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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 5, Number 3
BKCSDE 5(3)
March 20, 1984 

 
Title
The Pressure Effect on the Ionic Association of the 3,5,N-trimethyl Pyridinium Iodide in Ethanol-Water Mixture
Author
Jong-Gi Jee, Young-Hwa Lee, Kyung-Hee Lee, Oh Cheun Kwun
Keywords
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°, 30°, 40°and 50℃ 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 (ΔV) and some thermodynamic parameters. The electrostriction volume (ΔVel) and intrinsic volume (ΔVin) were also evaluated. The values of ΔV, ΔVel, ΔVin 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 Å, with pressure and temperature. The solvation number (n) decreased from 2 to 0.5 with increasing temperature.
Page
112 - 117
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