Hexanoic acid, 2-ethyl-
- Formula: C8H16O2
- Molecular weight: 144.2114
- IUPAC Standard InChIKey: OBETXYAYXDNJHR-UHFFFAOYSA-N
- CAS Registry Number: 149-57-5
- 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: α-Ethylcaproic acid; α-Ethylhexanoic acid; Butylethylacetic acid; Ethylhexanoic acid; Ethylhexoic acid; 2-Butylbutanoic acid; 2-Ethylcaproic acid; 2-Ethylhexanoic acid; 2-Ethylhexoic acid; 3-Heptanecarboxylic acid; Kyselina 2-ethylkapronova; Kyselina heptan-3-karboxylova; 2-Ethyl-1-hexanoic acid; 2-Ethylcapronic acid; NSC 8881
- Permanent link for this species. Use this link for bookmarking this species for future reference.
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, NIST Subscription Links, 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: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | -559.5 ± 2.1 | kJ/mol | Ccr | Stridh, 1976 |
Condensed 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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°liquid | -635.1 ± 2.0 | kJ/mol | Ccr | Stridh, 1976 | |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°liquid | -4799.6 ± 1.7 | kJ/mol | Ccr | Stridh, 1976 | Corresponding ΔfHºliquid = -635.14 kJ/mol (simple calculation by NIST; no Washburn corrections) |
Phase change 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:
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
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 501.2 | K | N/A | Aldrich Chemical Company Inc., 1990 | BS |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 675. | K | N/A | Steele, Chirico, et al., 1997 | Uncertainty assigned by TRC = 5. K; derived from fit of obs. vapor pressure; TRC |
Tc | 673.6 | K | N/A | Teja and Anselme, 1990 | Uncertainty assigned by TRC = 1.2 K; TRC |
Tc | 674.6 | K | N/A | Teja and Rosenthal, 1990 | Uncertainty assigned by TRC = 0.8 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 27.80 | bar | N/A | Steele, Chirico, et al., 1997 | Uncertainty assigned by TRC = 3.00 bar; derived from fit of obs. vapor pressure; TRC |
Pc | 27.78 | bar | N/A | Teja and Rosenthal, 1990 | Uncertainty assigned by TRC = 0.40 bar; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 1.803 | mol/l | N/A | Steele, Chirico, et al., 1997 | Uncertainty assigned by TRC = 0.10 mol/l; TRC |
ρc | 1.89 | mol/l | N/A | Teja and Anselme, 1990 | Uncertainty assigned by TRC = 0.04 mol/l; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 76.3 ± 0.9 | kJ/mol | EB | Steele, Chirico, et al., 1997, 2 | Based on data from 397. to 514. K.; AC |
ΔvapH° | 75.60 ± 0.42 | kJ/mol | C | Stridh, 1976 | ALS |
ΔvapH° | 75.6 ± 0.5 | kJ/mol | C | Stridh, 1976 | AC |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
61.8 | 418. | A | Stephenson and Malanowski, 1987 | Based on data from 403. to 500. K.; AC |
IR Spectrum
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Data compiled by: Coblentz Society, Inc.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Mass spectrum (electron ionization)
