Bifunctional N-Oxides of Alkyldiamidoamines

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 (ΓCMC), equilibrium surface tension at the CMC (γ CMC), cross-sectional area of the adsorbed surfactant molecule (A CMC), standard free energies of adsorption \(\left({\Updelta G_{\text{ads}}^{\text{o}} } \right),\) and micellization \( \left( {\Updelta G_{\text{CMC}}^{\text{o}}} \right).\)