Gutmann acceptor and donor numbers

The Gutmann Acceptor- (AN) and Donor Number (DN) are measures of the strength of solvents as Lewis acids or bases.
The Acceptor Number is based on the 31P-NMR chemical shift of triethylphosphine oxide in the solvent.
The Donor Number is based on the heat of reaction between the compound dissolved in CH2ClCH2Cl and SbCl5, and is therefore a 'solute' rather than a 'solvent' scale. Because SbCl5 is decomposed by protic compounds, e.g. alcohols, the Donor Numbers for these have to be determined by indirect methods.

The Acceptor Number is a measure of hydrogen bond acidity and correlated with other hydrogen bond acidity scales such as → Dimroth-Reichardt ET (→ ET vs AN) and → Swain Acity (→ Acity vs AN). Correlation with → Kamlet-Taft α and → Catal├ín SA is weaker.
The Donor Number is correlated with → Kamlet-Taft β (→ β vs DN).

See → "The donor-acceptor approach to molecular interactions" by V. Gutmann, Plenum Press, New York and London (1978), and →Lewis donor strength for scales of Lewis bases.

Note: AN values in parenthesis are estimated from the corresponding Dimroth-Reichardt ET-values.

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NameFormulaAcceptor number
AN
Donor number
DN
🏷 Tag
1,2-dichloroethaneC2H4Cl216.70.0halo;
cyclohexaneC6H12(0.0)0.0alkane; cycloalkane;
heptaneC7H160.00.0alkane;
hexaneC6H140.00.0alkane;
tetrachloromethaneCCl48.60.0halo;
benzeneC6H68.20.1aromatic;
sulfuryl chlorideCl2O2S0.1
tolueneC7H8(1.8)0.1aromatic;
thionyl chlorideCl2OS0.4
acetyl chlorideC2H3ClO0.7
4,4,5,5-tetrachloro-1,3-dioxolan-2-oneC3Cl4O30.8
dichloromethaneCH2Cl220.41.0halo;
1,3-dichlorobenzeneC6H4Cl2(7.1)2.0aromatic; halo;
benzoyl fluorideC7H5FO2.0
carbon disulfideCS2(0.0)2.0
benzoyl chlorideC7H5ClO2.3
methyl trifluoroacetateC3H3F3O22.7ester; halo;
nitromethaneCH3NO220.52.7nitro;
1,2-dichlorobenzeneC6H4Cl2(9.5)3.0aromatic; halo;
bromobenzeneC6H5Br(6.9)3.0aromatic; halo;
fluorobenzeneC6H5F(7.7)3.0aromatic; halo; fluoro;
ethyl trichloroacetateC4H5Cl3O2(10.9)3.1halo; ester;
4,5-dichloro-1,3-dioxolan-2-oneC3H2Cl2O316.73.2
propanoyl chlorideC3H5ClO3.2
chlorobenzeneC6H5Cl(7.3)3.3aromatic; halo;