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 E_T 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 E_T (→E_T 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 →Catalán SPP (→SPP vs π^*).

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Name	Formula	α	β	π^*	🏷 Tag
4-methylpyridine	C₆H₇N	0.00	0.67	0.84	heteroaromatic
1-methylazepan-2-one	C₇H₁₃NO	0.00	0.69	…	amide
N,N-dimethylformamide	C₃H₇NO	0.00	0.69	0.88	amide
diethylamine	C₄H₁₁N	0.30	0.70	0.24	amine
morpholine	C₄H₉NO	0.29	0.70	0.39	ether amine
pyrrolidine	C₄H₉N	0.16	0.70	0.39
1-ethyl-3-methyl-1H-imidazol-3-ium hexyl sulfate	C₁₂H₂₄N₂O₄S	0.65	0.71	0.98
triethylamine	C₆H₁₅N	0.00	0.71	0.14	amine
butylamine	C₄H₁₁N	0.00	0.72	0.31	amine
ethanol	C₂H₆O	0.86	0.75	0.54	alcohol
2,6-dimethylpyridine	C₇H₉N	0.00	0.76	0.80	heteroaromatic
dimethyl sulfoxide	C₂H₆OS	0.00	0.76	1.00
N,N-dimethylacetamide	C₄H₉NO	0.00	0.76	0.88	amide
1-ethyl-3-methyl-1H-imidazol-3-ium octyl sulfate	C₁₄H₂₈N₂O₄S	0.65	0.77	0.93
2-pyrrolidone	C₄H₇NO	0.36	0.77	0.85	amide
N-methylpyrrolidone	C₅H₉NO	0.00	0.77	0.92	amide
triethyl phosphate	C₆H₁₅O₄P	0.00	0.77	0.72
trimethyl phosphate	C₃H₉O₄P	0.00	0.77	0.72
3,4-dimethylpyridine	C₇H₉N	0.00	0.78	0.73	heteroaromatic
dimethyl phthalate	C₁₀H₁₀O₄	0.00	0.78	0.82	aromatic ester
N,N-diethylacetamide	C₆H₁₃NO	0.00	0.78	0.84	amide
N,N-diethylformamide	C₅H₁₁NO	0.00	0.79	…	amide
2-butanol	C₄H₁₀O	0.69	0.80	0.40	alcohol
N,N,N',N'-tetramethylurea	C₅H₁₂N₂O	0.00	0.80	0.83	amide
N-methylacetamide	C₃H₇NO	0.47	0.80	1.01	amide