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Lah, Myoung Soo
Nanoporous Materials Lab
Research Interests
  • Metal-Organic Frameworks (MOFs)

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Synthesis and characterization of mononuclear octahedral Fe(III) complex containing a biomimetic tripodal ligand, N-(benzimidazol-2-ylmethyl)iminodiacetic acid

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Title
Synthesis and characterization of mononuclear octahedral Fe(III) complex containing a biomimetic tripodal ligand, N-(benzimidazol-2-ylmethyl)iminodiacetic acid
Author
Moon, DohyunKim, JunghyunLah, Myoung Soo
Keywords
Biomimetic; Iron(III) complex; Superoxide dismutase; Tripodal tetradentate ligand
Issue Date
200610
Publisher
KOREAN CHEMICAL SOC
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.27, no.10, pp.1597 - 1600
Abstract
The mononuclear iron complex 1, Fe-III (Hbida)Cl(H2O), was synthesized using a tripodal tetradentate ligand, N-(benzimidazol-2-ylmethyl)iminodiacetic acid (H(3)bida), which has two carboxylate groups, one benzimidazoyl group, and one tertiary amine where it serves as a tetradentate chelating ligand for the octahedral Fe(III) ion. The four equatorial positions of the octahedral complex are occupied by two monodentate carboxylates, a benzimidazole nitrogen, and an oxygen of a water molecule. One of the axial positions is occupied by an apical nitrogen of the Hbida and the other by a chloride anion. The mononuclear octahedral complex 1 mimics the geometry of the key intermediate structure of the catalytic reaction cycle proposed for the FeSODs, which is a distorted octahedral geometry with three histidyl imidazoles, an aspartyl carboxylate, a superoxide anion, and a water molecule. The redox potential of complex 1, E-1/2 is -0.11V vs. Ag/AgCl (0.12 V vs. NHE), which is slightly lower than those reported for the most FeSODs. The magnetic susceptibility of complex 1 at room temperature is 5.83 mu(B) which is close to that of the spin only value, 5.92 mu(B) of high-spin d(5) Fe(III).
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ISSN
0253-2964
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