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.

Lines 126-150 of 224

NameFormulaAcceptor number
AN
Donor number
DN
🏷 Tag
ethyl chloroformateC3H5ClO221.3halo; ester;
ethyl dichloroacetateC4H6Cl2O29.4ester; halo;
ethyl formateC3H6O2(15.0)17.0ester;
ethyl propanoateC5H10O217.1ester;
ethyl trichloroacetateC4H5Cl3O2(10.9)3.1halo; ester;
ethylamineC2H7N55.0amine;
ethylamino-dipyrrolidinophosphine oxideC10H22N3OP42.6
ethylbenzeneC8H106.0aromatic;
fluorobenzeneC6H5F(7.7)3.0aromatic; halo; fluoro;
formamideCH3NO39.824.0amide;
formic acidCH2O283.619.0carboxylic_acid;
furanC4H4O(5.8)6.0heteroaromatic;
heptaneC7H160.00.0alkane;
hexaethylphosphoramideC12H30N3OP36.6
hexamethylphosphoramideC6H18N3OP10.638.8
hexaneC6H140.00.0alkane;
hexanolC6H14O(29.9)30.0alcohol;
hydrazineH4N244.0
iodobenzeneC6H5I(6.2)4.0aromatic; halo;
isopropyl 2,2-dimethylpropanoateC8H16O213.5ester;
isopropyl acetateC5H10O217.5ester;
isopropyl pivalateC8H16O213.5
methanesulfonic acidCH4O3S126.3
methanolCH4O41.519.0alcohol;
methoxybenzeneC7H8O(7.8)9.0aromatic; ether;