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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 5, Number 1
January 20, 1984 

A Study of the Ionic Association of the Substituted N-Methyl Pyridinium Iodides (Ⅰ). N-Methyl Pyridinium Iodide in Ethanol-Water Mixture
Jong Gi Jee, Oh Cheun Kwun
The ionic association constant (K) of N-methyl pyridinium iodide (NMPI) ion in several ethanol-water mixtures were determined by the combination of UV spectroscopy and conductance measurements using the Shedlovsky function as a correction factor. The measurement of electrical conductance and UV absorption were performed in 95, 90, 80 and 60 volume percentages of ethanol in the solvent mixture at 15, 25, 35 and 45 (±0.1) ℃. The ion size parameter (rA+D-) and the dipole momentl(μA+D-) of NMPI ion were obtained from he linear plots of ln K vs. (1/D) and (D - 1)/(2D + 1), respectively. These μA+D- values were in good agreement with the values of transition moment calculated from the equation, μnm = 6.5168× 10-2×(εmaxν1/2/νmax)1/2 (Debye) which we have derived. The thermodynamic parameters indicate (1) that the water dipoles have an ordered rearrangement around the dipolar NMPI ions rather than the configuration existing in bulk free waters; and (2) that the equilibrium state between NMPI ion and its component ions are controlled by entropy.
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