Dimroth and Reichardt determined the wavenumber of the absorption
maximum for a betain dye as a measure of the ionizing power of solvents.
It is converted to kcal/mol (2.86x104λ-1)
to give ET.
Normalizing to a scale from TMS (0) to water (1) gives ETN.
See e.g. IUPAC Gold Book.
Dimroth's ET values| Name | CAS nr | ET | ETN | | 1,1,1,3,3,3-hexafluoro-2-propanol | 920-66-1 | 65.3 | 1.07 | | 1,1,1-trichloroethane | 71-55-6 | 36.2 | 0.17 | | 1,1,2,2-tetrachloroethane | 79-34-5 | 39.4 | 0.27 | | 1,1-dichloroethane | 75-34-3 | 39.4 | 0.27 | | 1,2,3-propanetriol | 56-81-5 | 57.0 | 0.81 | | 1,2-diaminoethane | 107-15-3 | 42.0 | 0.35 | | 1,2-dibromoethane | 106-93-4 | 38.3 | 0.23 | | 1,2-dichlorobenzene | 95-50-1 | 38.0 | 0.23 | | 1,2-dichloroethane | 107-06-2 | 41.3 | 0.33 | | 1,2-dimethoxyethane | 110-71-4 | 38.2 | 0.23 | | 1,3,3-trimethyl- 2-oxabicyclo[2,2,2]octane | 470-82-6 | 34.0 | 0.10 | | 1,3,5-trimethylbenzene | 108-67-8 | 32.9 | 0.07 | | 1,3-dichlorobenzene | 541-73-1 | 36.7 | 0.19 | | 1,3-dioxolan-2-one | 96-49-1 | 48.6 | 0.55 | | 1,3-dioxolane | 646-06-0 | 43.1 | 0.38 | | 1,4-difluorobenzene | 540-36-3 | 36.4 | 0.18 | | 1-bromobutane | 109-65-9 | 36.6 | 0.18 | | 1-chlorobutane | 109-69-3 | 36.9 | 0.19 | | 1-iodobutane | 542-69-8 | 34.9 | 0.13 | | 2,2,2-trifluoroethanol | 75-89-8 | 59.8 | 0.90 | | 2,6-dimethylpyridine | 108-48-5 | 36.9 | 0.19 | | 2-bromopyridine | 109-04-6 | 41.3 | 0.33 | | 2-butanol | 78-92-2 | 47.1 | 0.51 | | 2-butanone | 78-93-3 | 41.3 | 0.33 | | 2-chloroaniline | 95-51-2 | 45.5 | 0.46 | | 2-chloroethanol | 107-07-03 | 55.5 | 0.77 | | 2-cyanopyridine | 100-70-9 | 44.2 | 0.42 | | 2-fluoropyridine | 372-48-5 | 42.4 | 0.36 | | 2-heptanone | 110-43-0 | 41.1 | 0.32 | | 2-methyl-1-propanol | 78-83-1 | 48.6 | 0.55 | | 2-methyl-2-butanol | 75-85-4 | 41.1 | 0.32 | | 2-methyl-2-propanol | 75-65-0 | 43.7 | 0.40 | | 2-methyltetrahydrofuran | 96-47-9 | 36.5 | 0.18 | | 2-pentanone | 107-87-9 | 41.1 | 0.32 | | 2-phenylacetonitrile | 140-29-4 | 42.7 | 0.37 | | 2-phenylethanol | 60-12-8 | 49.5 | 0.58 | | 2-propanol | 67-63-0 | 49.2 | 0.57 | | 2-propanone | 67-64-1 | 42.2 | 0.35 | | 2-propen-1-ol | 107-18-6 | 52.1 | 0.66 | | 2-pyrrolidone | 616-45-5 | 48.3 | 0.54 | | 3,4-dimethylpyridine | 583-58-4 | 38.9 | 0.25 | | 3-bromopyridine | 626-55-1 | 39.7 | 0.28 | | 3-chlorophenol | 108-43-0 | 60.8 | 0.93 | | 3-hydroxytoluene | 108-39-4 | 52.8 | 0.68 | | 3-methyl-1-butanol | 123-51-3 | 49.0 | 0.56 | | 3-pentanone | 96-22-0 | 39.3 | 0.27 | | 3-phenylpropanol | 1335-12-2 | 48.5 | 0.55 | | 4-hydroxytoluene | 106-44-5 | 53.3 | 0.70 | | 4-methyl-2-oxo-1,3-dioxolane | 108-32-7 | 46.6 | 0.49 | | 4-methyl-2-pentanone | 108-10-1 | 39.4 | 0.27 | | 4-methylpyridine | 108-89-4 | 39.6 | 0.27 | | acetic acid | 64-19-7 | 55.2 | 0.76 | | acetic anhydride | 108-24-7 | 43.9 | 0.41 | | acetonitrile | 75-05-8 | 45.6 | 0.46 | | acetophenone | 98-86-2 | 40.6 | 0.31 | | aniline | 62-53-3 | 44.3 | 0.42 | | benzene | 71-43-2 | 34.3 | 0.11 | | benzonitrile | 100-47-0 | 41.5 | 0.33 | | benzyl alcohol | 100-51-6 | 50.4 | 0.61 | | bis-(2-chloroethyl) ether | 111-44-4 | 41.6 | 0.34 | | bromobenzene | 108-86-1 | 36.6 | 0.18 | | butanenitrile | 109-74-0 | 43.1 | 0.38 | | butanoic acid | 107-92-6 | 54.4 | 0.73 | | butanol | 71-36-3 | 50.2 | 0.60 | | butyl acetate | 123-86-4 | 38.5 | 0.24 | | butylamine | 109-73-9 | 37.6 | 0.21 | | carbon disulfide | 75-15-0 | 32.8 | 0.06 | | chloroacetonitrile | 107-14-2 | 46.4 | 0.48 | | chlorobenzene | 108-90-7 | 36.8 | 0.19 | | cis-decaline | 493-01-6 | 31.2 | 0.02 | | cyclohexane | 110-82-7 | 30.9 | 0.01 | | cyclohexanol | 108-93-0 | 46.9 | 0.50 | | cyclohexanone | 108-94-1 | 39.8 | 0.28 | | cyclopentanone | 120-92-3 | 39.4 | 0.27 | | decane | 124-18-5 | 31.0 | 0.01 | | decanol | 112-30-1 | 47.7 | 0.52 | | di(2-methoxyethyl) ether | 111-96-6 | 38.6 | 0.24 | | di-n-butyl sulfide | 544-40-1 | 34.9 | 0.13 | | dibenzyl ether | 103-50-4 | 36.3 | 0.17 | | dibromomethane | 74-95-3 | 39.4 | 0.27 | | dibutyl ether | 142-96-1 | 33.0 | 0.07 | | dichloromethane | 75-09-2 | 40.7 | 0.31 | | diethyl carbonate | 105-58-8 | 37.0 | 0.19 | | diethyl ether | 60-29-7 | 34.5 | 0.12 | | diethyl sulfide | 352-93-2 | 35.7 | 0.15 | | diethylamine | 109-89-7 | 35.4 | 0.15 | | diiodomethane | 75-11-6 | 36.5 | 0.18 | | diisopropyl ether | 108-20-3 | 34.0 | 0.10 | | diisopropyl sulfide | 625-80-9 | 34.9 | 0.13 | | dimethyl carbonate | 616-38-6 | 38.8 | 0.25 | | dimethyl phthalate | 131-11-3 | 40.7 | 0.31 | | dimethyl sulfide | 75-18-3 | 26.8 | -0.12 | | dimethyl sulfoxide | 67-68-5 | 45.1 | 0.44 | | dimethylcyanamide | 1467-79-4 | 43.8 | 0.40 | | dioxane | 123-91-1 | 36.0 | 0.16 | | diphenyl ether | 101-84-8 | 35.5 | 0.15 | | dipropyl ether | 111-43-3 | 34.0 | 0.10 | | dodecane | 112-40-3 | 31.1 | 0.01 | | ethanediol | 107-21-1 | 56.3 | 0.79 | | ethanol | 64-17-5 | 51.9 | 0.65 | | ethyl acetate | 141-78-6 | 38.1 | 0.23 | | ethyl benzoate | 93-89-0 | 38.1 | 0.23 | | ethyl chloroacetate | 105-39-5 | 39.4 | 0.27 | | ethyl formate | 109-94-4 | 40.9 | 0.31 | | ethyl phenyl ether | 103-73-1 | 36.6 | 0.18 | | ethyl trichloroacetate | 515-84-4 | 38.7 | 0.25 | | fluorobenzene | 462-06-6 | 37.0 | 0.19 | | formamide | 75-12-7 | 56.6 | 0.80 | | formic acid | 64-18-6 | 57.7 | 0.83 | | furan | 110-00-9 | 36.0 | 0.16 | | heptane | 142-82-5 | 31.1 | 0.01 | | heptanoic acid | 111-14-8 | 55.0 | 0.75 | | hexafluorobenzene | 392-56-3 | 34.2 | 0.11 | | hexamethylphosphoramide | 680-31-9 | 40.9 | 0.31 | | hexane | 110-54-3 | 31.0 | 0.01 | | hexanoic acid | 142-62-1 | 55.4 | 0.76 | | hexanol | 111-27-3 | 48.8 | 0.56 | | iodobenzene | 