Pyridine, 3,4-dimethyl-

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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 by: Donald R. Burgess, Jr.

Quantity Value Units Method Reference Comment
Δfgas16.7kcal/molN/ACox and Gundry, 1958Value computed using ΔfHliquid° value of 18.2 kj/mol from Cox and Gundry, 1958 and ΔvapH° value of 51.8 kj/mol from missing citation.

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:
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 C7H9N+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
Proton affinity (review)228.8kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity221.2kcal/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV) Method Reference Comment
9.3PEAue and Bowers, 1979Vertical value; LLK
9.15PERamsey and Walker, 1974Vertical value; LLK

Gas Chromatography

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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

Kovats' RI, non-polar column, isothermal

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Column type Active phase Temperature (C) I Reference Comment
PackedC78, Branched paraffin130.986.2Dallos, Sisak, et al., 2000He; Column length: 3.3 m
PackedC78, Branched paraffin130.982.8Reddy, Dutoit, et al., 1992Chromosorb G HP; Column length: 3.3 m
PackedApolane130.988.Dutoit, 1991Column length: 3.7 m
CapillarySE-30110.992.Samusenko and Golovnya, 198825. m/0.32 mm/1. μm, He
CapillarySE-3080.982.Samusenko and Golovnya, 198825. m/0.32 mm/1. μm, He
CapillaryOV-101150.1000.Morishita, Morimoto, et al., 1986N2; Column length: 20. m; Column diameter: 0.23 mm
PackedApiezon L130.1018.Shatts, Avots, et al., 1977He, Chromosorb W AW-DMCS; Column length: 2.4 m

Kovats' RI, polar column, isothermal

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Column type Active phase Temperature (C) I Reference Comment
CapillaryPEG-40M110.1469.Golovnya, Samusenko, et al., 1987He; Column length: 50. m; Column diameter: 0.3 mm
CapillaryPEG-40M80.1441.Golovnya, Samusenko, et al., 1987He; Column length: 50. m; Column diameter: 0.3 mm

Van Den Dool and Kratz RI, non-polar column, temperature ramp

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Column type Active phase I Reference Comment
CapillaryDB-Petro1001.3Lu, Zhao, et al., 200450. m/0.2 mm/0.5 μm, 2. K/min; Tstart: 50. C; Tend: 220. C
CapillaryOV-101989.Golovnya, Samusenko, et al., 1988He, 2. K/min; Column length: 50. m; Column diameter: 0.25 mm; Tstart: 100. C
CapillaryOV-101988.Golovnya, Samusenko, et al., 1988He, 8. K/min; Column length: 50. m; Column diameter: 0.25 mm; Tstart: 70. C
CapillaryOV-101988.Golovnya, Samusenko, et al., 1988He, 4. K/min; Column length: 50. m; Column diameter: 0.25 mm; Tstart: 80. C
CapillaryDB-51003.Premecz and Ford, 1987He, 60. C @ 10. min, 10. K/min, 280. C @ 3. min; Column length: 30. m; Column diameter: 0.32 mm
CapillaryDB-5999.Rostad and Pereira, 198630. m/0.26 mm/0.25 μm, He, 50. C @ 4. min, 6. K/min, 300. C @ 20. min

Van Den Dool and Kratz RI, polar column, temperature ramp

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Column type Active phase I Reference Comment
CapillaryDB-Wax1455.Kim, 200160. m/0.25 mm/0.25 μm, He, 40. C @ 5. min, 2. K/min, 200. C @ 30. min
CapillaryPEG-40M1473.Golovnya, Samusenko, et al., 198825. m/0.32 mm/0.80 μm, He, 2. K/min; Tstart: 100. C
CapillaryPEG-40M1483.Golovnya, Samusenko, et al., 198825. m/0.32 mm/0.80 μm, He, 8. K/min; Tstart: 70. C
CapillaryPEG-40M1470.Golovnya, Samusenko, et al., 198825. m/0.32 mm/0.80 μm, He, 4. K/min; Tstart: 80. C
CapillaryCAM1444.Premecz and Ford, 1987He, 60. C @ 5. min, 5. K/min, 240. C @ 21. min; Column length: 15. m; Column diameter: 0.24 mm

Normal alkane RI, non-polar column, temperature ramp

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Column type Active phase I Reference Comment
CapillaryHP-5999.Kubec, Drhová, et al., 199930. m/0.25 mm/0.25 μm, N2, 40. C @ 3. min, 4. K/min, 240. C @ 10. min

Normal alkane RI, non-polar column, custom temperature program

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Column type Active phase I Reference Comment
CapillarySE-301040.Li, Gao, et al., 2000Program: not specified

Normal alkane RI, polar column, custom temperature program

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Column type Active phase I Reference Comment
CapillaryCarbowax1466.Baltes and Bochmann, 1987Program: not specified
CapillaryCarbowax1468.Baltes and Bochmann, 1987Program: not specified
CapillaryCarbowax1468.Baltes and Bochmann, 1987Program: not specified
CapillaryCarbowax1469.Baltes and Bochmann, 1987Program: not specified
CapillaryCarbowax1471.Baltes and Bochmann, 1987Program: not specified

Lee's RI, non-polar column, temperature ramp

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Column type Active phase I Reference Comment
CapillaryDB-5161.12Rostad and Pereira, 198630. m/0.26 mm/0.25 μm, He, 50. C @ 4. min, 6. K/min, 300. C @ 20. min

References

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

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

Cox and Gundry, 1958
Cox, J.D.; Gundry, H.A., Heats of combustion. Part II. The six lutidines, J. Chem. Soc., 1958, 1019-1022. [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]

