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 (Gamma(CMC)), equilibrium surface tension at the CMC (gamma(CMC)), cross-sectional area of the adsorbed surfactant molecule (A(CMC)), standard free energies of adsorption (Delta G(ads)(o)), and micellization (Delta G(CMC)(o)).