591-50-4 | 36.2 | 0.17 | | m-xylene | 108-38-3 | 33.3 | 0.08 | | methanol | 67-56-1 | 55.4 | 0.76 | | methoxybenzene | 100-66-3 | 37.1 | 0.20 | | methyl acetate | 79-20-9 | 40.0 | 0.29 | | methyl benzoate | 93-58-3 | 38.1 | 0.23 | | methyl formate | 107-31-3 | 45.0 | 0.44 | | methyl propanoate | 554-12-1 | 38.0 | 0.23 | | methylbutane | 78-78-4 | 30.9 | 0.01 | | morpholine | 110-91-8 | 41.0 | 0.32 | | N,N,N',N'-tetramethylguanidine | 80-70-6 | 39.3 | 0.27 | | N,N,N',N'-tetramethylurea | 632-22-4 | 41.0 | 0.32 | | N,N-diethylacetamide | 685-91-6 | 42.4 | 0.36 | | N,N-diethylformamide | 617-84-5 | 41.8 | 0.34 | | N,N-dimethylacetamide | 127-19-5 | 43.7 | 0.40 | | N,N-dimethylaniline | 121-69-7 | 36.5 | 0.18 | | N,N-dimethylcyclohexylamine | 98-94-2 | 37.3 | 0.20 | | N,N-dimethylformamide | 68-12-2 | 43.8 | 0.40 | | N-methylacetamide | 79-16-3 | 52.0 | 0.66 | | N-methylaniline | 100-61-8 | 42.5 | 0.36 | | N-methylcaprolactame | 2556-73-2 | 41.6 | 0.34 | | N-methylformamide | 123-39-7 | 54.1 | 0.72 | | N-methylpyrrolidon | 872-50-4 | 42.2 | 0.35 | | nitrobenzene | 98-95-3 | 41.2 | 0.32 | | nitromethane | 75-52-5 | 46.3 | 0.48 | | octane | 111-65-9 | 31.1 | 0.01 | | octanol | 111-87-5 | 48.3 | 0.54 | | oxane | 142-68-7 | 36.6 | 0.18 | | oxolan-2-one | 96-48-0 | 44.3 | 0.42 | | p-xylene | 106-42-3 | 33.1 | 0.07 | | pentafluoropyridine | 700-16-3 | 36.3 | 0.17 | | pentamethylene sulfide | 1613-51-0 | 35.9 | 0.16 | | pentane | 109-66-0 | 31.1 | 0.01 | | pentanoic acid | 109-52-4 | 55.3 | 0.76 | | pentanol | 71-41-0 | 49.1 | 0.57 | | phenol | 108-95-2 | 53.4 | 0.70 | | piperidine | 110-89-4 | 35.5 | 0.15 | | propanenitrile | 107-12-0 | 43.6 | 0.40 | | propanoic acid | 79-09-4 | 55.0 | 0.75 | | propanol | 71-23-8 | 50.7 | 0.62 | | propyl acetate | 109-60-4 | 37.5 | 0.21 | | pyridine | 110-86-1 | 40.5 | 0.30 | | pyrrolidine | 123-75-1 | 39.1 | 0.26 | | quinoline | 91-22-5 | 39.4 | 0.27 | | sulfolane | 126-33-0 | 44.0 | 0.41 | | tetrachloroethene | 127-18-4 | 31.9 | 0.04 | | tetrachloromethane | 56-23-5 | 32.4 | 0.05 | | tetrahydrofuran | 109-99-9 | 37.4 | 0.21 | | tetramethylsilane | 75-76-3 | 30.7 | 0.00 | | thiolane | 110-01-0 | 36.7 | 0.19 | | thiolane-1-oxide | 1600-44-8 | 43.6 | 0.40 | | toluene | 108-88-3 | 33.9 | 0.10 | | trans-dichloroethene | 156-60-5 | 41.9 | 0.35 | | tribromomethane | 75-25-2 | 37.7 | 0.22 | | tributyl phosphate | 126-73-8 | 39.6 | 0.27 | | tributylamine | 102-82-9 | 32.1 | 0.04 | | trichloroethene | 79-01-6 | 35.9 | 0.16 | | trichloromethane | 67-66-3 | 39.1 | 0.26 | | triethyl phosphate | 78-40-0 | 41.7 | 0.34 | | triethylamine | 121-44-8 | 32.1 | 0.04 | | trimethyl phosphate | 512-56-1 | 43.6 | 0.40 | | vinyl benzene | 100-42-5 | 34.8 | 0.13 | | water | 7732-18-5 | 63.1 | 1.00 |
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