Electrochemical and kinetic response of heterobinuclear Ni(II)Zn(II) complexes derived from unsymmetrical lateral macrobicyclic tricompartmental ligands |
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Authors: | M Thirumavalavan P Akilan |
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Institution: | a Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India b Departamento de Engenharia Química, Instituto Superior Técnico, Complexo I, Av. Rovisco Pais 1, 1049-002 Lisboa, Portugal |
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Abstract: | Using the precursor compound 3,4:10,11-dibenzo-1,13N,N′-bis{(3-formyl-2-hydroxy-5-methyl)benzyl}diaza]-5,9-dioxocyclopentadecane, a series of macrobicyclic heterobinuclear Ni(II) Zn(II) complexes have been synthesized from the corresponding mononuclear nickel(II) complexes via a template method by Schiff’s base condensation. Electrochemical and kinetic studies of the complexes have been carried out on the basis of macrocyclic ring size. Cyclic voltammetry and controlled electrolysis studies indicate that the nickel(II) metal ion in the heterobinuclear complexes undergo quasireversible one electron reduction and oxidation, whereas the zinc(II) metal ion does not undergo any reduction and oxidation. All the heterobinuclear Ni(II) Zn(II) complexes are ESR inactive and diamagnetic in nature. The kinetics of hydrolysis of 4-nitrophenyl phosphate explores that the catalytic activities of the complexes are found to increase with macrocyclic ring size of the complexes. As the macrocyclic ring size increases, the spectral, electrochemical and catalytic studies of the complexes show variation due to distortion in the geometry of metal centre. |
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Keywords: | Heterobinuclear complexes Ni(II) els-cdn Zn(II) complexes" target="_blank">com/sd/entities/sbnd" class="glyphImg">Zn(II) complexes Cyclic voltammetry Macrocyclic ring size Phosphate hydrolysis |
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