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, Gas Chromatography, NIST Subscription Links, 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, 1998. |
NIST MS number | 291562 |
Gas Chromatography
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, Mass spectrum (electron ionization), NIST Subscription Links, 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 | DB-1 | 170. | 1085.19 | Kuhn, 2001 | 30. m/0.53 mm/3. μm, He |
Van Den Dool and Kratz RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | HP-5MS | 1116.7 | Zeng, Zhao, et al., 2007 | 30. m/0.25 mm/0.25 μm, He, 4. K/min; Tstart: 80. C; Tend: 300. C |
Capillary | DB-5 | 1123. | Nogueira, Bittrich, et al., 2001 | 30. m/0.25 mm/0.25 μm, H2, 3. K/min; Tstart: 60. C; Tend: 240. C |
Capillary | HP-5 | 1128.0 | Siegmund, Derler, et al., 2001 | 30. m/0.25 mm/0.25 μm, He, 5.3 K/min, 280. C @ 5. min; Tstart: 35. C |
Capillary | DB-5 | 1123. | Moio L., Rillo L., et al., 1996 | 30. m/0.32 mm/1. μm, H2, 3. K/min; Tstart: 40. C; Tend: 220. C |
Packed | SE-30 | 1161. | Peng, Ding, et al., 1988 | He, Supelcoport and Chromosorb, 40. C @ 4. min, 10. K/min, 250. C @ 60. min; Column length: 3.05 m |
Van Den Dool and Kratz RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-5 | 1128. | Triqui and Reineccius, 1995 | 30. m/0.25 mm/1. μm, He; Program: 35C (2min) => 40C/min => 50C (1min) => 6C/min => 250C (10min) |
Van Den Dool and Kratz RI, polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-Wax | 1962.5 | Siegmund, Derler, et al., 2001 | 30. m/0.32 mm/0.5 μm, He, 1.1 K/min, 250. C @ 10. min; Tstart: 35. C |
Capillary | DB-Wax | 1914. | Ollé, Baumes, et al., 1998 | 30. m/0.32 mm/0.5 μm, 40. C @ 3. min, 3. K/min, 245. C @ 20. min |
Capillary | DB-Wax | 1969. | Shimoda, Shigematsu, et al., 1995 | 60. m/0.25 mm/0.25 μm, 2. K/min; Tstart: 50. C; Tend: 230. C |
Capillary | DB-Wax | 1950. | Shiratsuchi, Shimoda, et al., 1994 | 60. m/0.25 mm/0.25 μm, He, 2. K/min, 230. C @ 60. min; Tstart: 50. C |
Van Den Dool and Kratz RI, polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Supelcowax-10 | 1965. | Sing, Smadja, et al., 1992 | 60. m/0.25 mm/0.25 μm, He; Program: 20C(0.5min) => 60C => 4C/min => 250C |
Normal alkane RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | VF-5 MS | 1124. | Leffingwell and Alford, 2011 | 60. m/0.32 mm/0.25 μm, Helium, 2. K/min, 260. C @ 28. min; Tstart: 30. C |
Capillary | VF-5 MS | 1126. | Leffingwell and Alford, 2011 | 60. m/0.32 mm/0.25 μm, Helium, 2. K/min, 260. C @ 28. min; Tstart: 30. C |
Capillary | HP-5 MS | 1140. | Jerkovic and Marijanovic, 2010 | 30. m/0.25 mm/0.25 μm, Helium, 70. C @ 2. min, 3. K/min, 200. C @ 18. min |
Capillary | HP-5 MS | 1122. | Pino, Marquez, et al., 2010 | 30. m/0.32 mm/0.25 μm, Helium, 50. C @ 2. min, 4. K/min, 240. C @ 10. min |
Capillary | HP-5 MS | 1108. | Radulovic, Dordevic, et al., 2010 | 30. m/0.25 mm/0.25 μm, Helium, 5. K/min, 290. C @ 10. min; Tstart: 70. C |
Capillary | HP-5 | 1126. | Saidana, Mahjoub, et al., 2008 | 30. m/0.25 mm/0.25 μm, Nitrogen, 50. C @ 1. min, 5. K/min, 280. C @ 1. min |
Capillary | DB-5 | 1114. | Ozel, Gogus, et al., 2006 | 30. m/0.32 mm/0.25 μm, He, 60. C @ 0.5 min, 5. K/min, 280. C @ 2. min |
