2-Pentene, (Z)-
- Formula: C5H10
- Molecular weight: 70.1329
- IUPAC Standard InChIKey: QMMOXUPEWRXHJS-HYXAFXHYSA-N
- CAS Registry Number: 627-20-3
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Stereoisomers:
- Other names: (Z)-2-Pentene; cis-β-Amylene; cis-Pentene; cis-2-Pentene; 2-(Z)-C5H10; cis-Pentene-2; Pentene-2, cis-; (Z)-pent-2-ene
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Gas phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
DRB - Donald R. Burgess, Jr.
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | -28. ± 4. | kJ/mol | AVG | N/A | Average of 7 values; Individual data points |
Constant pressure heat capacity of gas
Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
98.8 | 298.15 | Thermodynamics Research Center, 1997 | p=1 bar. Recommended values were calculated from data for lower alkenes by a method of increments. These values are in good agreement with experimental data (see also [ Kilpatrick J.E., 1946]).; GT |
99.3 | 300. | ||
128.3 | 400. | ||
155.6 | 500. | ||
179.4 | 600. | ||
199.2 | 700. | ||
216.5 | 800. | ||
231.4 | 900. | ||
244.3 | 1000. | ||
255.3 | 1100. | ||
265.0 | 1200. | ||
273.3 | 1300. | ||
280.6 | 1400. | ||
286.90 | 1500. |
Reaction thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
By formula: C5H10 = C5H10
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -4.90 ± 0.08 | kJ/mol | Eqk | Kapteijn, Steen, et al., 1983 | gas phase; Between 250-823 K |
ΔrH° | -4. ± 0.63 | kJ/mol | Eqk | Egger and Benson, 1966 | gas phase; Heat of isomerization |
By formula: H2 + C5H10 = C5H12
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -117.7 ± 0.8 | kJ/mol | Chyd | Egger and Benson, 1966 | gas phase |
By formula: C5H11Cl = C5H10 + HCl
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 65.3 | kJ/mol | Eqk | Karaseva and Andreevskii, 1969 | gas phase |
Gas phase ion energetics data
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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:
L - Sharon G. Lias
Data compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
View reactions leading to C5H10+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 9.01 ± 0.03 | eV | N/A | N/A | L |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
8.94 ± 0.02 | PE | Ashmore and Burgess, 1978 | LLK |
9.04 ± 0.02 | PE | Bieri, Burger, et al., 1977 | LLK |
9.036 ± 0.005 | PE | Masclet, Grosjean, et al., 1973 | LLK |
9.23 ± 0.02 | EI | Gross and Wilkins, 1971 | LLK |
9.11 | EI | Collin and Lossing, 1959 | RDSH |
9.22 ± 0.01 | PE | Krause, Taylor, et al., 1978 | Vertical value; LLK |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
C3H6+ | 11.54 ± 0.02 | C2H4 | EI | Gross and Wilkins, 1971 | LLK |
C4H7+ | 9.02 | CH3 | PI | Traeger, 1986 | LBLHLM |
C4H7+ | 10.62 | CH3 | PI | Traeger, 1986 | LBLHLM |
C4H7+ | 11.24 ± 0.02 | CH3 | EI | Gross and Wilkins, 1971 | LLK |
IR Spectrum
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Gas Phase Spectrum
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Additional Data
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Owner | NIST Standard Reference Data Program Collection (C) 2018 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
Origin | NIST Mass Spectrometry Data Center |
State | gas |
Instrument | HP-GC/MS/IRD |
Mass spectrum (electron ionization)
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
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Additional Data
View image of digitized spectrum (can be printed in landscape orientation).
Due to licensing restrictions, this spectrum cannot be downloaded.
Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
Origin | Japan AIST/NIMC Database- Spectrum MS-NW-3263 |
NIST MS number | 230823 |
References
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Thermodynamics Research Center, 1997
Thermodynamics Research Center,
Selected Values of Properties of Chemical Compounds., Thermodynamics Research Center, Texas A&M University, College Station, Texas, 1997. [all data]
Kilpatrick J.E., 1946
Kilpatrick J.E.,
Heats, equilibrium constants, and free energies of formation of the monoolefin hydrocarbons,
J. Res. Nat. Bur. Stand, 1946, 36, 559-612. [all data]
Kapteijn, Steen, et al., 1983
Kapteijn, F.; Steen, A.J.; Mol, J.C.,
Thermodynamics of the geometrical isomerization of 2-butene and 2-pentene,
J. Chem. Thermodyn., 1983, 15, 137-146. [all data]
Egger and Benson, 1966
Egger, K.W.; Benson, S.W.,
Nitric oxide and iodine catalyzed isomerization of olefins. VI. Thermodynamic data from equilibrium studies of the geometrical and positional isomerization of n-pentenes,
J. Am. Chem. Soc., 1966, 88, 236-240. [all data]
Karaseva and Andreevskii, 1969
Karaseva, S.Ya.; Andreevskii, D.N.,
Equilibrium in the isomerisation of secondary monochloropentanes and the dehydrochlorination of 2-chloropentane,
Russ. J. Phys. Chem. (Engl. Transl.), 1969, 43, 1236-1238. [all data]
Ashmore and Burgess, 1978
Ashmore, F.S.; Burgess, A.R.,
Photoelectron spectra of the unbranched C5-C7 alkenes, aldehydes and ketones,
J. Chem. Soc. Faraday Trans. 2, 1978, 74, 734. [all data]
Bieri, Burger, et al., 1977
Bieri, G.; Burger, F.; Heilbronner, E.; Maier, J.P.,
Valence ionization enrgies of hydrocarbons,
Helv. Chim. Acta, 1977, 60, 2213. [all data]
Masclet, Grosjean, et al., 1973
Masclet, P.; Grosjean, D.; Mouvier, G.,
Alkene ionization potentials. Part I. Quantitative determination of alkyl group structural effects,
J. Electron Spectrosc. Relat. Phenom., 1973, 2, 225. [all data]
Gross and Wilkins, 1971
Gross, M.L.; Wilkins, C.L.,
Computer-assisted ion cyclotron resonance appearance potential measurements for C5H10 isomers,
Anal. Chem., 1971, 43, 1624. [all data]
Collin and Lossing, 1959
Collin, J.; Lossing, F.P.,
Ionization potentials of some olefins, di-olefins and branched paraffins,
J. Am. Chem. Soc., 1959, 81, 2064. [all data]
Krause, Taylor, et al., 1978
Krause, D.A.; Taylor, J.W.; Fenske, R.F.,
An analysis of the effects of alkyl substituents on the ionization potentials of n-alkenes,
J. Am. Chem. Soc., 1978, 100, 718. [all data]
Traeger, 1986
Traeger, J.C.,
Heat of formation for the 1-methylallyl cation by photoionization mass spectrometry,
J. Phys. Chem., 1986, 90, 4114. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), References
- Symbols used in this document:
AE Appearance energy Cp,gas Constant pressure heat capacity of gas IE (evaluated) Recommended ionization energy ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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