Structural and electronic characterization of multi-electron reduced naphthalene (BIAN) cobaloximes

Williams, Owen M.; Cowley, Alan H.; Rose, Michael J.

doi:10.1039/c5dt00924c

Cited by 18 publications

(11 citation statements)

References 61 publications

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“…In 2015, a boron bridged BIAN(Bis(imino)acenaphthene) based cobaloxime ( 32 ) and the complex was reported by Williams et al [40] and the structure of the complex was confirmed by spectroscopic techniques. The IR of the complex showed a characteristic peak at 3603 and 3530 cm −1 for N−H and O−H respectively, 1623 for C=N, 1484, 1416, 1134 cm −1 for C=C.…”

Section: Spectroscopic Characterization Of Cobaloximesmentioning

confidence: 93%

“…The weaker benzoic acid also revealed same increase in current similar to strong acid TsOH. The linear plot of the scan rate against peak current revealed that the process was diffusion controlled [40] …”

Section: Electrochemistry and Electrocatalytic Activity Of Cobaloximesmentioning

confidence: 98%

“…In UV-Vis spectra a peak at 249 nm was observed respective to π-π* transition of the pyridine containing phosphonate group. Douli et al in 2019 [46] synthesized a series of cobaloxime containing natural amino acids like phenylalanine and tyrosine and their decarboxylated derivatives such as benzylamine and tyramine (39)(40)(41)(42) were attached to axial pyridine through a methylene linker. This method enabled authors to synthesize different water soluble cobaloximes.…”

Section: Spectroscopic Characterization Of Cobaloximesmentioning

confidence: 99%

“…The linear plot of the scan rate against peak current revealed that the process was diffusion controlled. [40] Rountree et al, in 2016 [41] performed kinetic analysis of hydrogen production catalyzed by Co(dmgBF 2 ) 2 (CH 3 CN) 2 (33). The CV of the complex showed a reversible one electron reduction process of Co(II)/Co(I) and an irreversible peak attributed to Co(III)/Co(II).…”

Section: Electrochemistry and Electrocatalytic Activity Of Cobaloximesmentioning

confidence: 99%

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Electrochemistry and Electrocatalytic Activity of Cobaloxime Complexes

Subramanian

Vijaikanth

2022

ChemistrySelect

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Development of clean and renewable energy sources has emerged as one of the major interests due to the environmental issues caused by the fossil fuels. Presently a huge amount of interest has been devoted in developing the cost effective alternative energy sources and hydrogen gas has been considered as one of the substitutes for fossil fuels. Initially noble metals like Platinum was employed as a catalyst for hydrogen generation but they are costly. So, recently first row transition metal based catalysts have been utilized for the production of hydrogen gas since these metals are cost effective and earth copious. Among the first row transition metal catalysts, cobalt complexes in particular cobaloximes have been given importance as capable catalysts for hydrogen production. This review discusses about the recent advances in the electrochemistry and the various approaches employed towards the attachment of the cobaloxime complexes on the electrode surface and their electrocatalytic behaviour.

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Section: Spectroscopic Characterization Of Cobaloximesmentioning

confidence: 93%

Section: Electrochemistry and Electrocatalytic Activity Of Cobaloximesmentioning

confidence: 98%

Section: Spectroscopic Characterization Of Cobaloximesmentioning

confidence: 99%

Section: Electrochemistry and Electrocatalytic Activity Of Cobaloximesmentioning

confidence: 99%

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Electrochemistry and Electrocatalytic Activity of Cobaloxime Complexes

Subramanian

Vijaikanth

2022

ChemistrySelect

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“…[43][44][45] The redox lability of the Co-BIAN moiety, in particular, has led to its use in numerous catalytic applications. [46][47][48][49][50] While VT has not been observed experimentally in Co-BIAN systems, 24,51 its occurrence in three complexes with the general formula [Co(L NO ) 2 (BIAN)] (L NO = a Schiff base ligand, Chart S1 †) has been computationally predicted, involving an interconversion between low-spin (LS) Co III -BIAN •− and high-spin (HS) Co II -BIAN 0 forms. 52 However, the calculated [Co(L NO ) 2 (BIAN)] complexes are difficult to access experimentally as they each contain either an ancillary ligand that cannot be isolated because it self-reacts and/or a BIAN ligand that has never been reported.…”

Section: Introductionmentioning

confidence: 99%

Rich redox-activity and solvatochromism in a family of heteroleptic cobalt complexes

et al. 2021

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An oxo‐acetato‐bridged trinuclear cobalt(III) cluster‐persuaded cobalt oxide active electrocatalyst for efficient hydrogen evolution activity

Sarkar,

Diyali,

Mondal

et al. 2024

Applied Organom Chemis

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This study presents the synthesis and electrocatalytic performance of the cobalt(III) complex [Co3(μ1,1,1‐O)(μ1,3‐CH3CO2)(L)3]2(DMF)3 (Cotri), featuring a double deprotonated (N,O)‐donor ligand (L2‐), where the protonated form of it (H2L) is 2,2′‐(hydrazine‐1,2‐diylidenebis(ethan‐1‐yl‐1‐ylidene))diphenol. The X‐ray structure reveals a trinuclear cobalt cluster formed with three cobalt(III) centers interlinking through oxido (μ1,1,1‐O) and acetato (μ1,3‐O2CCH3) bridges in coupling with bis‐congregator‐type chelating ligands. Cotri adopts cobalt centers of octahedral and trigonal bipyramidal coordination geometries and bears a dominant Co(2)…H(DMF) agostic interactions appraised by lattice dimethyl formamide (DMF) molecules. Further, Cotri shows promising heterogeneous electrocatalytic hydrogen evolution activity in 1 M KOH, with an overpotential of 441 mV to achieve 10 mA/cm2 current density. Tafel slope analysis suggests the Volmer–Heyrovsky step as the rate‐determining step. The number of active sites and TOF for Cotri were estimated at 4.010 × 10−8 mol and 0.2467 s−1, respectively, ensuring its excellent hydrogen generation activity. Stability assessments through controlled potential electrolysis (CPE) and cyclic voltammetry (CV) for multiple cycles addressed the transformation of Cotri to Co2O3 nanoparticles, which turned out to be a more active Co2O3 electrocatalyst. The morphology and particle size of the in situ developed Co2O3 active catalyst under the electrochemical conditions attributes to the superior hydrogen evolution activity.

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Structural and electronic characterization of multi-electron reduced naphthalene (BIAN) cobaloximes

Cited by 18 publications

References 61 publications

Electrochemistry and Electrocatalytic Activity of Cobaloxime Complexes

Electrochemistry and Electrocatalytic Activity of Cobaloxime Complexes

Rich redox-activity and solvatochromism in a family of heteroleptic cobalt complexes

An oxo‐acetato‐bridged trinuclear cobalt(III) cluster‐persuaded cobalt oxide active electrocatalyst for efficient hydrogen evolution activity

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