Ion exchange in micellar solutions. 7. Effect of detergent structure on the binding and reactivity of hydroxide in cationic micellar solutions

Abstract

also on the relative amounts of the two species present.Experimental Section 2-Naphthoic acid was obtained from Aldrich Chemical Co. at a purity of 99%. Material used in the fluorescence decay measurements was recrystallized from a 50% ethanol solution. Absolute ethanol (U.S. Industrial Chemical Corp.) and distilled water were used without further purification. All other chemicals were of reagent grade quality (Mallinckrodt Chemical Co.) and were used without further purification.Solutions were deaerated with nitrogen prior to spectral or decay measurements. Emission spectra were obtained with a Baird Atomic Model SF-1 fluorescence spectrometer. Quantum efficiency measurements were made with 2-naphthol as a standard for the free 2-naphthoic acid emission and quinine sulfate as a standard for the pro-

Growth of Cetyltrimethylammonium Chloride and Acetate Micelles with Counterion Concentration

“…For CTACl, the values K 1 ϭ Ϫ5.00, K 2 ϭ 0.75, and ␣ ϭ 0.25 were employed throughout (20). For CTAOAc, the values K 1 ϭ Ϫ4.14 and K 2 ϭ 0.46, which reproduce the data of Toullec and Couderc (23) for the acetate concentration dependence of the cmc of CTAOAc, were employed in Eq.…”

Ion Exchange Equilibrium in Polyelectrolyte Solutions through the CHCl3/Water Interface

“…On the other hand, the ion exchange equilibrium in electrical double-layer systems is a basic problem which was first studied in rigid systems such as zeolites (4)(5)(6), later in nonrigid systems such as micelles (7)(8)(9)(10), and more recently in polyelectrolytes (11)(12)(13)(14)(15)(16). In the later case, the general feature is that selectivity of a given polyion for different counterions is determined by the difference in electrostatic energy of the counterions.…”

Counterion Exchange Selectivity in Detergent–Polymer Aggregates

“…Although several anionic surfac-in the usual manner. N-Methyl-4-cyanopyridinium (MCP / ) tants interact with PEG, other types of detergents ( cat-chloride (17) and the sodium salt of the luminescence probe ionic, non-ionic, or zwitterionic ) appear to have little or (18) tris(4,4-dicarboxybipyridine)ruthenium(II) (RuL were prepared and purified by literature procedures. Pyrene (Aldrich) was purified as described previously (11 dium chloride (Merck, p.a.…”