Abstract
The standard free energies of formation of gaseous complexes between monoprotonic oxonium ions and acetonitrile have been obtained by using the ion cyclotron resonance equilibrium constant method for exchange of acetonitrile between the ions. The results show that the "solvation" by a single molecule of acetonitrile in the gas phase reproduces the important diverse effects of molecular structure on oxonium ion solvation by bulk water. It is estimated from the present results that the effects of solvation by bulk water are only about three times as great as the corresponding effects of "solvation" by a single water molecule in the gas phase. Internal charge delocalization from the protonic site of the oxonium ion strongly reduces solvation. Proton transfer between charge-localized and charge-delocalized oxonium ions may be reversed by differential solvation, both with single H-bonding molecules in the gas phase and with bulk solvent. Further evidence for the site of preferred protonation of esters and amides is provided.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 5448-5453 |
| Number of pages | 6 |
| Journal | Journal of the American Chemical Society |
| Volume | 103 |
| Issue number | 18 |
| State | Published - 1981 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Chemistry(all)
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Oxonium ions. Solvatin by single acetonitrile molecules in the gas phase and by bulk solvents. / Bromilow, J.; Abboud, J. L M; Lebrilla, C. B.; Taft, R. W.; Scorrano, G.; Lucchini, V.
In: Journal of the American Chemical Society, Vol. 103, No. 18, 1981, p. 5448-5453.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Oxonium ions. Solvatin by single acetonitrile molecules in the gas phase and by bulk solvents
AU - Bromilow, J.
AU - Abboud, J. L M
AU - Lebrilla, C. B.
AU - Taft, R. W.
AU - Scorrano, G.
AU - Lucchini, V.
PY - 1981
Y1 - 1981
N2 - The standard free energies of formation of gaseous complexes between monoprotonic oxonium ions and acetonitrile have been obtained by using the ion cyclotron resonance equilibrium constant method for exchange of acetonitrile between the ions. The results show that the "solvation" by a single molecule of acetonitrile in the gas phase reproduces the important diverse effects of molecular structure on oxonium ion solvation by bulk water. It is estimated from the present results that the effects of solvation by bulk water are only about three times as great as the corresponding effects of "solvation" by a single water molecule in the gas phase. Internal charge delocalization from the protonic site of the oxonium ion strongly reduces solvation. Proton transfer between charge-localized and charge-delocalized oxonium ions may be reversed by differential solvation, both with single H-bonding molecules in the gas phase and with bulk solvent. Further evidence for the site of preferred protonation of esters and amides is provided.
AB - The standard free energies of formation of gaseous complexes between monoprotonic oxonium ions and acetonitrile have been obtained by using the ion cyclotron resonance equilibrium constant method for exchange of acetonitrile between the ions. The results show that the "solvation" by a single molecule of acetonitrile in the gas phase reproduces the important diverse effects of molecular structure on oxonium ion solvation by bulk water. It is estimated from the present results that the effects of solvation by bulk water are only about three times as great as the corresponding effects of "solvation" by a single water molecule in the gas phase. Internal charge delocalization from the protonic site of the oxonium ion strongly reduces solvation. Proton transfer between charge-localized and charge-delocalized oxonium ions may be reversed by differential solvation, both with single H-bonding molecules in the gas phase and with bulk solvent. Further evidence for the site of preferred protonation of esters and amides is provided.
UR - http://www.scopus.com/inward/record.url?scp=0042693573&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0042693573&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0042693573
VL - 103
SP - 5448
EP - 5453
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 18
ER -