Home Symbol which looks like a small house Up Solid circle with an upward pointer in it

Isopropyl Alcohol

Data at NIST subscription sites:

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.

Gas phase ion energetics data

Go To: Top, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
MM - Michael M. Meot-Ner (Mautner)
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to C3H8O+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)10.17 ± 0.02eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)793.0kJ/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity762.6kJ/molN/AHunter and Lias, 1998HL

Proton affinity at 298K

Proton affinity (kJ/mol) Reference Comment
796. ± 6.Cao and Holmes, 2001MM

Ionization energy determinations

IE (eV) Method Reference Comment
10.15 ± 0.07EIBowen and Maccoll, 1984LBLHLM
10.10 ± 0.02PIPotapov and Sorokin, 1972LLK
10.29 ± 0.02PECocksey, Eland, et al., 1971LLK
10.18PEDewar and Worley, 1969RDSH
10.12 ± 0.03PIRefaey and Chupka, 1968RDSH
10.15 ± 0.05PIWatanabe, 1957RDSH
10.44PEBenoit and Harrison, 1977Vertical value; LLK
10.49 ± 0.03PEPeel and Willett, 1975Vertical value; LLK
10.42PERobin and Kuebler, 1973Vertical value; LLK
10.36PEKatsumata, Iwai, et al., 1973Vertical value; LLK
10.42PEBaker, Betteridge, et al., 1971Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
CH3+30.2 ± 0.2?EIOlmsted, Street, et al., 1964RDSH
CH3O+12.5?EIFriedman, Long, et al., 1957RDSH
C2H3+14.6?EIFriedman, Long, et al., 1957RDSH
C2H4O+10.27 ± 0.09CH4EIBowen and Maccoll, 1984LBLHLM
C2H4O+10.26CH4EIHolmes, Burgers, et al., 1982LBLHLM
C2H4O+10.23 ± 0.02CH4PIPotapov and Sorokin, 1972LLK
C2H4O+10.27 ± 0.03CH4PIRefaey and Chupka, 1968RDSH
C2H5O+10.20 ± 0.08CH3EIBowen and Maccoll, 1984LBLHLM
C2H5O+10.26CH3EILossing, 1977LLK
C2H5O+10.40 ± 0.03CH3PIPotapov and Sorokin, 1972LLK
C2H5O+10.70CH3EIHaney and Franklin, 1969RDSH
C2H5O+10.40CH3PIRefaey and Chupka, 1968RDSH
C3H6+~12.0 ± 0.9H2OEIBowen and Maccoll, 1984LBLHLM
C3H6+~12.0H2OPIRefaey and Chupka, 1968RDSH
C3H7+11.6OHPIRefaey and Chupka, 1968RDSH
C3H7O+<=10.48 ± 0.08HEIBowen and Maccoll, 1984LBLHLM
C3H7O+<=10.48HEILossing, 1977LLK
C3H7O+10.3 ± 0.5HPIPotapov and Sorokin, 1972LLK
C3H7O+10.6HPIRefaey and Chupka, 1968RDSH
C3H7O+11.85HEILambdin, Tuffly, et al., 1959RDSH

De-protonation reactions

C3H7O- + Hydrogen cation = Isopropyl Alcohol

By formula: C3H7O- + H+ = C3H8O

Quantity Value Units Method Reference Comment
Deltar1569. ± 4.2kJ/molD-EARamond, Davico, et al., 2000gas phase; B
Deltar1571. ± 8.8kJ/molG+TSBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Deltar1576. ± 4.2kJ/molCIDTDeTuri and Ervin, 1999gas phase; B
Deltar1572. ± 8.4kJ/molCIDCHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.; B
Quantity Value Units Method Reference Comment
Deltar1542. ± 4.6kJ/molH-TSRamond, Davico, et al., 2000gas phase; B
Deltar1543. ± 8.4kJ/molIMREBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Deltar1544. ± 8.8kJ/molH-TSHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.; B


Go To: Top, Gas phase ion energetics data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Cao and Holmes, 2001
Cao, J.; Holmes, J.L., Determination of the proton affinities of secondary alcohols from the dissocation of proton-bound molecular trios, European J. Mass Spectrom., 2001, 7, 243-247. [all data]

Bowen and Maccoll, 1984
Bowen, R.D.; Maccoll, A., Low energy, low temperature mass spectra, Org. Mass Spectrom., 1984, 19, 379. [all data]

Potapov and Sorokin, 1972
Potapov, V.K.; Sorokin, V.V., Kinetic energies of products of dissociative photoionization of molecules. I. Aliphatic ketones and alcohols, Khim. Vys. Energ., 1972, 6, 387. [all data]

