Electrocatalytic hydrogen production activity with a copper(<scp>ii</scp>)-dipyridylamine complex in acidic water

Diyali, Nilankar; Chettri, Meena; Saha, Subhajit; Saha, Ankita; Kundu, Subhankar; Mondal, Debasish; Dhak, Debasis; Biswas, Bhaskar

doi:10.1039/d3ce00996c

Cited by 7 publications

(1 citation statement)

References 67 publications

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“…The formation of the copper complex was also assessed by ESI-MS measurement of the probe in the presence of Cu 2+ ions in water. 75,76 The presence of a distinct molecular ion peak at m / z 464.6304 was observed for the Cu 2+ complex, [Cu( 1 ) 2 ] 2+ while the probe showed a base peak at m / z 433.2207 for 1 -H + (Fig. 8a, ESI†).…”

Section: Resultsmentioning

confidence: 99%

AIE active fluorescent organic nanoparticles based optical detection of Cu²⁺ ions in pure water: a case of aggregation–disaggregation reversibility

Saha,

Paul,

Debnath

et al. 2024

Anal. Methods

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Section: Resultsmentioning

confidence: 99%

AIE active fluorescent organic nanoparticles based optical detection of Cu²⁺ ions in pure water: a case of aggregation–disaggregation reversibility

Saha,

Paul,

Debnath

et al. 2024

Anal. Methods

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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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Copper (II) complexes based on the mixed ligand system: Study of synthesis, characterization, and stopped‐flow kinetics of copper oxidase‐mimicking catalytic activity

Abo El‐Kheir,

Shaban,

Ibrahim

et al. 2024

Applied Organom Chemis

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Two copper (II) complexes based on the mixed ligand system were synthesized and structurally characterized. The molecular formulae for complex (1), [Cu2L1L′] and complex (2), [CuL2L′] were determined based on analytical data, molar conductance, and thermal analysis results. The optimized structures of complexes (1) and (2) were determined by magnetic and spectroscopic measurements (FTIR, UV–Vis, and ESR) and confirmed by processing powder X‐ray diffraction data by Expo 2014 software. The geometry index (τ5), determined by ESR spectra and structural analysis based on powder X‐ray, demonstrates the square pyramidal geometry of the Cu (II) center of [Cu2L1L′] and [CuL2L′]. Cyclic voltammetry measurements were performed to elucidate the relationship between the redox properties of (1) and (2) and their oxidase‐mimicking catalytic activity. Catalytic aerobic oxidation of the polyphenols 3,5‐di‐tert‐butylcatechol (3,5‐DTBCH2), 4‐nitrocatechol, and 2‐aminophenol (2‐APH3) was studied by stopped‐flow technique. Promising catechol oxidase (COX) and phenoxazinone synthase (PHS) mimetic activity have been demonstrated for (1) and (2). Electrochemical data were used to determine the free energy (ΔG°) or driving force (−λ), and their correlation with the oxidase mimetic activity of(1) and (2) was examined. Several experimental procedures have been performed that have helped describe the catalytic mechanisms of the catalytic reactions taking place.

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Electrocatalytic hydrogen production activity with a copper(ii)-dipyridylamine complex in acidic water

Abstract: A water-stable and structurally-characterized earth-abundant copper(II) complex, [Cu(dpa)2(N3)]Cl.4H2O containing an N,N-chelator, (dpa = 2,2'-dipyridylamine) and an ancillary ligand (N3- =azide ion) has been synthesized and evaluated for electrocatalytic H2 production...

Cited by 7 publications

References 67 publications

AIE active fluorescent organic nanoparticles based optical detection of Cu²⁺ ions in pure water: a case of aggregation–disaggregation reversibility

AIE active fluorescent organic nanoparticles based optical detection of Cu²⁺ ions in pure water: a case of aggregation–disaggregation reversibility

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

Copper (II) complexes based on the mixed ligand system: Study of synthesis, characterization, and stopped‐flow kinetics of copper oxidase‐mimicking catalytic activity

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Electrocatalytic hydrogen production activity with a copper(ii)-dipyridylamine complex in acidic water

Abstract: A water-stable and structurally-characterized earth-abundant copper(II) complex, [Cu(dpa)2(N3)]Cl.4H2O containing an N,N-chelator, (dpa = 2,2'-dipyridylamine) and an ancillary ligand (N3- =azide ion) has been synthesized and evaluated for electrocatalytic H2 production...

Cited by 7 publications

References 67 publications

AIE active fluorescent organic nanoparticles based optical detection of Cu2+ ions in pure water: a case of aggregation–disaggregation reversibility

AIE active fluorescent organic nanoparticles based optical detection of Cu2+ ions in pure water: a case of aggregation–disaggregation reversibility

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

Copper (II) complexes based on the mixed ligand system: Study of synthesis, characterization, and stopped‐flow kinetics of copper oxidase‐mimicking catalytic activity

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AIE active fluorescent organic nanoparticles based optical detection of Cu²⁺ ions in pure water: a case of aggregation–disaggregation reversibility

AIE active fluorescent organic nanoparticles based optical detection of Cu²⁺ ions in pure water: a case of aggregation–disaggregation reversibility