Journal of Physical Chemistry p. 93 - 95 (1984)
Update date:2022-08-28
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Williams, R. Kenneth
Values have been obtained for the association constant for the interaction of sodium 8-chlorotheophyllinate with 1-methyl-3-(carbomethoxy)pyridinium iodide in aqueous solution at pH 7.0, I = 0.20, at various temperatures and pressures.From these data the apparent volume change on association is estimated to be Δ<*> = -6.5 (+/-0.5) cm3mol-1 at 25 deg C.Values for the compressibility increment were obtained within the range of ΔK = (1.6-2.0) x 1E-9 Pa-1.Values were also obtained for the association constant of sodium 8-chlorotheophyllinate with the methyl ester of trans-cinnamic acid in a methanol and water mixture at 1-atm pressure.The results are interpreted in terms of the volume change to be expected on association due to ion pairing, and the approach of aromatic rings in water.
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