Sublimation Enthalpies of Some Methyl Derivatives of Uracil from Vapor Pressure Measurements

The standard sublimation enthalpies for uracil, 1-methyluracil, 3-methyluracil, and 1,3-dimethyluracil, Δsub H°(298 K) = (128 ± 2), (124 ± 5), (121 ± 4), and (118 ± 4) kJ mol-1, respectively, were determined from their vapor pressures measured by the torsion method. The results of vapor pressure mea...

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Published in:Journal of chemical and engineering data 2000-03, Vol.45 (2), p.242-246
Main Authors: Brunetti, Bruno, Piacente, Vincenzo, Portalone, Gustavo
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Language:English
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Chemical thermodynamics
Chemistry
Elements, mineral and organic compounds
Exact sciences and technology
General and physical chemistry
Thermodynamic properties
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cited_by cdi_FETCH-LOGICAL-a390t-2fa093a9ea18905fde00482f34a5e7678c4de773cbe593bc0777eb5de766ec13
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creator Brunetti, Bruno
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Portalone, Gustavo
description The standard sublimation enthalpies for uracil, 1-methyluracil, 3-methyluracil, and 1,3-dimethyluracil, Δsub H°(298 K) = (128 ± 2), (124 ± 5), (121 ± 4), and (118 ± 4) kJ mol-1, respectively, were determined from their vapor pressures measured by the torsion method. The results of vapor pressure measurements were fit to the following linear equations:  uracil, log(p/kPa) = (12.29 ± 0.15) − (6634 ± 100) K/T (from 384 K to 494 K); 1-methyluracil, log(p/kPa) = (13.75 ± 0.15) − (6357 ± 150) K/T (from 343 K to 428 K); 3-methyluracil, log(p/kPa) = (13.59 ± 0.10) − (6210 ± 100) K/T (from 344 K to 419 K); 1,3-dimethyluracil, log(p/kPa) = (15.10 ± 0.10) − (6049 ± 100) K/T (from 311 K to 364 K). The different sublimation behavior of some compounds can be due to the presence of hydrogen bonds in their solid state.
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The results of vapor pressure measurements were fit to the following linear equations:  uracil, log(p/kPa) = (12.29 ± 0.15) − (6634 ± 100) K/T (from 384 K to 494 K); 1-methyluracil, log(p/kPa) = (13.75 ± 0.15) − (6357 ± 150) K/T (from 343 K to 428 K); 3-methyluracil, log(p/kPa) = (13.59 ± 0.10) − (6210 ± 100) K/T (from 344 K to 419 K); 1,3-dimethyluracil, log(p/kPa) = (15.10 ± 0.10) − (6049 ± 100) K/T (from 311 K to 364 K). 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subjects Chemical thermodynamics
Chemistry
Elements, mineral and organic compounds
Exact sciences and technology
General and physical chemistry
Thermodynamic properties
title Sublimation Enthalpies of Some Methyl Derivatives of Uracil from Vapor Pressure Measurements
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