Capillary | SPB-5 | 1105. | Sebastian, Viallon-Fernandez, et al., 2003 | 60. m/0.32 mm/1.0 μm, Helium, 3. K/min; Tstart: 30. C; Tend: 230. C |
Capillary | Ultra-2 | 1126. | King, Matthews, et al., 1995 | 50. m/0.32 mm/0.52 μm, He, 40. C @ 3. min, 4. K/min, 250. C @ 30. min |
Capillary | Ultra-2 | 1139. | King, Hamilton, et al., 1993 | 50. m/0.32 mm/0.52 μm, He, 40. C @ 3. min, 4. K/min, 250. C @ 30. min |
Capillary | DB-5 | 1123. | Moio, Dekimpe, et al., 1993 | 30. m/0.32 mm/1. μm, H2, 3. K/min; Tstart: 40. C; Tend: 220. C |
Normal alkane RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Polydimethyl siloxane with 5 % Ph groups | 1128. | Robinson, Adams, et al., 2012 | Program: not specified |
Capillary | Polydimethyl siloxane with 5 % Ph groups | 1130. | Robinson, Adams, et al., 2012 | Program: not specified |
Capillary | Siloxane, 5 % Ph | 1104. | VOC BinBase, 2012 | Program: not specified |
Capillary | Polydimethyl siloxane, 5 % phenyl | 1104. | Skogerson, Wohlgemuth, et al., 2011 | Program: not specified |
Capillary | HP-5 MS | 1122. | Pino, Marquez, et al., 2010 | 30. m/0.32 mm/0.25 μm, Helium; Program: not specified |
Capillary | DB-1 | 1097. | Delort and Jaquier, 2009 | 60. m/0.25 mm/0.25 μm, Helium; Program: 50 0C (5 min) 3 0C/min -> 120 0C 5 0C/min -> 250 0C (3 min) 15 0C/min -> 300 0C (20 min) |
Capillary | HP-5 | 1128. | Zhao, Li, et al., 2008 | 30. m/0.25 mm/0.25 μm; Program: 40 0C (2 min) 5 0C/min -> 80 0C 7 oC/min -> 160 0C 9 0C/min -> 200 0C 20 0C/min -> 280 0C (10 min) |
Capillary | SE-54 | 1126. | Um, Bailey, et al., 1992 | He; Column length: 50. m; Column diameter: 0.32 mm; Program: 35 0C (5 min) 8 0C/min -> 200 0C 2 0C/min -> 250 0C |
Capillary | OV-1 | 1117. | Waggott and Davies, 1984 | Hydrogen; Column length: 50. m; Column diameter: 0.32 mm; Program: not specified |
Normal alkane RI, polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | HP-FFAP | 1965. | Wanakhachornkrai and Lertsiri, 9999 | 25. m/0.32 mm/0.50 μm, Helium, 15. K/min; Tstart: 45. C; Tend: 220. C |
Capillary | HP-FFAP | 1968. | Wanakhachornkrai and Lertsiri, 9999 | 25. m/0.32 mm/0.50 μm, Helium, 15. K/min; Tstart: 45. C; Tend: 220. C |
Capillary | HP-FFAP | 1968. | Wanakhachornkrai and Lertsiri, 9999 | 25. m/0.32 mm/0.50 μm, Helium, 15. K/min; Tstart: 45. C; Tend: 220. C |
Capillary | CP Wax 52 CB | 1910. | Chen, Chyau, et al., 2007 | 60. m/0.25 mm/0.25 μm, Helium, 3. K/min; Tstart: 40. C; Tend: 220. C |
Capillary | RTX-Wax | 1934. | Prososki, Etzel, et al., 2007 | 30. m/0.25 mm/0.5 μm, He, 40. C @ 5. min, 10. K/min, 220. C @ 10. min |
Capillary | DB-Wax Etr | 1960. | Ibarz, Ferreira, et al., 2006 | 60. m/0.25 mm/0.25 μm, He, 40. C @ 5. min, 2. K/min, 230. C @ 100. min |
Capillary | HP-FFAP | 1968. | Wanakhachornkrai and Lertsiri, 2003 | 25. m/0.32 mm/0.5 μm, He, 15. K/min; Tstart: 45. C; Tend: 220. C |
Capillary | HP-FFAP | 1968. | Wanakhachornkrai and Lertsiri, 2003 | 25. m/0.32 mm/0.5 μm, He, 15. K/min; Tstart: 45. C; Tend: 220. C |
