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Synthesis, characterization, electrochemical behaviour and catalytic activity of manganese(II) complexes with linear and tripodal tetradentate ligands derived from Schiff bases

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Abstract

New manganese(II) complexes, [Mn(H2L)(H2O)2]Cl2· xH2O, with linear and tripodal tetradentate ligands have been synthesized and characterized by elemental analysis, molar conductance, i.r. spectra, magnetic measurements and electronic and e.s.r. spectra. The data show that the ligands are neutral and coordinate to manganese in a tetradentate manner; the other axial sites are occupied by the water molecules. Magnetic and e.s.r. data show that manganese(II) adopts a high-spin configuration in the complexes. The electrochemical behaviour of the complexes, determined by cyclic voltammetry, shows that the chelate structure, ligand geometry and electron donating effect of the ligand substituents are among the factors influencing the redox potentials of the complexes. In addition, we note that linear ligands stabilize the manganese(III) state to a greater extent than tripodal ligands and their complexes vigorously catalyse the disproportionation of hydrogen peroxide in the presence of added imidazole.

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Authors and Affiliations

  1. Laboratoire de Chimie de Coordination, Institut de Chimie, USTHB, BP 32, El Alia, Bab Ezzouar, Algiers, Algeria

    Safia Djebbar-Sid & Ouassini Benali-Baitich

  2. Laboratoire d'Energétique et Synthèse Inorganique, Université Claude Bernard, Boulevard du 11 Novembre 1918, 69622, Villeurbanne, France

    Jean Pierre Deloume

Authors
  1. Safia Djebbar-Sid
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  2. Ouassini Benali-Baitich
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  3. Jean Pierre Deloume
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Djebbar-Sid, S., Benali-Baitich, O. & Deloume, J.P. Synthesis, characterization, electrochemical behaviour and catalytic activity of manganese(II) complexes with linear and tripodal tetradentate ligands derived from Schiff bases. Transition Metal Chemistry 23, 443–447 (1998). https://doi.org/10.1023/A:1006945006419

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