الفهرس 
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Abstract
Schiff bases are an important class of chelating agents in coordination chemistry because of their ability to form stable complexes with different transition metals. Specifically, polythiophene derivatives have been chosen as multi-group compounds containing nitrogen and sulfur atoms that have been widely used as binders.Polythiophene derivatives have many good applications and uses, as they are used in the field of analytical chemistry, constructing complexes and in the biological field, such as DNA and protein binding. This Thesis contains three main chapters and references: Chapter one: INTRODUCTION This chapter contains a literature survey of the most important publications related to the subject of the thesis in the field of complexations of polythiophene derivatives with some elements as well as their biological importance. It also includes the basic science of corrosion, forms of corrosion and methods of protection from it. Publicationson corrosion of carbon steel in aqueous solutions and the ability of organic and inorganic inhibitors to resist corrosion are also reviewed. Chapter two: EXPERIMENTAL AND TECHNIQUES The experimental partincludes the chemical composition of the investigated materials, and procedures of preparation of the new Ni(II) and Cu(II) complexes, and solutions were listed, followed by a review of the measurements, devices used, experimental work steps and spectroscopic measurements. It also includes the composition of carbon steel used in the study as well as methods for preparing acid solutions (hydrochloric acid) and inhibitors used. It also describes chemical measurement methods (weight loss method) and electrochemical measurement methods. Chapter three: RESULTS AND DISCUSSION This chapter isdivided into two partsand can be summarized in the following points: Part (A): 1)Elemental analyses, IR, UV-visible spectra, electrical conductance values were appropriate with those values calculated from the molecular formula assigned to the proposed complexes which are further supported by mass studies. 2) The results of the infrared spectra and electronic absorption spectra showed the binding sites, the nature of the bond, and the presence of the solvent particles. The determination of the coordination sites was based on an accurate comparison between the spectrum of the complexes and the spectra of its ligands. This study concluded that: 1. L1345 is coordinated with Ni(II) and Cu(II) metal ions through the nitrogen atom of the amide and the other from the thiophene ring via the two sulfur atoms in complexes as a neutral tridentate ligand and formed distorted octahedral geometries for both [Cu2(L1190)(H2O)8]Cl4 and [Ni(L1345)(H2O)Cl2].H2O.EtOH complexes. 2. The L1190 bond is bound as a tetradentate neutral ligand through the two nitrogen atoms of the amide coordinate to one metal atom and the other from the thiophene ring via the two sulfur atoms to a second metal atom. It forms distorted octahedral geometries for both complexes of [Ni2(L1190)(H2O)6Cl2]Cl2.3H2O.2EtOH and Cu(L1345)(H2O)3]Cl2.H2O. 3)The results of the thermal analysis for the metal complexes and the decomposition patterns are discussed. The temperature curve showed the different stages of decomposition which ended with a constant weight corresponding to the fraction remaining after decomposition. 4)EDX chemical compositions and elemental distribution (mapping) of compound 5’-(4-fluorophenyl)-[2,2’-bithiophene]-5-carboximidamide (L1345) and L1190 and its Ni(II) and Cu(II) complexesare showing its main component of the existence elements on surface as C, N, O, F, S, Cl, and F without any doped metal.The EDX study is shows good agreement for formation of ligand metal complexes. 5) A biological study of the compounds that were prepared and their effectiveness as anti-bacterial, anti-fungal and anti-tumors on the cells of the breast and uterus are investigated.The results of the examination of cytotoxicity demonstrate the activity order against Mammary gland (MCF-7) were [Cu2(L1190)(H2O)8]Cl4 [Ni(L1345)(H2O)Cl2].H2O.EtOH [Ni2(L1190)(H2O)6Cl2]Cl2.3H2O.2EtOH [Cu(L1345)(H2O)3]Cl2.H2O. Therefore, these activities lie in the range between moderate and strong. 6)The results of MOE modeling, bond lengths, chemical reactivities, energy components (Kcal/mol) and binding energies (Kcal/mol) for all the isolated complexes were calculated. 7) The last part of this chapter includes the corrosion properties of the complexes and some organic compounds are discussed.A charge transfer resistance Rct values of the inhibited solution increase in order: L1345 [Cu(L1345)(H2O)3]Cl2.H2O [Ni(L1345)(H2O)Cl2].H2O.EtOH and the IE % values from the EIS method exhibited the same trend of Rct which in close agreement with the finding from the PP method. Also, with different concentrations of 2,5-diarylthiophene derivatives, the current corrosion densities also increase as compared to the existence of 1.0 M HCl solution alone for carbon steel. The sufficiency of inhibitionobtained from this technique is as follows: L1345 [Cu(L1345)(H2O)3]Cl2.H2O [Ni(L1345)(H2O)Cl2].H2O.EtOH. Part (B): Evaluation of the inhibitor efficiency by weight loss method in the presence and absence of three compounds (L1313, L1314 and L1216) in 1.0 M HCl at different temperatures L1313 > L1314 > L1216. The effect of three inhibitor compounds on the cathodic and anodic polarization of C-steel in 1M HCl was investigated. The order of increased inhibition efficiency for C-steel corrosion in 1.0 M HCl at all concentrations in the range 1x10-6- 21x10-6 M by polarization technique is L1313 > L1314 > L1216. The results obtained from (EIS) show that the corrosion reactions in the absence and presence of three inhibitors derivatives proceed under charge transfer control. The increase in concentration of the inhibitors leads to an increase in the value of the charge transfer resistance (Rct) i.e. a decrease of the corrosion rate of C-steel. The double layer capacitance (Cdl) of the corroding C-steel interface decreases with increase in the inhibitor concentration, suggesting an increase of the surface coverage of the inhibitor due to the adsorption of the inhibitor species at the C-steel surface.