Aue and Bowers, 1979
Aue, D.H.; Bowers, M.T., Chapter 9. Stabilities of positive ions from equilibrium gas phase basicity measurements in Ions Chemistry,, ed. M.T. Bowers, 1979. [all data]

Ramsey and Walker, 1974
Ramsey, B.G.; Walker, F.A., A linear relationship between substituted pyridine lone pair vertical ionization potentials and pKa, J. Am. Chem. Soc., 1974, 96, 3314. [all data]

Dallos, Sisak, et al., 2000
Dallos, A.; Sisak, A.; Kulcsár, Z.; Kováts, E., Pair-wise interactions by gas chromatography VII. Interaction free enthalpies of solutes with secondary alcohol groups, J. Chromatogr. A, 2000, 904, 2, 211-242, https://doi.org/10.1016/S0021-9673(00)00908-0 . [all data]

Reddy, Dutoit, et al., 1992
Reddy, K.S.; Dutoit, J.-Cl.; Kovats, E. sz., Pair-wise interactions by gas chromatography. I. Interaction free enthalpies of solutes with non-associated primary alcohol groups, J. Chromatogr., 1992, 609, 1-2, 229-259, https://doi.org/10.1016/0021-9673(92)80167-S . [all data]

Dutoit, 1991
Dutoit, J., Gas chromatographic retention behaviour of some solutes on structurally similar polar and non-polar stationary phases, J. Chromatogr., 1991, 555, 1-2, 191-204, https://doi.org/10.1016/S0021-9673(01)87179-X . [all data]

Samusenko and Golovnya, 1988
Samusenko, A.L.; Golovnya, R.V., Prediction of the retention indices of methyl pyridines and pyrazines in capillary gas chromatography based on the non-linear additivity of the sorption energy, Chromatographia, 1988, 25, 6, 531-535, https://doi.org/10.1007/BF02324828 . [all data]

Morishita, Morimoto, et al., 1986
Morishita, F.; Morimoto, S.; Kojima, T., Prediction of molecular structures of aza-arenes by retention indices and fluorescence spectra, J. Hi. Res. Chromatogr. Chromatogr. Comm., 1986, 9, 11, 688-692, https://doi.org/10.1002/jhrc.1240091120 . [all data]

Shatts, Avots, et al., 1977
Shatts, V.D.; Avots, A.A.; Belikov, V.A., Retention indices of alkylpyridines, Zh. Anal. Khim., 1977, 32, 4, 631-638. [all data]

Golovnya, Samusenko, et al., 1987
Golovnya, R.V.; Samusenko, A.L.; Dmitriev, L.B., Predicting retention indices of methyl-substituted pyridines in gas capillary chromatogrpahy on the basis of the principle of the nonadditive change in the energy of sorption, Izv. Akad. Nauk SSSR Ser. Khim., 1987, 10, 2234-2239. [all data]

Lu, Zhao, et al., 2004
Lu, X.; Zhao, M.; Kong, H.; Cai, J.; Wu, J.; Wu, M.; Hua, R.; Liu, J.; Xu, G., Characterization of cigarette smoke condensates by comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry (GC x GC/TOFMS) Part 2: Basic fraction, J. Sep. Sci., 2004, 27, 1-2, 101-109, https://doi.org/10.1002/jssc.200301659 . [all data]

Golovnya, Samusenko, et al., 1988
Golovnya, R.V.; Samusenko, A.L.; Lyapin, V.A., Prediction of linear temperature programmed retention indices of methylpyridines in capillary gas chromatography, Zh. Anal. Khim., 1988, 63, 2, 311-317. [all data]

Premecz and Ford, 1987
Premecz, J.E.; Ford, M.E., Gas chromatographic separation of substituted pyridines, J. Chromatogr., 1987, 388, 23-35, https://doi.org/10.1016/S0021-9673(01)94463-2 . [all data]

Rostad and Pereira, 1986
Rostad, C.E.; Pereira, W.E., Kovats and Lee retention indices determined by gas chromatography/mass spectrometry for organic compounds of environmental interest, J. Hi. Res. Chromatogr. Chromatogr. Comm., 1986, 9, 6, 328-334, https://doi.org/10.1002/jhrc.1240090603 . [all data]

Kim, 2001
Kim, J.S., Einfluss der Temperatur beim Rösten von Sesam auf Aroma und antioxidative Eigenschaften des Öls, PhD Thesis, Technischen Universität Berlin zur Erlangung des akademischen Grades, Berlin, 2001, 151. [all data]

Kubec, Drhová, et al., 1999
Kubec, R.; Drhová, V.; Velísek, J., Volatile compounds thermally generated from S-propylcysteine and S-propylcysteine sulfoxide - aroma precursors of Allium vegetables, J. Agric. Food Chem., 1999, 47, 3, 1132-1138, https://doi.org/10.1021/jf980974z . [all data]

Li, Gao, et al., 2000
Li, R.; Gao, S.-G.; Xiang, B.-R., Using improved BP neural network in predicting GC retention indices, Computers appl. chem. (Chinese), 2000, 17, 1-2, 113-114. [all data]

Baltes and Bochmann, 1987
Baltes, W.; Bochmann, G., Model reactions on roast aroma formations, V. Mass spectrometric identification of pyrifines, oxazoles, and carbocyclic compounds from the reaction of serine and threonine with sucrose under the conditions of coffee roasting, Z. Lebensm. Unters. Forsch., 1987, 185, 1, 5-9, https://doi.org/10.1007/BF01083331 . [all data]


Notes

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