Synthesis and electrochemical investigation of a series of iron(II) complexes with bidentate,tridentate and hexadentate ligands |
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| Affiliation: | 1. Institute of Biological Science, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Biomedical Science, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. Department of Molecular Medicine, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia;4. Chemistry Department, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;1. Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional 2508, A. P. 14-740 México, D.F. 07000, México;2. Institut Charles Gerhardt Montpellier, UMR5253 CNRS, ENSCM/UM2/UM1, 8 rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France;3. Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida, Km. 6 Antigua Carretera a Progreso, A.P. 73, Cordemex, Mérida 97310, Yucatán, México;4. Department of Chemistry, Centre for Molecular Simulation and Institute for Quantum Science and Technology, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4 |
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| Abstract: | Iron(II) complexes of a bidentate, a hexadentate and a series of tridentate ligands have been prepared and characterized. Electrochemical properties have shown that of the tridentate ligands, those capable of dπ-pπ bonding between the pyridyl rings and central ligand atom can stabilize formal low oxidation states (I,O, −I) of the metal. A bidentate ligand, 2-(2-pyridyl) imidazole although resembling 2,2′-bipyridine in structure, does not stabilize any low oxidation states and its iron(II) complex is reduced irreversibly to iron(O). The iron(II) complex of a hexadentate ligand, tetra(2-picolyl)ethylenediamine, is reduced in two, one electron steps to yield formal Fe(I) and Fe(O) oxidation states. However, both of these reductions are totally irreversible at a Pt and HMDE electrode. |
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