Multielectron redox processes in polymeric cobalt complexes with N2O2 Schiff base ligands

Maria Novozhilova, Evgenia Smirnova, Julia Polozhentseva, Julia Danilova, Irina Chepurnaya, Mikhail Karushev, Валерий Вениаминович Малев, Alexander Timonov

Research outputpeer-review

2 Citations (Scopus)

Abstract

A series of polymeric cobalt (II) complexes with tetradentate N2O2 Schiff base ligands (poly-[Co(Schiff)]) are prepared via oxidative electrochemical polymerization and characterized by scanning electron microscopy, cyclic voltammetry, quartz crystal microgravimetry, and in situ UV/Vis spectroscopy in inert atmosphere. Integration of data from all techniques revealed that (a) all studied poly-[Co(Schiff)] films demonstrate multi-electron redox switching between 0 V and +1.4 V (vs. Ag/AgCl); (b) the Co(II) to Co(III) conversion takes place in the early stage of polymer oxidation, which is followed by both one- and two-electron ligand-based redox processes in the later stages; (c) the number of electrons exchanged by each monomer unit during oxidation/reduction of the polymer depends on the substituents in the imine bridge and aldehyde moieties of the ligand, as well as on the donor number of the electrolyte solvent. The poly-[Co(CH3O-SaltmEn)] film demonstrates the ability to be reversibly oxidized by three electrons per a monomer unit in an acetonitrile-based electrolyte, which makes it a viable candidate for energy storage applications.
Original languageEnglish
Pages (from-to)105
Number of pages11
JournalElectrochimica Acta
DOIs
Publication statusPublished - 6 Jun 2018

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Schiff Bases
Cobalt
Ligands
Electrons
Electrolytes
Polymers
Monomers
Quartz
Imines
Electropolymerization
Ultraviolet spectroscopy
Aldehydes
Acetonitrile
Energy storage
Cyclic voltammetry
Oxidation-Reduction
Oxidation
Crystals
Scanning electron microscopy

Cite this

Novozhilova, M., Smirnova, E., Polozhentseva, J., Danilova, J., Chepurnaya, I., Karushev, M., ... Timonov, A. (2018). Multielectron redox processes in polymeric cobalt complexes with N2O2 Schiff base ligands. Electrochimica Acta, 105. https://doi.org/10.1016/j.electacta.2018.06.030
Novozhilova, Maria ; Smirnova, Evgenia ; Polozhentseva, Julia ; Danilova, Julia ; Chepurnaya, Irina ; Karushev, Mikhail ; Малев, Валерий Вениаминович ; Timonov, Alexander. / Multielectron redox processes in polymeric cobalt complexes with N2O2 Schiff base ligands. In: Electrochimica Acta. 2018 ; pp. 105.
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abstract = "A series of polymeric cobalt (II) complexes with tetradentate N2O2 Schiff base ligands (poly-[Co(Schiff)]) are prepared via oxidative electrochemical polymerization and characterized by scanning electron microscopy, cyclic voltammetry, quartz crystal microgravimetry, and in situ UV/Vis spectroscopy in inert atmosphere. Integration of data from all techniques revealed that (a) all studied poly-[Co(Schiff)] films demonstrate multi-electron redox switching between 0 V and +1.4 V (vs. Ag/AgCl); (b) the Co(II) to Co(III) conversion takes place in the early stage of polymer oxidation, which is followed by both one- and two-electron ligand-based redox processes in the later stages; (c) the number of electrons exchanged by each monomer unit during oxidation/reduction of the polymer depends on the substituents in the imine bridge and aldehyde moieties of the ligand, as well as on the donor number of the electrolyte solvent. The poly-[Co(CH3O-SaltmEn)] film demonstrates the ability to be reversibly oxidized by three electrons per a monomer unit in an acetonitrile-based electrolyte, which makes it a viable candidate for energy storage applications.",
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Novozhilova, M, Smirnova, E, Polozhentseva, J, Danilova, J, Chepurnaya, I, Karushev, M, Малев, ВВ & Timonov, A 2018, 'Multielectron redox processes in polymeric cobalt complexes with N2O2 Schiff base ligands', Electrochimica Acta, pp. 105. https://doi.org/10.1016/j.electacta.2018.06.030

Multielectron redox processes in polymeric cobalt complexes with N2O2 Schiff base ligands. / Novozhilova, Maria; Smirnova, Evgenia; Polozhentseva, Julia; Danilova, Julia; Chepurnaya, Irina; Karushev, Mikhail; Малев, Валерий Вениаминович; Timonov, Alexander.

In: Electrochimica Acta, 06.06.2018, p. 105.

Research outputpeer-review

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T1 - Multielectron redox processes in polymeric cobalt complexes with N2O2 Schiff base ligands

AU - Novozhilova, Maria

AU - Smirnova, Evgenia

AU - Polozhentseva, Julia

AU - Danilova, Julia

AU - Chepurnaya, Irina

AU - Karushev, Mikhail

AU - Малев, Валерий Вениаминович

AU - Timonov, Alexander

PY - 2018/6/6

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N2 - A series of polymeric cobalt (II) complexes with tetradentate N2O2 Schiff base ligands (poly-[Co(Schiff)]) are prepared via oxidative electrochemical polymerization and characterized by scanning electron microscopy, cyclic voltammetry, quartz crystal microgravimetry, and in situ UV/Vis spectroscopy in inert atmosphere. Integration of data from all techniques revealed that (a) all studied poly-[Co(Schiff)] films demonstrate multi-electron redox switching between 0 V and +1.4 V (vs. Ag/AgCl); (b) the Co(II) to Co(III) conversion takes place in the early stage of polymer oxidation, which is followed by both one- and two-electron ligand-based redox processes in the later stages; (c) the number of electrons exchanged by each monomer unit during oxidation/reduction of the polymer depends on the substituents in the imine bridge and aldehyde moieties of the ligand, as well as on the donor number of the electrolyte solvent. The poly-[Co(CH3O-SaltmEn)] film demonstrates the ability to be reversibly oxidized by three electrons per a monomer unit in an acetonitrile-based electrolyte, which makes it a viable candidate for energy storage applications.

AB - A series of polymeric cobalt (II) complexes with tetradentate N2O2 Schiff base ligands (poly-[Co(Schiff)]) are prepared via oxidative electrochemical polymerization and characterized by scanning electron microscopy, cyclic voltammetry, quartz crystal microgravimetry, and in situ UV/Vis spectroscopy in inert atmosphere. Integration of data from all techniques revealed that (a) all studied poly-[Co(Schiff)] films demonstrate multi-electron redox switching between 0 V and +1.4 V (vs. Ag/AgCl); (b) the Co(II) to Co(III) conversion takes place in the early stage of polymer oxidation, which is followed by both one- and two-electron ligand-based redox processes in the later stages; (c) the number of electrons exchanged by each monomer unit during oxidation/reduction of the polymer depends on the substituents in the imine bridge and aldehyde moieties of the ligand, as well as on the donor number of the electrolyte solvent. The poly-[Co(CH3O-SaltmEn)] film demonstrates the ability to be reversibly oxidized by three electrons per a monomer unit in an acetonitrile-based electrolyte, which makes it a viable candidate for energy storage applications.

U2 - 10.1016/j.electacta.2018.06.030

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JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

ER -

Novozhilova M, Smirnova E, Polozhentseva J, Danilova J, Chepurnaya I, Karushev M et al. Multielectron redox processes in polymeric cobalt complexes with N2O2 Schiff base ligands. Electrochimica Acta. 2018 Jun 6;105. https://doi.org/10.1016/j.electacta.2018.06.030