A novel series of ferrocenyl surfactants was synthesized by the reaction of ferrocene disulfonic acid with different primary and tertiary fatty amines to produce the corresponding ammonium salts Fc[SO 3 -? NH 3 (CH 2 ) n CH 3 ] 2 , where n = 9, 11, or 15 and Fc[SO 3 -? NH(CH 3 ) 2 (CH 2 ) n CH 3 ] 2 , where n = 7 or 11, respectively, and where Fc = ferrocene. Chemical structures were confirmed by microelemental analysis, FTIR, and 1 H NMR spectroscopy. The critical micelle concentration of each prepared surfactant was determined using equilibrium surface tension. Furthermore, air/water interface parameters including effectiveness (p CMC ), efficiency (Pc 20 ), maximum surface excess (U max ), and minimum surface area (A min ) were determined at 30, 40, and 50°C. Thermodynamic parameters (DG°, DS°, and DH°) for both micellization and adsorption processes were recorded. The new synthesized surfactants were screened as antimicrobial agents against different bacterial and fungal organisms.
Two micellized Cu(II) and Fe(III) ion complexes of octadecyl diethylene tri-1-amide are used as nucleophilic reagents in the cleavage of the phosphate ester paraoxon. These complexes form metallomicelles, which coordinate with the paraoxon phosphorous (chemically similar to the nerve agent sarin). Association colloids (e.g., micelles, microemulsions, or vesicles) increase the rate of the nucleophilic reaction. Hence, it is reasonable to examine the hydrolysis process of paraoxon in aqueous metallomicelles. As micelles form and incorporate reactants, the rate constant should change; therefore, the rate constant should be affected by the critical micelle concentrations (CMC) of Cu(II) and Fe(III) complexes. The concentrations tested were the CMC value, two values lower, and two values higher. The CMC was found to be the most reactive concentration. The kinetic data (half-life times) for paraoxon degradation were 6.1 and 28.8 min in the presence of the Cu(II) and the Fe(III) metallomicelle complex, respectively. The stability constants of the metal complexes showed large values that denoted significant stability for both complexes.
In this study, cationic surfactants having different alkyl chain lengths were prepared by amidation of lauric, myristic, palmitic, stearic, oleic acids with diethylene triamine. The products were quaternized using chloroacetic acid. The chemical structure of the prepared compounds was elucidated using different spectroscopic techniques. The critical micelle concentration (CMC) and the free energy of the micellization and adsorption of these compounds were determined by surface tension and conductivity measurements. The products were evaluated as surface-active agents as well as corrosion inhibitors for steel alloy in 1 M hydrochloric and sulfuric acid, the results indicate that these materials have a high efficiency as corrosion inhibitors and as surface active agents. These results were correlated with the chemical structure of the prepared compounds.
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