Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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The Pressure Effect on the Ionic Association of the 3,5,N-trimethyl Pyridinium Iodide in Ethanol-Water Mixture

  • Jong-Gi Jee (Department of Chemistry, Teacher's College, KyungPook National University) ;
  • Young Hwa Lee (Department of Chemistry, Teacher's College, KyungPook National University) ;
  • Kyung-Hee Lee (Department of Chemistry, Teacher's College, KyungPook National University) ;
  • Oh Cheun Kwun (Department of Chemistry, Hanyang University)
  • Published : 1984.06.20
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Abstract

The association constants (K) of 3,5,N-trimethyl pyridinium iodide in 95 volume percent ethanol-water mixed solvent were determined by a modified UV and conductance method at $25^{\circ},\;30{\circ},\;40{\circ}\;and\;50{\circ}C$ over the pressure range 1 to 2000 bars. The association process is enhanced with increasing pressure and decreasing temperature. From K values, we obtained the total partial molar volume change (${\Delta}V$) and some thermodynamic parameters. The electrostriction volume (${\Delta}V_{el}$) and intrinsic volume (${\Delta}V_{in}$) were also evaluated. The values of ${\Delta}V,\;{\Delta}V_{el},\;{\Delta}V_{in}$ are negative, negative and positive, respectively, and the absolute values of all these three decrease with increasing pressure and temperature. The ion-pair size (a) were varied 3 to 6 ${\AA}$, with pressure and temperature. The solvation number (n) decreased from 2 to 0.5 with increasing temperature.

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