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-trichloroethaneC2H3Cl30.000.000.49halo
1,1,2,2-tetrachloroethaneC2H2Cl40.000.000.95halo
1,1,3,3-tetramethylguanidineC5H13N30.000.860.76
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-chlorobutaneC4H9Cl0.000.000.39halo
1-iodobutaneC4H9I0.000.230.47halo amine
1-methylazepan-2-oneC7H13NO0.000.69amide
2,6-dimethylpyridineC7H9N0.000.760.80heteroaromatic
2-bromopyridineC5H4BrN0.000.531.00halo heteroaromatic
2-cyanopyridineC6H4N20.000.291.20nitrile heteroaromatic
2-fluoropyridineC5H4FN0.000.510.84halo heteroaromatic
2-methylbutaneC5H120.000.01-0.08alkane
2-methyltetrahydrofuranC5H10O0.000.45ether