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Synthesis and Spectroscopic Characterization of Manganese(II), Iron(III) and Cobalt(III) Complexes of Macrocyclic Ligand. Potential of Cobalt(III) Complex in Biological Activity
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 Title & Authors
Synthesis and Spectroscopic Characterization of Manganese(II), Iron(III) and Cobalt(III) Complexes of Macrocyclic Ligand. Potential of Cobalt(III) Complex in Biological Activity
El-Tabl, Abdou S.; Shakdofa, Mohamad M.E.; El-Seidy, Ahmed M.A.;
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 Abstract
A new series of manganese(II), iron(III) and cobalt(III) complexes of 14-membered macrocyclic ligand, (3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane-1,8-diamine) have been prepared and characterized by elemental analyses, IR, UV-VIS, - and - NMR spectra, magnetic susceptibilities, conductivities, and ESR measurements. Molar conductance measurements in DMF solution indicate that the complexes are electrolytes. The ESR spectrum for cobalt(III) complex in after exposure to -rays at 77 K using a 0.2217 M rad vicrad source showed > > , indicating that, the unpaired electron site is mainly present in the orbital with covalent bond character. In this case, the ligand hyperfine tensors are nearly collinear with -tensors, so there is no major tendency to bend. Therefore, little extra delocalization via the ring lobe of the orbital occurs. However, the ESR spectrum in solid state after exposure to -rays at 77 K showed > > , indicating that, the unpaired electron site is mainly present in the ground state as the resulting spectrum contains a large number of randomly oriented molecules provided that, the principle directions of g and A tensors. Manganese (II) complex 2, , showed six isotropic lines characteristic to an unpaired electron interacting with a nucleus of spin 5/2, however, iron(III) complex 3, , showed spectrum of a high spin (I=1/2), configuration. The geometry of these complexes was supported by elemental analyses, IR, electronic and ESR spectral studies. Complex 1 showed exploitation in reducing the amount of electron adducts formed in DNA during irradiation with low radiation products.
 Keywords
Macrocyclic complexes;Spectral studies;magnetism;-rays on metal complexes and DNA;
 Language
English
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