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Abstract
In this thesis, four Schiff bases were synthesized by the condensation of 4-diethyl aminobenzaldehyde and different fatty amines namely: dodecyl-, tetradecyl-, hexadecyl- and octadecyl amine. The quaternary ammonium salts of the prepared Schiff bases were given by the quaternization reaction with methyl iodide. The produced cationic ammonium Schiff bases were complexed with different transition metals namely: copper, cobalt and manganese in a molar ratio of 1 metal: 2 ligands.
The chemical structures of the synthesized cationic Schiff bases and their corresponded metal complexes were confirmed using elemental analyses, FTIR and 1H-NMR and atomic absorption spectroscopic analysis. The surface properties of all the synthesized compounds were determined based on the surface tension measurements at 25oC. The thermodynamic data of adsorption and micellization for their solutions were calculated based on the surface activity data. The synthesized compounds were mixed with nonionic polymer (polyethylene glycol-2000) with fixed ratio of the polymer (30 gm/l) and different molar ratio of the synthesized compounds. The surface activity of the formed mixtures was determined using surface tension measurements.
The synthesized compounds were evaluated as biocides for different bacterial strains and fungi. Also, these compounds were tested for their potent action as biocides against sulfur reducing bacteria as fatal microorganisms in the petroleum field.
The data of the chemical structure elucidation revealed the purity and accuracy of the experimental synthesis of the prepared chemicals.
The surface activity measurements showed the good surface activity of the synthesized compounds. The surface activity was completely dependent on the chemical structure of these compounds and the main factor which influences this activity was the hyDROPhobic chain length of these molecules. Also, the complexed form of these cationic Schiff bases was affected by the type of the transition metal in the complex molecule.
The thermodynamic calculations for these compounds in their solutions showed their tendency towards adsorption at the interface of the solutions and also their tendency towards micellization in the bulk.