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
tetrachloroetheneC2Cl40.000.050.28halo
tribromomethaneCHBr30.050.050.62halo
trichloroetheneC2HCl30.000.050.53halo alkene
bromobenzeneC6H5Br0.000.060.79aromatic halo
iodobenzeneC6H5I0.000.060.81aromatic halo
nitromethaneCH3NO20.220.060.85nitro
carbon disulfideCS20.000.070.61
chlorobenzeneC6H5Cl0.000.070.71aromatic halo
fluorobenzeneC6H5F0.000.070.62aromatic halo fluoro
cis-decalinC10H180.000.080.11alkane cycloalkane
1,1-dichloroethaneC2H4Cl20.100.100.48halo
1,2-dichloroethane     ⋮0.000.100.81halo
benzeneC6H60.000.100.59aromatic
dichloromethaneCH2Cl20.130.100.82halo
tetrachloromethaneCCl40.000.100.28halo
trichloromethaneCHCl30.200.100.58halo
tolueneC7H80.000.110.54aromatic
1,3-dimethylbenzeneC8H100.000.110.47aromatic
1,4-dimethylbenzene     ⋮0.000.120.43aromatic
styreneC8H80.000.12alkene aromatic
1,3,5-trimethylbenzeneC9H120.000.130.41aromatic
1-bromobutaneC4H9Br0.000.130.50halo
diphenyl etherC12H10O0.000.130.66aromatic ether
furanC4H4O0.000.14heteroaromatic
pentafluoropyridineC5F5N0.000.160.53halo heteroaromatic