Capillary | HP-FFAP | 1965. | Wanakhachornkrai and Lertsiri, 2003 | 25. m/0.32 mm/0.5 μm, He, 15. K/min; Tstart: 45. C; Tend: 220. C |
Capillary | TC-Wax | 1937. | Suhardi, Suzuki, et al., 2002 | 60. m/0.25 mm/0.25 μm, He, 40. C @ 10. min, 3. K/min, 230. C @ 10. min |
Capillary | DB-Wax | 1933. | Iwatsuki, Mizota, et al., 1999 | 4. K/min; Column length: 30. m; Column diameter: 0.53 mm; Tstart: 60. C; Tend: 210. C |
Capillary | DB-Wax | 1928. | Iwatsuki, Mizota, et al., 1999 | 4. K/min; Column length: 30. m; Column diameter: 0.53 mm; Tstart: 60. C; Tend: 210. C |
Capillary | DB-Wax | 1954. | Sekiwa, Kubota, et al., 1997 | He, 2. K/min; Column length: 60. m; Column diameter: 0.25 mm; Tstart: 60. C; Tend: 180. C |
Capillary | TC-Wax | 1918. | Shuichi, Masazumi, et al., 1996 | 80. C @ 5. min, 3. K/min; Column length: 60. m; Column diameter: 0.25 mm; Tend: 240. C |
Normal alkane RI, polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-Wax | 1969. | Welke, Manfroi, et al., 2012 | 30. m/0.25 mm/0.25 μm, Helium; Program: not specified |
Capillary | DB-Wax | 1974. | Welke, Manfroi, et al., 2012 | 30. m/0.25 mm/0.25 μm, Helium; Program: not specified |
Capillary | DB-Wax Etr | 1960. | Loskos, Hernandez-Orte, et al., 2007 | 60. m/0.25 mm/0.5 μm, He; Program: 40C(3min) => 10C/min => 90C => 2C/min => 230C (37min) |
Capillary | BP-20 | 1946. | Pontes, Marques, et al., 2007 | 30. m/0.25 mm/0.25 μm, He; Program: 50C(1min) => 2.5C/min => 100C => 2C/min => 180C => 15C/min => 220C |
Capillary | BP-20 | 1967. | Pontes, Marques, et al., 2007 | 30. m/0.25 mm/0.25 μm, He; Program: 50C(1min) => 2.5C/min => 100C => 2C/min => 180C => 15C/min => 220C |
Lee's RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-5MS | 180.8 | Aracil, Font, et al., 2005 | Column length: 60. m; Column diameter: 0.25 mm; Program: not specified |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, NIST Subscription Links, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Stridh, 1976
Stridh, G.,
Enthalpy of formation of 2-ethylhexanoic acid,
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Aldrich Chemical Company Inc., 1990
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Steele, W.V.; Chirico, R.D.; Knipmeyer, S.E.; Nguyen, A.,
Vapor Pressure, Heat Capacity, and Density along the Saturted Line, Measurements for Cyclohexanol, 2-Cyclohexen-1-one, 1,2-Dichloropropane, 1,4-Di-tert-butylbenzene, (±)-2-Ethylhexanoic Acid, 1-(m,
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Teja and Anselme, 1990
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Teja and Rosenthal, 1990
Teja, A.S.; Rosenthal, D.J.,
The Critical Pressures and Temperatures of Twelve Substances Using A Low Residence Time Flow Apparatus,
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Notes
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- Symbols used in this document:
Pc Critical pressure Tboil Boiling point Tc Critical temperature ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions ρc Critical density - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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