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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 6, Number 1
January 20, 1985 

A Study of the Ionic Association of the Substituted N-Methyl Pyridinium Iodide (Ⅱ), 4,N-Dimethyl Pyridinium Iodide in Ethanol-Water Mixture
Oh Cheun Kwun, Jong Gi Jee
The electrical conductance and UV absorbance of 4,N-dimethyl Pridinium Iodide (NDMPI) were measured in the ethanol volume percentage, 95, 90, 80 and 60 of an ethanol-water mixture at 15, 25, 35 and 45℃. Ionic association constants(K) of NDMPI were evaluated in accordance with a combined method of conductance UV absorbance. The ion size parameter (γ±) and dipole momemt (μA+D-) of NDMPI were obtained from the values of K and dielectric constant. The μA+D- values were in good agreement with the values of transition moment(μmn) which is calculated form the UV peak values. The large negative values of the electrical enthalpy (ΔHel°) and entropy (ΔSel° ) have proved that NDMPI had a positive hydration. The positive values of entropy (ΔS°) means the formation of NDMPI ion goes with dehydration.
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