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
formamideCH3NO0.710.480.97amide
formic acidCH2O21.230.380.65carboxylic_acid
furanC4H4O0.000.14heteroaromatic
heptaneC7H160.000.00-0.08alkane
heptanoic acidC7H14O21.200.450.50carboxylic_acid
hexafluorobenzeneC6F60.000.020.33aromatic halo
hexamethylphosphoramideC6H18N3OP0.001.050.87
hexaneC6H140.000.00-0.04alkane
hexanoic acidC6H12O21.220.450.52carboxylic_acid
hexanolC6H14O0.800.840.40alcohol
iodobenzeneC6H5I0.000.060.81aromatic halo
methanolCH4O0.980.660.60alcohol
methoxybenzeneC7H8O0.000.320.73aromatic ether
methyl acetateC3H6O20.000.420.60ester
methyl benzoateC8H8O20.000.38aromatic ester
methyl formateC2H4O20.000.370.62ester
methyl propanoateC4H8O20.000.27ester
morpholineC4H9NO0.290.700.39ether amine
N,N,N',N'-tetramethylureaC5H12N2O0.000.800.83amide
N,N-diethylacetamideC6H13NO0.000.780.84amide
N,N-diethylformamideC5H11NO0.000.79amide
N,N-dimethylacetamideC4H9NO0.000.760.88amide
N,N-dimethylanilineC8H11N0.000.430.73amine aromatic
N,N-dimethylbenzylamineC9H13N0.000.640.45amine aromatic
N,N-dimethylcyclohexylamineC8H17N0.000.840.23amine