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Pyridine, 3,4-dimethyl-

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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, Kenneth Kroenlein director
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tboil436.7KN/AWeast and Grasselli, 1989BS
Tboil452.3KN/AMajer and Svoboda, 1985 
Quantity Value Units Method Reference Comment
Tfus260.65KN/AAnonymous, 1968TRC
Tfus262.11KN/ACoulson, Cox, et al., 1959Uncertainty assigned by TRC = 0.05 K; TRC
Quantity Value Units Method Reference Comment
Ttriple262.70KN/AChirico, Hossenlopp, et al., 1994Uncertainty assigned by TRC = 0.01 K; TRC
Quantity Value Units Method Reference Comment
Tc683.8KN/AMajer and Svoboda, 1985 
Tc683.71KN/AAmbrose, Cox, et al., 1960Uncertainty assigned by TRC = 0.4 K; Visual, PRT, IPTS-48, with decomp.; TRC
Tc683.75KN/ACox, 1960Uncertainty assigned by TRC = 1. K; measured by R. Townsend to be pub. later; TRC
Quantity Value Units Method Reference Comment
Deltavap50.54kJ/molN/AMajer and Svoboda, 1985 
Deltavap51.80kJ/molECox, 1960ALS

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Method Reference Comment
39.99452.3N/AMajer and Svoboda, 1985 
47.6355.N/ASakoguchi, Ueoka, et al., 1995Based on data from 288. - 422. K.; AC
46.6360.EBSteele, Chirico, et al., 1995Based on data from 341. - 495. K.; AC
44.2400.EBSteele, Chirico, et al., 1995Based on data from 341. - 495. K.; AC
41.7440.EBSteele, Chirico, et al., 1995Based on data from 341. - 495. K.; AC
39.0480.EBSteele, Chirico, et al., 1995Based on data from 341. - 495. K.; AC
44.8400.AStephenson and Malanowski, 1987Based on data from 385. - 454. K. See also Kkykj and Repas, 1973.; AC
48.8328.CMajer, Svoboda, et al., 1985AC
47.6343.CMajer, Svoboda, et al., 1985AC
45.9368.CMajer, Svoboda, et al., 1985AC

Enthalpy of vaporization

ΔvapH = A exp(-βTr) (1 − Tr)β
    ΔvapH = Enthalpy of vaporization (at saturation pressure) (kJ/mol)
    Tr = reduced temperature (T / Tc)

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Temperature (K) A (kJ/mol) beta Tc (K) Reference Comment
328. - 368.69.650.3181683.8Majer and Svoboda, 1985 

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
446.3 - 453.504.206911618.466-67.044Coulson, Cox, et al., 1959, 2Coefficents calculated by NIST from author's data.

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Reference Comment
14.7262.7Chirico, Hossenlopp, et al., 1994, 2AC

Temperature of phase transition

Ttrs (K) Initial Phase Final Phase Reference Comment
241.100crystaline, IIcrystaline, ISteele, Chirico, et al., 1986DH
262.704crystaline, IliquidSteele, Chirico, et al., 1986DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


References

Go To: Top, Phase change data, Notes

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

Weast and Grasselli, 1989
CRC Handbook of Data on Organic Compounds, 2nd Editon, Weast,R.C and Grasselli, J.G., ed(s)., CRC Press, Inc., Boca Raton, FL, 1989, 1. [all data]

Majer and Svoboda, 1985
Majer, V.; Svoboda, V., Enthalpies of Vaporization of Organic Compounds: A Critical Review and Data Compilation, Blackwell Scientific Publications, Oxford, 1985, 300. [all data]

Anonymous, 1968
Anonymous, X., Chemicals and Plastics Physical Properties, 1968, Union Carbide Corp., product bulletin, 1968. [all data]

Coulson, Cox, et al., 1959
Coulson, E.A.; Cox, J.D.; Herington, E.F.G.; Martin, J.F., The Preparation and Physical Properties of the Pure Lutidines, J. Chem. Soc., 1959, 1959, 1934. [all data]

Chirico, Hossenlopp, et al., 1994
Chirico, R.D.; Hossenlopp, I.A.; Gammon, B.E.; Knipmeyer, S.E.; Steele, W.V., Heat capacities of the six dimethylpyridines between the temperatures 10 K and 445 K and methyl-group rotational barriers in the solid state a,b, J. Chem. Thermodyn., 1994, 26, 11, 1187, https://doi.org/10.1006/jcht.1994.1138 . [all data]

Ambrose, Cox, et al., 1960
Ambrose, D.; Cox, J.D.; Townsend, R., The critical temperatures of forty organic compounds, Trans. Faraday Soc., 1960, 56, 1452. [all data]

Cox, 1960
Cox, J.D., The second virial coefficients, latent heats of vaporization and heats of formation of the lutidines, Trans. Faraday Soc., 1960, 56, 959. [all data]

Sakoguchi, Ueoka, et al., 1995
Sakoguchi, Akihiro; Ueoka, Ryuichi; Kato, Yasuo; Arai, Yasuhiko, Vapor Pressures of Alkylpyridines and Alkylpyrazines., KAGAKU KOGAKU RONBUNSHU, 1995, 21, 1, 219-223, https://doi.org/10.1252/kakoronbunshu.21.219 . [all data]

Steele, Chirico, et al., 1995
Steele, W.V.; Chirico, R.D.; Nguyen, A.; Knipmeyer, S.E., Vapor pressures, high-temperature heat capacities, critical properties, derived thermodynamic functions, and barriers to methyl-group rotation, for the six dimethylpyridines, The Journal of Chemical Thermodynamics, 1995, 27, 3, 311-334, https://doi.org/10.1006/jcht.1995.0030 . [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]

Kkykj and Repas, 1973
Kkykj, J.; Repas, M., Petrochemia, 1973, 13, 179. [all data]

Majer, Svoboda, et al., 1985
Majer, V.; Svoboda, V.; Lencka, M., Enthalpies of vaporization and cohesive energies of dimethylpyridines and trimethylpyridines, The Journal of Chemical Thermodynamics, 1985, 17, 4, 365-370, https://doi.org/10.1016/0021-9614(85)90133-8 . [all data]

Coulson, Cox, et al., 1959, 2
Coulson, E.A.; Cox, J.D.; Herington, E.F.G.; Martin, J.F., The Preparation and Physical Properties of the Pure Lutidines, J. Chem. Soc., 1959, 1934-1940, https://doi.org/10.1039/jr9590001934 . [all data]

Chirico, Hossenlopp, et al., 1994, 2
Chirico, R.D.; Hossenlopp, I.A.; Gammon, B.E.; Knipmeyer, S.E.; Steele, W.V., Heat capacities of the six dimethylpyridines between the temperatures 10 K and 445 K and methyl-group rotational barriers in the solid state a,b, The Journal of Chemical Thermodynamics, 1994, 26, 11, 1187-1218, https://doi.org/10.1006/jcht.1994.1138 . [all data]

Steele, Chirico, et al., 1986
Steele, W.V.; Chirico, R.D.; Collier, W.B.; Hossenlopp, I.A.; Nguyen, A.; Strube, M.M., Thermochemical and thermophysical properties of organic nitrogen compounds found in fossil materials, NIPER Report, 1986, 188, 112p. [all data]


Notes

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