Bifunctional <i>N</i>‐Oxides of Alkyldiamidoamines

Abstract

Abstract A homologous series of new surface‐active 1,1‐bis{[3‐( N , N ‐dimethylamino)ethyl]‐amido}alkane‐di‐ N ‐oxides were synthesized in the reaction of an appropriate diethyl 2‐alkylmalonate with N , N ‐dimethylethylenediamine followed by oxidation with an aqueous solution of hydrogen peroxide. The adsorption isotherms of their aqueous solutions were measured and evaluated to obtain adsorption parameters: critical micelle concentration (CMC), surface excess concentration (Γ CMC ), equilibrium surface tension at the CMC ( γ CMC ), cross‐sectional area of the adsorbed surfactant molecule ( A CMC ), standard free energies of adsorption and micellization