2,4(1H,3H)-Pyrimidinedione, 1,3-dimethyl-

Data at NIST subscription sites:

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.


Phase change data

Go To: Top, 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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny 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
Tfus392.5KN/AZielenkiewicz, Zielenkiewicz, et al., 1984Uncertainty assigned by TRC = 0.5 K; TRC
Quantity Value Units Method Reference Comment
Δvap71. ± 3.kJ/molVBeak and White, 1982ALS
Quantity Value Units Method Reference Comment
Δsub96.9 ± 1.2kJ/molCImamura, Takahashi, et al., 1989ALS
Δsub96.4 ± 1.4kJ/molCMurata, Sakiyama, et al., 1985AC
Δsub92.kJ/molVClark, Peschel, et al., 1965ALS

Enthalpy of sublimation

ΔsubH (kJ/mol) Temperature (K) Method Reference Comment
96.900298.15N/AImamura, Takahashi, et al., 1989DH
115.8 ± 3.0338.TEBrunetti, Piacente, et al., 2000Based on data from 311. to 367. K.; AC
101.7 ± 2.1338.QRTeplitsky, Yanson, et al., 1980Based on data from 313. to 363. K.; AC
46. ± 4.2426.HASNowak, Szczepaniak, et al., 1978Based on data from 400. to 454. K.; AC
92.344. to 370.HASClark, Peschel, et al., 1965, 2AC

Entropy of sublimation

ΔsubS (J/mol*K) Temperature (K) Reference Comment
325.0298.15Imamura, Takahashi, et al., 1989DH

Enthalpy of fusion

ΔfusH (kJ/mol) Temperature (K) Reference Comment
23.100392.5Zielenkiewicz, Zielenkiewicz, et al., 1984, 2DH
14.6398.Domalski and Hearing, 1996AC

Entropy of fusion

ΔfusS (J/mol*K) Temperature (K) Reference Comment
58.9392.5Zielenkiewicz, Zielenkiewicz, et al., 1984, 2DH

Enthalpy of phase transition

ΔHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
18.400394.crystaline, IIliquidSakiyama and Imamura, 1989Melting of the metastable phase.; DH
14.600398.crystaline, IliquidSakiyama and Imamura, 1989Melting of the stable phase.; DH

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.

Zielenkiewicz, Zielenkiewicz, et al., 1984
Zielenkiewicz, A.; Zielenkiewicz, W.; Malanowski, S., Thermodynamic Excess Functions of Dilute Aqueous Solutions of Alkylated Pyrimidines and Aminopurines and Caffeine, Thermochim. Acta, 1984, 74, 95. [all data]

Beak and White, 1982
Beak, P.; White, J.M., Relative enthalpies of 1,3-dimethyl-2,4-pyrimidinedione, 2,4-dimethoxypyrimidine, and 4-methoxy-1-methyl-2-pyrimidinone: estimation of the relative stabilities of two protomers of uracil, J. Am. Chem. Soc., 1982, 104, 7073-7077. [all data]

Imamura, Takahashi, et al., 1989
Imamura, A.; Takahashi, K.; Murata, S.; Sakiyama, M., Standard enthalpies of formation of trimethyl cyanurate, malonamide, and 1,3-dimethyluracil, J. Chem. Thermodyn., 1989, 21, 237-246. [all data]

Murata, Sakiyama, et al., 1985
Murata, S.; Sakiyama, M.; Seki, S., Sublimation calorimetric studies using a calvet microcalorimeter, Thermochimica Acta, 1985, 88, 1, 121-126, https://doi.org/10.1016/0040-6031(85)85419-8 . [all data]

Clark, Peschel, et al., 1965
Clark, L.B.; Peschel, G.G.; Tinoco, I., Jr., Vapor spectra and heats of vaporization of some purine and pyrmidine bases, J. Phys. Chem., 1965, 69, 3615. [all data]

Brunetti, Piacente, et al., 2000
Brunetti, Bruno; Piacente, Vincenzo; Portalone, Gustavo, Sublimation Enthalpies of Some Methyl Derivatives of Uracil from Vapor Pressure Measurements, J. Chem. Eng. Data, 2000, 45, 2, 242-246, https://doi.org/10.1021/je9902802 . [all data]

Teplitsky, Yanson, et al., 1980
Teplitsky, A.B.; Yanson, I.K.; Glukhova, O.T.; Zielenkiwicz, A.; Zielenkiewicz, W.; Wierzchowski, K.L., Thermochemistry of aqueous solutions of alkylated nucleic acid bases, Biophysical Chemistry, 1980, 11, 1, 17-21, https://doi.org/10.1016/0301-4622(80)85003-4 . [all data]

Nowak, Szczepaniak, et al., 1978
Nowak, M.J.; Szczepaniak, K.; Barski, A.; Shugar, D.Z., Z. Naturforsch. C, 1978, 33C, 876. [all data]

Clark, Peschel, et al., 1965, 2
Clark, L.B.; Peschel, G.G.; Tinoco, I., Jr., Vapor spectra and heats of vaporization of some purine and pyrimidine bases, Not In System, 1965, 3615-3618. [all data]

Zielenkiewicz, Zielenkiewicz, et al., 1984, 2
Zielenkiewicz, A.; Zielenkiewicz, W.; Malanowski, S., Thermodynamic excess functions of diluted aqueous solutions of alkylated pyrimidines and amino purines, and caffeine, Thermochim. Acta, 1984, 74, 95-111. [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [all data]

Sakiyama and Imamura, 1989
Sakiyama, M.; Imamura, A., Thermoanalytical characterization of 1,3-dimethyluracil and malonamide crystals, Thermochim. Acta, 1989, 142(2), 365-370. [all data]


Notes

Go To: Top, Phase change data, References