Electrochemical water oxidation using a stable water-soluble mononuclear manganese clathrochelate

Zheng, Shenke; Liang, Xiangming; Dai, Chang; Yang, Xueli; Li, Ziyang; Lai, Yuxiong; Li, Hong; Lin, Junqi

doi:10.1039/d3nj02085a

Cited by 3 publications

(2 citation statements)

References 58 publications

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“…However, anionic donors are not strictly necessary, as evidenced by the report from Smith of a dicationic mononuclear manganese pyridinophane complex (Figure 2C) that is effective in electrocatalytic water oxidation (TON = 16-24) [23]. Scattered examples of other mononuclear manganese complexes that are competent precatalysts for electrocatalytic water oxidation, often supported by poly-dentate nitrogen donor ligands, have been reported in the last few years, although in some cases, the nature of the active catalyst in the system is not yet clear [24][25][26][27].…”

Section: Introductionmentioning

confidence: 91%

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Synthesis and Characterization of Bipyridyl-(Imidazole)n Mn(II) Compounds and Their Evaluation as Potential Precatalysts for Water Oxidation

Mu,

Gaynor,

McIntyre

et al. 2023

Molecules

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Metalloenzymes make extensive use of manganese centers for oxidative catalysis, including water oxidation; the need to develop improved synthetic catalysts for these processes has long motivated the development of bioinspired manganese complexes. Herein, we report a series of bpy-(imidazole)n (n = 1 or 2) (bpy = 2,2′-bipyridyl) ligands and their Mn2+ complexes. Four Mn2+ complexes are structurally characterized using single-crystal X-ray diffraction, revealing different tridentate and tetradentate ligand coordination modes. Cyclic voltammetry of the complexes is consistent with ligand-centered reductions and metal-centered oxidations, and UV-vis spectroscopy complemented by TD-DFT calculations shows primarily ligand-centered transitions with minor contributions from charge-transfer type transitions at higher energies. In solution, ESI-MS studies provide evidence for ligand reorganization, suggesting complex speciation behavior. The oxidation of the complexes in the presence of water is probed using cyclic voltammetry, but the low stability of the complexes in aqueous solution leads to decomposition and precludes their ultimate application as aqueous electrocatalysts. Possible reasons for the low stability and suggestions for improvement are discussed.

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Section: Introductionmentioning

confidence: 91%

“…Molecules 2023, 28, x FOR PEER REVIEW 3 of 26 oxidation, often supported by polydentate nitrogen donor ligands, have been reported in the last few years, although in some cases, the nature of the active catalyst in the system is not yet clear [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Bipyridyl-(Imidazole)n Mn(II) Compounds and Their Evaluation as Potential Precatalysts for Water Oxidation

Mu,

Gaynor,

McIntyre

et al. 2023

Molecules

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Rational Design of Electrocatalysts for Water Oxidation Reaction: Inspiration from Photosystem II

Li,

Lang,

Liu

et al. 2023

ChemCatChem

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To address the ever‐increasing societal demand for clean energy, electrocatalytic water splitting has attracted considerable interest for the efficient production of H2 and O2. However, the oxygen evolution reaction (OER) is inherently sluggish and poses significant challenge to the overall water splitting process. As a result, extensive research efforts have been dedicated to pursuing various approaches in developing efficient electrocatalysts for water oxidation. The oxygen‐evolving center (OEC) of Photosystem II (PS II) is a natural model giving the prominent reference. Hence, this review discusses the recent advances in the design of artificial electrocatalyst inspired by PS II. The discussion begins with a brief introduction to the fundamentals of electrocatalytic water oxidation and PS II. Subsequently, the progress of the novel electrocatalysts inspired by PS II is presented in the following two aspects: engineering various transition metal clusters to mimic the inorganic metal cluster of OEC (Mn4O5Ca), and utilizing different ligands to simulate the protein and amino acid environment around [Mn4O5Ca]. In addition to outlying the structures, catalytic activity, and corresponding mechanisms of these prepared catalysts, this present review concludes by proposing several effective development perspectives to this emerging field that warrant further investigation.

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Earth abundant transition metal complexes as molecular water oxidation catalysts

Adnan Khan,

Khan,

Sengupta

et al. 2024

Coordination Chemistry Reviews

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Electrochemical water oxidation using a stable water-soluble mononuclear manganese clathrochelate

Abstract: A stable water-soluble mononuclear manganese clathrochelate complex [MnIV(L-6H)]2- is utilized as electrocatalyst for water oxidation in phosphate buffer solution at pH 8.0. Kinetic tests and electrochemical examinations reveal that this...

Cited by 3 publications

References 58 publications

Synthesis and Characterization of Bipyridyl-(Imidazole)n Mn(II) Compounds and Their Evaluation as Potential Precatalysts for Water Oxidation

Synthesis and Characterization of Bipyridyl-(Imidazole)n Mn(II) Compounds and Their Evaluation as Potential Precatalysts for Water Oxidation

Rational Design of Electrocatalysts for Water Oxidation Reaction: Inspiration from Photosystem II

Earth abundant transition metal complexes as molecular water oxidation catalysts

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