4.6 Article

Electrochemical study of the Mn(II/III) oxidation of tris (polypyridine)manganese(II) complexes

期刊

ELECTROCHIMICA ACTA
卷 391, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138965

关键词

Polypyridine; Redox potential; DFT; Tris(1,10-phenanthroline)manganese(II)

资金

  1. South African National Research Foundation [129270, 132504]
  2. Central Research Fund of the University of the Free State, Bloemfontein
  3. Norwegian Supercomputing Program (UNINETT Sigma2) [NN9684K]

向作者/读者索取更多资源

This study presents the electrochemical behavior of a series of tris(polypyridine) manganese(II) complexes with substituents ranging from electron withdrawing to electron donating. The Mn(II/III) redox couple shows irreversible behavior, which may be attributed to geometry distortion or electron rearrangement upon oxidation. The study also establishes a linear relationship between DFT calculated solvent phase energies and experimental reduction potentials, accurately predicting the reduction potentials of related complexes.
The electrochemical behaviour of a series of tris(polypyridine)manganese(II) complexes containing substituents ranging from electron withdrawing (Cl) to electron donating (OMe) is presented. The Mn(II/III) redox couple shows irreversible behaviour with large peak potential separations and small peak current ratios. A density functional theory (DFT) study shows the unstable oxidized Mn(III) complex to be either a high spin Jahn-Teller distorted ( S = 2) or an intermediate spin ( S = 1) species. Geometry distortion or electron rearrangement upon oxidation provides possible reasons for the observed irreversible electrochemical behaviour of the Mn(II/III) redox couple. A linear relationship obtained between the DFT calculated solvent phase (acetonitrile) highest molecular orbital energies and experimental reduction potentials (1/2(Epa + Epc) - obtained experimentally in acetonitrile for complexes 1 -7 in this study) were used to predict the experimental reduction potentials of related complexes (1/2(Epa + Epc) of complexes 8 -10 (previously published) accurately within 0.04 V of the published data. (c) 2021 Elsevier Ltd. All rights reserved.

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