Current time in Korea 17:55 Dec 04 (Fri) Year 2020 KCS KCS Publications
KCS Publications
My Journal  Log In  Register
HOME > Search > Browsing(BKCS) > Archives

Bulletin of the Korean Chemical Society (BKCS)

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

The Pressure Effect on the Ionic Association of the 3,5,N-trimethyl Pyridinium Iodide in Ethanol-Water Mixture
Jong-Gi Jee, Young-Hwa Lee, Kyung-Hee Lee, Oh Cheun Kwun
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.
112 - 117
Full Text