Cocksey, Eland, et al., 1971
Cocksey, B.J.; Eland, J.H.D.; Danby, C.J., The effect of alkyl substitution on ionisation potential, J. Chem. Soc., 1971, (B), 790. [all data]

Dewar and Worley, 1969
Dewar, M.J.S.; Worley, S.D., Photoelectron spectra of molecules. I. Ionization potentials of some organic molecules and their interpretation, J. Chem. Phys., 1969, 50, 654. [all data]

Refaey and Chupka, 1968
Refaey, K.M.A.; Chupka, W.A., Photoionization of the lower aliphatic alcohols with mass analysis, J. Chem. Phys., 1968, 48, 5205. [all data]

Watanabe, 1957
Watanabe, K., Ionization potentials of some molecules, J. Chem. Phys., 1957, 26, 542. [all data]

Benoit and Harrison, 1977
Benoit, F.M.; Harrison, A.G., Predictive value of proton affinity. Ionization energy correlations involving oxygenated molecules, J. Am. Chem. Soc., 1977, 99, 3980. [all data]

Peel and Willett, 1975
Peel, J.B.; Willett, G.D., Photoelectron spectroscopic studies of the higher alcohols, Aust. J. Chem., 1975, 28, 2357. [all data]

Robin and Kuebler, 1973
Robin, M.B.; Kuebler, N.A., Excited electronic states of the simple alcohols, J. Electron Spectrosc. Relat. Phenom., 1973, 1, 13. [all data]

Katsumata, Iwai, et al., 1973
Katsumata, S.; Iwai, T.; Kimura, K., Photoelectron spectra and sum rule consideration. Higher alkyl amines and alcohols, Bull. Chem. Soc. Jpn., 1973, 46, 3391. [all data]

Baker, Betteridge, et al., 1971
Baker, A.D.; Betteridge, D.; Kemp, N.R.; Kirby, R.E., Application of photoelectron spectrometry to pesticide analysis. II.Photoelectron spectra of hydroxy-, and halo-alkanes and halohydrins, Anal. Chem., 1971, 43, 375. [all data]

Olmsted, Street, et al., 1964
Olmsted, J., III; Street, K., Jr.; Newton, A.S., Excess-kinetic-energy ions in organic mass spectra, J. Chem. Phys., 1964, 40, 2114. [all data]

Friedman, Long, et al., 1957
Friedman, L.; Long, F.A.; Wolfsberg, M., Study of the mass spectra of the lower aliphatic alcohols, J. Chem. Phys., 1957, 27, 613. [all data]

Holmes, Burgers, et al., 1982
Holmes, J.L.; Burgers, P.C.; Mollah, Y.A., Alkane elimination from ionized alkanols, Org. Mass Spectrom., 1982, 17, 127. [all data]

Lossing, 1977
Lossing, F.P., Heats of formation of some isomeric [CnH2n+1]+ ions. Substitutional effects on ion stability, J. Am. Chem. Soc., 1977, 99, 7526. [all data]

Haney and Franklin, 1969
Haney, M.A.; Franklin, J.L., Excess energies in mass spectra of some oxygen-containing organic compounds, J. Chem. Soc. Faraday Trans., 1969, 65, 1794. [all data]

Lambdin, Tuffly, et al., 1959
Lambdin, W.J.; Tuffly, B.L.; Yarborough, V.A., Appearance potentials as obtained with an analytical mass spectrometer, Appl. Spectry., 1959, 13, 71. [all data]

Ramond, Davico, et al., 2000
Ramond, T.M.; Davico, G.E.; Schwartz, R.L.; Lineberger, W.C., Vibronic structure of alkoxy radicals via photoelectron spectroscopy, J. Chem. Phys., 2000, 112, 3, 1158-1169, https://doi.org/10.1063/1.480767 . [all data]

Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr., The gas phase acidity scale from methanol to phenol, J. Am. Chem. Soc., 1979, 101, 6047. [all data]

DeTuri and Ervin, 1999
DeTuri, V.F.; Ervin, K.M., Competitive threshold collision-induced dissociation: Gas-phase acidities and bond dissociation energies for a series of alcohols, J. Phys. Chem. A, 1999, 103, 35, 6911-6920, https://doi.org/10.1021/jp991459m . [all data]

Haas and Harrison, 1993
Haas, M.J.; Harrison, A.G., The Fragmentation of Proton-Bound Cluster Ions and the Gas-Phase Acidities of Alcohols, Int. J. Mass Spectrom. Ion Proc., 1993, 124, 2, 115, https://doi.org/10.1016/0168-1176(93)80003-W . [all data]


Go To: Top, Gas phase ion energetics data, References