2-Pentyne
- Formula: C5H8
- Molecular weight: 68.1170
- IUPAC Standard InChIKey: NKTDTMONXHODTI-UHFFFAOYSA-N
- CAS Registry Number: 627-21-4
- 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. - Other names: Ethylmethylacetylene; 1-Ethyl-2-methylacetylene; C2H5C≡CCH3; pent-2-yne
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Gas phase thermochemistry data
Go To: Top, Phase change data, Gas phase ion energetics data, Mass spectrum (electron ionization), Gas Chromatography, References, Notes
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:
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ΔfH°gas | 128.9 ± 2.1 | kJ/mol | Ccb | Wagman, Kilpatrick, et al., 1945 | Unpublished work of E. J. Prosen; ALS |
Constant pressure heat capacity of gas
Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
44.15 | 50. | Thermodynamics Research Center, 1997 | p=1 bar.; GT |
57.16 | 100. | ||
67.94 | 150. | ||
77.88 | 200. | ||
93.74 | 273.15 | ||
99.59 | 298.15 | ||
100.03 | 300. | ||
123.79 | 400. | ||
145.57 | 500. | ||
164.39 | 600. | ||
180.55 | 700. | ||
194.50 | 800. | ||
206.58 | 900. | ||
217.06 | 1000. | ||
226.1 | 1100. | ||
234.0 | 1200. | ||
240.8 | 1300. | ||
246.8 | 1400. | ||
251.9 | 1500. |
Phase change data
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), Gas Chromatography, References, Notes
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:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 329.0 ± 0.9 | K | AVG | N/A | Average of 20 out of 21 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 163.7 | K | N/A | Pomerantz, Fookson, et al., 1954 | Uncertainty assigned by TRC = 0.2 K; TRC |
Tfus | 163.82 | K | N/A | Henne and Greenlee, 1945 | Uncertainty assigned by TRC = 0.1 K; TRC |
Tfus | 163.82 | K | N/A | Boord, Perilstein, et al., 1944 | Uncertainty assigned by TRC = 0.5 K; TRC |
Tfus | 172. | K | N/A | Van Risseghem, 1914 | Uncertainty assigned by TRC = 2. K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 30.8 | kJ/mol | N/A | Reid, 1972 | AC |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
33.1 | 255. | A | Stephenson and Malanowski, 1987 | Based on data from 240. to 329. K.; AC |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Phase change data, Mass spectrum (electron ionization), Gas Chromatography, 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
Data compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
View reactions leading to C5H8+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Proton affinity (review) | 810.2 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
Gas basicity | 778.0 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
9.44 ± 0.02 | PE | Bieri, Burger, et al., 1977 | LLK |
9.439 ± 0.005 | PE | Carlier, Dubois, et al., 1975 | LLK |
Mass spectrum (electron ionization)
Go To: Top, Gas phase thermochemistry data, Phase change data, Gas phase ion energetics data, Gas Chromatography, 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 | NIST Mass Spectrometry Data Center, 1990. |
NIST MS number | 114401 |
Gas Chromatography
Go To: Top, Gas phase thermochemistry data, Phase change data, Gas phase ion energetics data, Mass spectrum (electron ionization), 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
Kovats' RI, non-polar column, isothermal
Column type | Active phase | Temperature (C) | I | Reference | Comment |
---|---|---|---|---|---|
Capillary | OV-1 | 27. | 549. | Heberger, 1990 | 25. m/0.25 mm/0.50 μm, He |
Capillary | OV-1 | 30. | 579. | Heberger, 1990 | 25. m/0.25 mm/0.50 μm, He |
Capillary | OV-1 | 75. | 570. | Heberger, 1990 | 25. m/0.25 mm/0.50 μm, He |
Packed | Squalane | 27. | 549. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 49. | 548. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 67. | 548. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 86. | 547. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Van Den Dool and Kratz RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Petrocol DH | 566. | White, Hackett, et al., 1992 | 100. m/0.25 mm/0.5 μm, He, 1. K/min; Tstart: 30. C; Tend: 220. C |
References
Go To: Top, Gas phase thermochemistry data, Phase change data, Gas phase ion energetics data, Mass spectrum (electron ionization), Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Wagman, Kilpatrick, et al., 1945
Wagman, D.D.; Kilpatrick, J.E.; Pitzer, K.S.; Rossini, F.D.,
Heats, equilibrium constants, and free energies of formation of the acetylene hydrocarbons through the pentynes, to 1,500° K,
J. Res. NBS, 1945, 35, 467-496. [all data]
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]
Pomerantz, Fookson, et al., 1954
Pomerantz, P.; Fookson, A.; Mears, T.W.; Rothberg, S.; Howard, F.L.,
Synthesis and Physical Properties of Several Acetylenic Hydrocarbons,
J. Res. Natl. Bur. Stand. (U. S.), 1954, 52, 51. [all data]
Henne and Greenlee, 1945
Henne, A.L.; Greenlee, K.W.,
Preparation and Physical Constants of Acetylenic Compounds,
J. Am. Chem. Soc., 1945, 67, 484-5. [all data]
Boord, Perilstein, et al., 1944
Boord, C.E.; Perilstein, W.L.; Greenlee, K.W.,
, Am. Pet. Inst. Hydrocarbon Res. Proj., Sixth Annu. Ref., Ohio State Univ., Aug. 31, 1944. [all data]
Van Risseghem, 1914
Van Risseghem, H.,
Beta-pentene and some of its derivatives,
C. R. Hebd. Seances Acad. Sci., 1914, 158, 1694-8. [all data]
Reid, 1972
Reid, Robert C.,
Handbook on vapor pressure and heats of vaporization of hydrocarbons and related compounds, R. C. Wilhort and B. J. Zwolinski, Texas A Research Foundation. College Station, Texas(1971). 329 pages.$10.00,
AIChE J., 1972, 18, 6, 1278-1278, https://doi.org/10.1002/aic.690180637
. [all data]
Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw,
Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2
. [all data]
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]
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]
Carlier, Dubois, et al., 1975
Carlier, P.; Dubois, J.E.; Masclet, P.; Mouvier, G.,
Spectres de photoelectrons des alcynes,
J. Electron Spectrosc. Relat. Phenom., 1975, 7, 55. [all data]
Heberger, 1990
Heberger, K.,
Identification of C5H8 Isomers Through Reactions of Singlet Methylene, CH2(ã1A1), with Unsaturated Hydrocarbons Using Capillary Gas Chromatography - Mass Spectrometry,
Analyst, 1990, 115, 6, 725-729, https://doi.org/10.1039/an9901500725
. [all data]
Hively and Hinton, 1968
Hively, R.A.; Hinton, R.E.,
Variation of the retention index with temperature on squalane substrates,
J. Gas Chromatogr., 1968, 6, 4, 203-217, https://doi.org/10.1093/chromsci/6.4.203
. [all data]
White, Hackett, et al., 1992
White, C.M.; Hackett, J.; Anderson, R.R.; Kail, S.; Spock, P.S.,
Linear temperature programmed retention indices of gasoline range hydrocarbons and chlorinated hydrocarbons on cross-linked polydimethylsiloxane,
J. Hi. Res. Chromatogr., 1992, 15, 2, 105-120, https://doi.org/10.1002/jhrc.1240150211
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Phase change data, Gas phase ion energetics data, Mass spectrum (electron ionization), Gas Chromatography, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas Tboil Boiling point Tfus Fusion (melting) point ΔfH°gas Enthalpy of formation of gas at standard conditions ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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