Bulletin of the Korean Chemical Society

  • 제4권3호
  • /
  • Pages.115-119
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  • 1983
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  • 0253-2964(pISSN)
  • /
  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Thermodynamics of 2, N-Dimethyl Pyridinium Iodide in Ethanol-Water Mixture under High Pressure

  • Jee, Jong-Gi (Department of Chemistry, Teacher's College, Kyungpook National University) ;
  • Lee, Young-Hwa (Department of Chemistry, Teacher's College, Kyungpook National University) ;
  • Woo, Eui-Ha (Department of Chemistry, Teacher's College, Kyungpook National University) ;
  • Lee, Kyung-Hee (Department of Chemistry, Teacher's College, Kyungpook National University)
  • 발행 : 1983.06.20
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초록

The ionic association constants (K) of 2, N-dimethyl pyridinium iodide (2NDMPI) in 95 volume percentage ethanol-water mixture were determined by a modified UV and conductance method at $20^{\circ}C{\sim}50^{\circ}C$ under 1 to 2000 bars. The K values increase with increasing pressure and decrease with temperature. The total partial molar volume change (${\Delta}V$) has relatively small negative value and the absolute ${\Delta}V$ value decrease with increasing pressure and temperature. The ion size (a) and solvation number (n) of 2NDMPI were about 5 $\AA$ and changed from 1 to 3 with decreasing temperature. Other thermodynamic parameters such as enthalpy (${\Delta}H^{\circ}$) and entropy (${\Delta}S^{\circ}$) for the equilibrium of the 2NDMPI were evaluated. From all the parameters mentioned above, we came to conclusion that the electrostriction effect of 2NDMPI in the ethanol-water mixture is enhanced with increasing pressure and decreasing temperature.

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참고문헌

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피인용 문헌

  1. Apparent Molar Volume and Viscosity ofN-Methylpyridinium Iodide and Its Methyl-Substituted Derivatives in Water vol.63, pp.5, 1990, https://doi.org/10.1246/bcsj.63.1503
  2. Conductivity ofN-Methylpyridinium Iodide and Its Methyl Substituted Derivatives in Water–Ethanol Mixture vol.64, pp.12, 1983, https://doi.org/10.1246/bcsj.64.3718