Abstract
A series of novel metallosurfactants (IIIa-d) was prepared and evaluated as surface active agents. The synthesis was carried out through two steps: the first was the reaction of fatty acids (Ia-d) (lauric, palmitic, myristic and steric acid) with morpholine (tetrahydro-1,4-oxazine) to give morpholin-4-yl-alkan-1-one (IIa-d), respectively. The second step is reaction of product of the first step (compounds IIa-d) with Fe (III) to give (IIIa-d) metallosurfactants. The chemical structures of the prepared compounds were elucidated with elemental analysis, FTIR and H-1 NMR spectroscopic tools. The surface properties of the prepared metallosurfactants were determined at different temperature 25, 35, and 45 degrees C. The surface tension (gamma), critical micelle concentration (CMC), surface tension at CMC (gamma(cmc)), effectiveness (pi(cmc)), efficiency (Pc-2o), maximum surface excess (Gamma(max)), and minimum surface area (A(min)) were determined. Thermodynamic data including, free energy, entropy and enthalpy changes (Delta G, Delta S, Delta H) for adsorption at the air-water interface and also for micellization in the bulk of surfactant solutions were calculated. The antimicrobial activity of the prepared compounds was determined via the inhibition zone diameter technique against Gram-positive, Gram-negative bacteria, and some fungal strains as mold and yeast. The results indicate that the prepared ferrosurfactants have a good surface properties and biological activities against the tested microorganism.