Cobalt(III) complexes containing incomplete C3O4 or complete Co4O4 cubane core

Ama, Tomoharu; Rashid, M.-D. M.; Yonemura, Toshiaki; Kawaguchi, Hiroshi; Yasui, Takaji

doi:10.1016/s0010-8545(99)00193-9

Cited by 43 publications

(30 citation statements)

References 37 publications

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“…Reduced distances in this range are characteristic of layered oxides and have been observed in other cobalt oxide electrocatalysts indicating the presence of di-μ-oxo bridges. 39,40 Absence of this peak for films with greater Ti content indicates minimal structural order.…”

Section: Figure 2 Herementioning

confidence: 99%

Tuning Composition and Activity of Cobalt Titanium Oxide Catalysts for the Oxygen Evolution Reaction

Seitz

Nordlund

Gallo

et al. 2016

Electrochimica Acta

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Understanding catalyst function to improve activity for the oxygen evolution reaction (OER) is key to increasing the overall efficiency of electrochemical water splitting, a promising method for sustainable and clean production of hydrogen. Using a straightforward and scalable sol-gel synthesis, we explore the effects of metal composition in Co x Ti 1-x O y on electrochemical activity, atomic structure, and electronic state. Physical and electronic characterization reveal that increased amounts of Ti stabilize the 2+ oxidation state of the Co precursor and lead to formation of less active CoO-like catalysts. Conversely, films with Co:Ti ratios of 1:1 or greater result in catalysts with high activity, correlating with greater Co 3+ character, as measured by ex situ XAS for samples as-prepared and after exposure to OER conditions. Additionally,

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Section: Figure 2 Herementioning

confidence: 99%

Tuning Composition and Activity of Cobalt Titanium Oxide Catalysts for the Oxygen Evolution Reaction

Seitz

Nordlund

Gallo

et al. 2016

Electrochimica Acta

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“…These distances are characteristic of edge-sharing octahedra in layered oxides, such as Li x CoO 2 [67], Na x CoO 2 [68], H x CoO 2 [69], and complexes with cubane cores, such as Co 4 ( -O) 4 [70][71][72]. The reported number of Co ions neighboring the X-ray-absorbing Co ion ranges between 3.3 and 5.3 [5,63,64], which implies the presence of only a few interconnected incomplete or complete cubane units (Co 3∕4 ( -O) 4 ; see Figure 9.2b).…”

Section: Structure and Structure-function Relationsmentioning

confidence: 99%

Water Oxidation by Co‐Based Oxides with Molecular Properties

Risch

Klingan

Zaharieva

et al. 2014

Molecular Water Oxidation Catalysis

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“…For tetrametallic clusters, one familiar motif is defect‐dicubane. It may be mentioned that there are a number of defect‐dicubane compounds having only 3d metal ions,[3b], [3c], [3d], [3e], [3f], [3g], only 4f metal ions[8e] and both 3d and 4f metal ions …”

Section: Introductionmentioning

confidence: 99%

“…The choice or design of ligands and self‐assembling[3h], [3i] are crucial for stabilizing clusters, , (as well as coordination polymers, CPs, ). The symmetric two‐compartmental Schiff base ligands (like H 3 L; two O(alcohol)N(imine)O(phenol) sites; Scheme ) that are obtained from [1+2] condensation of a 4‐R‐2,6‐diformylphenol (R = Me, Et, n ‐butyl, tert ‐butyl, Cl, CF 3 , etc.)…”

Section: Introductionmentioning

confidence: 99%

Syntheses, Crystal Structures, and Magnetic Properties of a Series of Defect‐Dicubane Tetranickel(II) Systems with Variable, Mixed, and Interchangeable µ₃‐Core Ligands

2019

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The article describes syntheses, crystal structures and magnetic properties of six defective dicubane type Ni II 4 clusters of compositions [Ni II 4 (HL 1 ) 2 (μ 3 -X) 2 (μ 1,1 -N 3 ) 2 (μ 1,3 -carboxylato) 2 ]· nH 2 O (1, X = OMe -, carboxylato = o-benzoylbenzoato, n = 0; 2, X = {(OMe -) 0.83 (N 3 -) 0.17 }, carboxylato = phenyl acetato, n = 2; 3, (6), where H 2 L 1 is 2-Formyl-6-{(2-hydroxy-1,1-dimethyl-ethylimino)-methyl}-4ethyl-phenol, and this is the partially hydrolyzed product of initially employed ligand H 3 L, 2,6-bis-{(2-hydroxy-1,1-dimethyl- [a] Scheme 2. General schematic illustration of synthetic procedure for all the complexes 1-6.Scheme 3. Schematic representation of solvent-dependent and both-way interconversion between 1 and 4. sorption of strong intensity in the range of 1619-1633 cm -1 , which can be assigned to, respectively, aldehyde C=O and imine C=N stretchings. Symmetric and asymmetric stretchings of μ 1,3carboxylato ligands in 1-5 appear as bands of medium inten-Eur. J. Inorg. Chem. 2019, 4625-4636 www.eurjic.org 4627 sity in the ranges, respectively, 1557-1585 cm -1 and 1380-1409 cm -1 . The O-H stretchings of water (in 2, 5 and 6) or of water and hydroxo (in 4) appear as a broad band with the center lying in the range of 3416-3451 cm -1 . 4634 romagnetic in these three compounds (J 1 = -1.16, -7.33 and -5.59 cm -1 , respectively).

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Cobalt(III) complexes containing incomplete C3O4 or complete Co4O4 cubane core

Cited by 43 publications

References 37 publications

Tuning Composition and Activity of Cobalt Titanium Oxide Catalysts for the Oxygen Evolution Reaction

Tuning Composition and Activity of Cobalt Titanium Oxide Catalysts for the Oxygen Evolution Reaction

Water Oxidation by Co‐Based Oxides with Molecular Properties

Syntheses, Crystal Structures, and Magnetic Properties of a Series of Defect‐Dicubane Tetranickel(II) Systems with Variable, Mixed, and Interchangeable µ₃‐Core Ligands

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Cobalt(III) complexes containing incomplete C3O4 or complete Co4O4 cubane core

Cited by 43 publications

References 37 publications

Tuning Composition and Activity of Cobalt Titanium Oxide Catalysts for the Oxygen Evolution Reaction

Tuning Composition and Activity of Cobalt Titanium Oxide Catalysts for the Oxygen Evolution Reaction

Water Oxidation by Co‐Based Oxides with Molecular Properties

Syntheses, Crystal Structures, and Magnetic Properties of a Series of Defect‐Dicubane Tetranickel(II) Systems with Variable, Mixed, and Interchangeable µ3‐Core Ligands

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Syntheses, Crystal Structures, and Magnetic Properties of a Series of Defect‐Dicubane Tetranickel(II) Systems with Variable, Mixed, and Interchangeable µ₃‐Core Ligands