Species with data from:

Meot-Ner (Mautner), M.; Sieck, L.W., Proton affinity ladders from variable-temperature equilibrium measurements. 1. A reevaluation of the upper proton affinity range, J. Am. Chem. Soc., 1991, 113, 12, 4448, https://doi.org/10.1021/ja00012a012 .

16 matching species were found.

For each matching species the following will be displayed:

• Chemical name
• Chemical formula
• Structure image (if available)

Click on the name to see more data.

1. Acetophenone (C₈H₈O)
   
2. Acetone (C₃H₆O)
   
3. Dimethyl sulfide (C₂H₆S)
   
4. 1-Propene, 2-methyl- (C₄H₈)
   
5. Dimethyl ether (C₂H₆O)
   
6. 2-Propenenitrile (C₃H₃N)
   
7. Hydrogen sulfide (H₂S)
   
8. Ammonia (H₃N)
   
9. Hydrogen cyanide (CHN)
   
10. NH4+ (H₄N⁺)
    
11. Propenaldimine-1-yl, positive ion (C₃H₄N⁺)
12. tert-Butyl, positive ion (C₄H₉⁺)
13. Isopropyl, positive ion (C₃H₇⁺)
14. Dimethyl ether, protonated (C₂H₇O⁺)
15. Acetophenone, protonated (C₈H₉O)
16. Acetone, protonated (C₃H₇O⁺)

© 2026 by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.

Copyright for NIST Standard Reference Data is governed by the Standard Reference Data Act.