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
diisopropyl etherC6H14O0.000.490.27ether
oxolan-2-oneC4H6O20.000.490.87ester
anilineC6H7N0.260.500.73aromatic amine
1,2,3-propanetriolC3H8O31.210.510.62alcohol
2-fluoropyridineC5H4FN0.000.510.84halo heteroaromatic
2-pentanoneC5H10O0.000.520.65ketone
benzyl alcoholC7H8O0.600.520.98aromatic alcohol
cyclopentanoneC5H8O0.000.520.76ketone
ethanediolC2H6O20.900.520.92alcohol
2-bromopyridineC5H4BrN0.000.531.00halo heteroaromatic
2-chloroethanolC2H5ClO1.280.530.46halo alcohol
cyclohexanoneC6H10O0.000.530.76ketone
oxaneC5H10O0.000.540.51ether
3-phenylpropanolC9H12O0.530.550.95aromatic alcohol
tetrahydrofuranC4H8O0.000.550.58ether
3-bromopyridineC5H4BrN0.000.600.89halo heteroaromatic
1,3,3-trimethyl-2-oxabicyclo[2.2.2]octaneC10H18O0.000.61ether
2-phenylethanolC8H10O0.640.610.88aromatic alcohol
tributylamineC12H27N0.000.620.16amine
dimethylcyanamideC3H6N20.000.640.72
N,N-dimethylbenzylamineC9H13N0.000.640.45amine aromatic
pyridineC5H5N0.000.640.87heteroaromatic
quinolineC9H7N0.000.640.92aromatic heteroaromatic
1-ethyl-3-methylimidazolium nitrateC6H11N3O30.480.661.13
methanolCH4O0.980.660.60alcohol