الفهرس 
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Abstract
The macrocycles and their transition metal complexes have been well documented in the literature as good antimicrobial, antibacterial antifungal and anticancer agents. The current interest in macrocyclic Schiff bases is due to the presence of various donor atoms (N, donor), which exhibit diverse bonding modes leading to different structures of complexes. The main aim of the present thesis is focused on the preparation and characterization employing elemental analyses, thermal analyses (TGA and DrTGA), spectral (IR, UV-visible, 1H & 13C NMR and ESR) tools, mass and magnetic measurements as well as x-ray powder diffraction of new complexes of (31Z,32E,71Z,72E)-35,35,75,75-tetramethyl-2,4,6,8-tetraaza-1,5(1,4)-dibenzena-3,7(1,3)-dicyclohexanacyclooctaphane-32,72-diene (H2DPD) and (11E,12E,51E,52E)-11H,51H-2,4,6,8-tetraaza-1(1,3),5(3,1)-diindena-3,7(1,4)-dibenzenacyclooctaphane (H2IPD) with Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+ and VO2+ metal ions. The geometries are suggested for the prepared complexes based on the data evaluated from spectral and magnetic measurements; all complexes have octahedral geometries. Some theoretical calculations were applied. Also, the optical band gap was estimated for the complexes. Moreover, the redox behavior of the complexes has been evaluated from cyclic voltammetry measurements. Finally, the compounds displayed a potent activity against various bacterial strains as well as scavenging superoxide anions.