“…The nearly zero intercept in this correlation means that equilibrium entropies of sublimation are approximately the same for all those substances. This correlation was now extended to include the present results as well as the published results for other quinolines previously reported: four aminoquinolines, two cyanoquinolines, four nitroquinolines, and phenylquinoline . The linear correlation ( r = 0.989) is shown in Figure and represented by eq 7: 3 Dependence of the enthalpies of sublimation on the temperature of sublimation at p = 0.5 Pa: ○, substituted quinoxalines; ·, substituted quinolines.…”
Section: Resultssupporting
confidence: 62%
“…This correlation was now extended to include the present results as well as the published results for other quinolines previously reported: four aminoquinolines, 18 two cyanoquinolines, 19 four nitroquinolines, 20 and phenylquinoline. 21 The linear correlation (r ) 0.989) is shown in Figure 3 and represented by eq 7:…”
The Knudsen mass-loss effusion technique was used to measure the vapor pressures at different
temperatures of the following substituted quinoxalines: 2-hydroxyquinoxaline, between 383.17 K and
399.15 K; 2-hydroxy-3-methylquinoxaline, between 375.16 K and 391.15K; 2,3-dichloroquinoxaline,
between 313.15 K and 329.15 K; 2,3,6,7-tetrachloroquinoxaline, between 347.16 K and 361.17 K; 2,3-dimethylquinoxaline between 294.14 K and 308.14 K; 2,3-bis(bromomethyl)quinoxaline, between 351.14
K and 365.14 K. From the temperature dependence of the vapor pressure, the standard molar enthalpies
of sublimation at the mean temperature of the experimental range were derived by the Clausius−Clapeyron equation. From these results the standard molar enthalpies, entropies, and Gibbs functions
of sublimation at T = 298.15 K were calculated. An empirical equation for estimating vapor pressure−temperature data from enthalpies of sublimation values is presented.
“…The nearly zero intercept in this correlation means that equilibrium entropies of sublimation are approximately the same for all those substances. This correlation was now extended to include the present results as well as the published results for other quinolines previously reported: four aminoquinolines, two cyanoquinolines, four nitroquinolines, and phenylquinoline . The linear correlation ( r = 0.989) is shown in Figure and represented by eq 7: 3 Dependence of the enthalpies of sublimation on the temperature of sublimation at p = 0.5 Pa: ○, substituted quinoxalines; ·, substituted quinolines.…”
Section: Resultssupporting
confidence: 62%
“…This correlation was now extended to include the present results as well as the published results for other quinolines previously reported: four aminoquinolines, 18 two cyanoquinolines, 19 four nitroquinolines, 20 and phenylquinoline. 21 The linear correlation (r ) 0.989) is shown in Figure 3 and represented by eq 7:…”
The Knudsen mass-loss effusion technique was used to measure the vapor pressures at different
temperatures of the following substituted quinoxalines: 2-hydroxyquinoxaline, between 383.17 K and
399.15 K; 2-hydroxy-3-methylquinoxaline, between 375.16 K and 391.15K; 2,3-dichloroquinoxaline,
between 313.15 K and 329.15 K; 2,3,6,7-tetrachloroquinoxaline, between 347.16 K and 361.17 K; 2,3-dimethylquinoxaline between 294.14 K and 308.14 K; 2,3-bis(bromomethyl)quinoxaline, between 351.14
K and 365.14 K. From the temperature dependence of the vapor pressure, the standard molar enthalpies
of sublimation at the mean temperature of the experimental range were derived by the Clausius−Clapeyron equation. From these results the standard molar enthalpies, entropies, and Gibbs functions
of sublimation at T = 298.15 K were calculated. An empirical equation for estimating vapor pressure−temperature data from enthalpies of sublimation values is presented.
“…As part of our interest on the thermochemistry of nitrogen heterocycles, in previous work, we have studied the thermochemistry of several substituted hydroxyquinolines [8][9][10][11], alkyl substituted quinolines [12,13], aminoquinolines [14,15], cyanoquinolines [16], nitroquinolines [15,17], phenylquinolines [18] and hydroxyisoquinolines [19] in order to test the possibility of a similar estimation scheme as the one developed by Cox [20] for benzene derivatives. In the present work we extend our study to the thermochemistry of chloroquinolines.…”
“…The thermochemical study of nitrogen heterocyclic molecules derived from pyridine and pyrazine, as well as the study of the corresponding bicyclic systems generated when a benzene ring fuses to those species, resulting quinoline and quinoxaline derivatives, has been one of the main interests of researchers in our laboratory, in order to contribute to the interpretation of their behaviour, establishing relationships among of the energetical, structural, and reactivity characteristics [2][3][4][5][6][7][8][9][10][11][12][13]. On the other hand, we have been involved over the last decade in the development of studies on the energetics of the (N-O) bonds in some classes of Noxide derivatives, namely pyridine N-oxide, pyrazine N-oxide, quinoline N-oxide, and quinoxaline N-oxide derivatives.…”
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