الفهرس | Only 14 pages are availabe for public view |
Abstract 1- In the first chapter, a literature survey of the previous studies on Schiff bases and their complexes with different metal ions is given. ~J’his survey includes; potentiometric, spectrophotometric and studies on Schiff bases and their solid complexes. It includes also the use of some Schiff bases as analytical reagents for detection and determination oF transition metal ions spectrophotometrically 2- The experimental part (chapter-TI) includes the preparation of the Schiff bases under investigation. It comprises also information about the instruments used for conductornetric potentiometric, spectrophotomet nc, LR as well as ‘H NIVIR. 3- Chapter III includes the results and discussion and consists of two parts, the first part (A), comprising the studies in solutions of complexes formed between Schiff bases under investigation with transition metal ions (Cr3~, Fe3~, Co2~, Ni2+, Cu2~ and Cd2+). The studies include conductometric, potentiometric (at different temperatures; 298, 308 and 318 K) and spectrophotometric techniques from the conductometric measurements the stoichiometny of the different complexes is obtained. Potentiometric titrations of Schiff bases together with Cr3~, Fe3~, Co2~, Ni2+, Cu2~ and Cd2+ ions are performed in a medium of hydrochloric acid and potassium chloride. The proton-ligand formation constants log KH are determined as well as the formation constants of the complexes log KM. The stoichiometry and stability constants ofmetal complexes are also evaluated from the spectrophotometric methods namely the molar ratio and continuous variation methods. The optimum conditions for the complex formation are investigated universal buffer of 30% (v/v) ethanol was found to be the best medium |