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
N-methylformamideC2H5NO0.620.800.90amide
tributyl phosphateC12H27O4P0.000.800.65
octanolC8H18O0.770.810.40alcohol
thiolane-1-oxideC4H8OS0.000.811.06
decanolC10H22O0.700.820.45alcohol
2-methyl-1-propanolC4H10O0.790.840.40alcohol
2-propanolC3H8O0.760.840.48alcohol
butanolC4H10O0.840.840.47alcohol
cyclohexanolC6H12O0.660.840.45alcohol
hexanolC6H14O0.800.840.40alcohol
N,N-dimethylcyclohexylamineC8H17N0.000.840.23amine
1,1,3,3-tetramethylguanidineC5H13N30.000.860.76
3-methyl-1-butanolC5H12O0.840.860.40alcohol
pentanol     ⋮0.840.860.40alcohol
2-propen-1-olC3H6O0.840.900.52alcohol
propanolC3H8O0.840.900.52alcohol
2-methyl-2-butanolC5H12O0.280.930.40alcohol
2-methyl-2-propanolC4H10O0.420.930.41alcohol
1-ethyl-3-methylimidazolium acetateC8H14N2O20.400.951.09
piperidineC5H11N0.001.040.30amine
hexamethylphosphoramideC6H18N3OP0.001.050.87
1,2-diaminoethaneC2H8N20.131.430.47amine