Gutmann Acceptor and Donor number

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 heat of reaction between the 'solvent' and SbCl₅ in CH₂ClCH₂Cl .
The Donor number is based on the ³¹P-NMR chemical shift of triethylphosphine oxide in the solvent.

Gutmann's AN and DN values
Name	CAS nr	AN	DN
1,2-dichloroethane	107-06-2	16.7	0
2-methyl-2-propanol	75-65-0	27.1	21.9
2-propanol	67-63-0	33.8	21.1
2-propanone	67-64-1	12.5	17
4-methyl-2-oxo-1,3-dioxolane	108-32-7	18.3	15.1
acetonitrile	75-05-8	18.9	14.1
benzonitrile	100-47-0	15.5	11.9
butanol	71-36-3	36.8	19.5
dichloromethane	75-09-2	20.4	1
dimethyl sulfoxide	67-68-5	19.3	29.8
ethanol	64-17-5	37.9	19.2
formamide	75-12-7	39.8	24
hexamethylphosphoramide	680-31-9	10.6	38.8
hexane	110-54-3	0	0
methanol	67-56-1	41.5	19
N,N-dimethylacetamide	127-19-5	13.6	27.8
N,N-dimethylformamide	68-12-2	16	26.6
N-methylformamide	123-39-7	32.1	27
N-methylpyrrolidone	872-50-4	13.3	27.3
nitrobenzene	98-95-3	14.8	4.4
nitromethane	75-52-5	20.5	2.7
propanol	71-23-8	37.3	19.8
sulfolane	126-33-0	19.2	14.8
tetrachloromethane	56-23-5	8.6	0
trichloromethane	67-66-3	23.1	4
water	7732-18-5	54.8	18

Tables for Chemistry

Gutmann Acceptor and Donor number