Proton affinity (data page)

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Proton affinities are quoted in kJ/mol, in increasing order of gas-phase basicity of the base.

Base Proton affinity
(kJ/mol)
Neutral molecules
Helium 178
Neon 201
Argon 371
Dioxygen 422
Dihydrogen 424
Krypton 425
Hydrogen fluoride 490
Dinitrogen 495
Xenon 496
Nitric oxide 531
Carbon dioxide 548
Methane 552
Hydrogen chloride 564
Hydrogen bromide 569
Nitrous oxide 571
Carbon monoxide 594
Ethane 601
Nitrogen trifluoride 602
Hydrogen iodide 628
Carbonyl sulfide 632
Acetylene 641
Arsenic trifluoride 649
Silane 649
Sulfur dioxide 676
Hydrogen peroxide 678
Ethylene 680
Phosphorus trifluoride 697
Water 697
Carbon disulfide 699
Phosphoryl trifluoride 702
2,4-Dicarba-closo-heptaborane(7) 703
Hydrogen sulfide 712
Hydrogen selenide 717
Hydrogen cyanide 717
Formaldehyde 718
Carbon monosulfide 732
Cyanogen chloride 735
Arsine 750
Benzene 759
Methanol 761
Methanethiol 784
Ethanol 788
Acetonitrile 788
Phosphine 789
Nitrogen trichloride 791
Ethanethiol 798
Propanol 798
Propane-1-thiol 802
Hydroxylamine 803
Dimethyl ether 804
Glyceryl phosphite 812
Borazine 812
Acetone 823
Diethyl ether 838
Dimethyl sulfide 839
Iron pentacarbonyl 845
Ammonia 854
Methylphosphine 854
Hydrazine 856
Diethyl sulfide 858
1,6-Dicarba-closo-hexaborane(6) 866
Aniline 877
P(OCH2)3CCH3 877
Ferrocene 877
Dimethyl sulfoxide 884
Dimethyl formamide 884
Trimethyl phosphate 887
Trimethylarsine 893
Methylamine 896
Tri-O-methyl thiophosphate 897
Dimethylphosphine 905
Trimethyl phosphite 923
Dimethylamine 923
Pyridine 924
Trimethylamine 942
Trimethylphosphine 950
Triethylphosphine 969
Triethylamine 972
Lithium hydroxide 1008
Sodium hydroxide 1038
Potassium hydroxide 1100
Caesium hydroxide 1125
Anions
Trioxophosphate(1−) 1301
Iodide 1315
Pentacarbonylmanganate(1−) 1326
Trifluoroacetate 1350
Bromide 1354
Nitrate 1358
Pentacarbonylrhenate(1−) 1389
Chloride 1395
Nitrite 1415
Hydroselenide 1417
Formate 1444
Acetate 1458
Phenoxide 1470
Cyanide 1477
Hydrosulfide 1477
Cyclopentadienide 1490
Ethanethiolate 1495
Nitromethanide 1501
Arsinide 1502
Methanethiolate 1502
Germanide 1509
Trichloromethanide 1515
Formylmethanide 1533
Methylsulfonylmethanide 1534
Anilide 1536
Acetonide 1543
Phosphinide 1550
Silanide 1554
Fluoride 1554
Cyanomethanide 1557
Propoxide 1568
Acetylide 1571
Trifluoromethanide 1572
Ethoxide 1574
Phenylmethanide 1586
Methoxide 1587
Hydroxide 1635
Amide 1672
Hydride 1675
Methanide 1743

Source: Jolly, William L. (1991). Modern Inorganic Chemistry (2nd Edn.). New York: McGraw-Hill. ISBN 0-07-112651-1.