneC7H13NO0.000.69amide
2,2,2-trifluoroethanolC2H3F3O1.510.000.73halo alcohol
2,6-dimethylpyridineC7H9N0.000.760.80heteroaromatic
2-bromopyridineC5H4BrN0.000.531.00halo heteroaromatic
2-butanolC4H10O0.690.800.40alcohol
2-butanoneC4H8O0.060.480.67ketone
2-chloroanilineC6H6ClN0.250.400.83aromatic halo amine
2-chloroethanolC2H5ClO1.280.530.46halo alcohol
2-cyanopyridineC6H4N20.000.291.20nitrile heteroaromatic
2-fluoropyridineC5H4FN0.000.510.84halo heteroaromatic
2-heptanoneC7H14O0.050.480.61ketone
2-methyl-1-propanolC4H10O0.790.840.40alcohol
2-methyl-2-butanolC5H12O0.280.930.40alcohol
2-methyl-2-propanolC4H10O0.420.930.41alcohol
2-methylbutaneC5H120.000.01-0.08alkane
2-methyltetrahydrofuranC5H10O0.000.45ether