Evaluation of Manganese Cubanoid Clusters for Water Oxidation Catalysis: From Well-Defined Molecular Coordination Complexes to Catalytically Active Amorphous Films

Hosseinmardi S, Scheurer A, Heinemann FW, Kuepper K, Senft L, Waldschmidt P, Ivanovic-Burmazovic I, Meyer K (2021)

Publication Type: Journal article, Original article

Publication year: 2021

Journal

Chemsuschem Wiley-VCH Verlag

DOI: 10.1002/cssc.202101451

Abstract

With a view to developing multimetallic molecular catalysts that mimic the oxygen-evolving catalyst (OEC) in Nature's photosystem II, the synthesis of various dicubanoid manganese clusters is described and their catalytic activity investigated for water oxidation in basic, aqueous solution. Pyridinemethanol-based ligands are known to support polynuclear and cubanoid structures in manganese coordination chemistry. The chelators 2,6-pyridinedimethanol (H2L1) and 6-methyl-2-pyridinemethanol (HL2) were chosen to yield polynuclear manganese complexes; namely, the tetranuclear defective dicubanes [MnII2MnIII2(HL1)4(OAc)4(OMe)2] and [MnII2MnIII2(HL1)6(OAc)2] (OAc)2⋅2 H2O, as well as the octanuclear-dicubanoid [MnII6MnIII2(L2)4(O)2(OAc)10(HOMe/OH2)2]⋅3MeOH⋅MeCN. In freshly prepared solutions, polynuclear species were detected by electrospray ionization mass spectrometry, whereas X-band electron paramagnetic resonance studies in dilute, liquid solution suggested the presence of divalent mononuclear Mn species with g values of 2. However, the magnetochemical investigation of the complexes’ solutions by the Evans technique confirmed a haphazard combination of manganese coordination complexes, from mononuclear to polynuclear species. Subsequently, the newly synthesized and characterized manganese molecular complexes were employed as precursors to prepare electrode-deposited films in a buffer-free solution to evaluate and compare their stability and catalytic activity for water oxidation electrocatalysis.

Authors with CRIS profile

Soosan Hosseinmardi Lehrstuhl für Anorganische und Allgemeine Chemie Andreas Scheurer Lehrstuhl für Anorganische und Allgemeine Chemie Frank Wilhelm Heinemann Lehrstuhl für Anorganische und Allgemeine Chemie Laura Senft Lehrstuhl für Anorganische und Allgemeine Chemie Pablo Waldschmidt Lehrstuhl für Anorganische und Allgemeine Chemie Ivana Ivanovic-Burmazovic Lehrstuhl für Bioanorganische Chemie Karsten Meyer Lehrstuhl für Anorganische und Allgemeine Chemie

Involved external institutions

Universität Osnabrück DE Germany (DE)

How to cite

APA:

Hosseinmardi, S., Scheurer, A., Heinemann, F.W., Kuepper, K., Senft, L., Waldschmidt, P.,... Meyer, K. (2021). Evaluation of Manganese Cubanoid Clusters for Water Oxidation Catalysis: From Well-Defined Molecular Coordination Complexes to Catalytically Active Amorphous Films. Chemsuschem. https://doi.org/10.1002/cssc.202101451

MLA:

Hosseinmardi, Soosan, et al. "Evaluation of Manganese Cubanoid Clusters for Water Oxidation Catalysis: From Well-Defined Molecular Coordination Complexes to Catalytically Active Amorphous Films." Chemsuschem (2021).

BibTeX: Download