Complex formation between dodecylpyridinium chloride and multicharged anionic planar substances

Langmuir : the ACS Journal of Surfaces and Colloids
Kiyofumi Murakami

Abstract

The complex formation between dodecylpyridinium chloride (DPC) and multicharged anionic planar substances, 14 azo dyes and 3 benzene- or naphthalenesulfonates, has been studied by the potentiometric titration using a surfactant selective electrode. The agreement between the observed maximum binding number and the number of anionic charges (n) on dye molecules showed n:1 complex formation. The binding isotherms were found to be composed of two types of binding; one is the noncooperative binding observed at low surfactant concentrations and the other is the cooperative binding at the higher concentrations. The microscopic binding constant for the noncooperative binding was found to take the values in the range of 50-200 mol(-)(1) dm(3) for many of the substances, but, takes more large values up to 2500 mol(-)(1) dm(3) for the substances which have a large hydrophobic part or the structure of separate hydrophobic and hydrophilic regions. A multiple regression analysis showed that the data of the corresponding standard free energy change of binding were well interpreted by the equation (in unit of kJ mol(-)(1)) DeltaG degrees = - 5.85 log P(S) - 1.68 log P(D) - 2.12z + 28.4, where P(S) and P(D) are the partition coefficients of the...Continue Reading

Citations

Dec 18, 2013·Colloids and Surfaces. B, Biointerfaces·Yuhang Cai, Yakov Lapitsky
Nov 9, 2010·The Journal of Physical Chemistry. B·Immanuel WillerichFranziska Gröhn
Nov 5, 2011·Journal of the American Chemical Society·Immanuel Willerich, Franziska Gröhn

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