Electrochemical studies of cobalt(II) diphenylazodioxide complexes

Balaraman, Lakshmi; Emhoff, Kylin A.; Salem, Ahmed M.; Hanna, Jovana; Alsabony, Mohamed N.; Bayachou, Mekki; Mundell, Joseph J.; Boyd, W. Christopher

doi:10.1016/j.ica.2019.119277

Cited by 5 publications

(4 citation statements)

References 40 publications

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“…The presence of shoulders could be possibly due to the dissociation equilibrium associated with the analyte solutions during the electrochemical studies. 30 Table 1 summarizes the significant peaks observed in complexes 1 and 2 , respectively. Similar cases of cobalt complexes bearing a quinoline moiety have been recently reported by some research groups.…”

Section: Resultsmentioning

confidence: 99%

Electrocatalytic proton reduction by dinuclear cobalt complexes in a nonaqueous electrolyte

Raj

Padhi

2022

New J. Chem.

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Section: Resultsmentioning

confidence: 99%

Electrocatalytic proton reduction by dinuclear cobalt complexes in a nonaqueous electrolyte

Raj

Padhi

2022

New J. Chem.

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“…Furthermore, the anodic and cathodic current ratios ( i p,a / i p,c ) were appeared close to unity, which signifies a diffusion controlled reversible electrode reactions. [ 31 ] The high similarity in the cyclic voltammogram of two complexes points to similarity in their structures, which really appeared. Also, the results resemble to that previously reported.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical synthesis for new thiosemicarbazide complexes, spectroscopy, cyclic voltammetry, structural properties, and in silico study

Refat

El‐Metwaly

Yamany

et al. 2020

Applied Organom Chemis

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A new thiosemicarbazide derivative ligand (HDCTS) was prepared from the reaction between 2,4-dinitrophenylhydrazine and 4-chlorophenyl isothiocyanate. Co(II) and Cu(II) complexes were synthesized from HDCTS derivative by electrochemical method to reach preferable yield in a safe environment. The new complexes as well as the original ligand were fully characterized to establish their chemical formulae. The spectral (infrared, Raman, mass, and ultraviolet-visible), analytical (elemental, thermogravimetric analysis [TGA], and cyclic voltammetry), and conformational techniques were implemented for characterization. According to spectral data and magnetic moments, the octahedral arrangement was proposed around metals through mono-negative bidentate mode of bonding. TGA discriminates and quantitatively evaluates the presence of water molecules within two complexes. Electrochemical study was interested for all new compounds and suggests the electrode couples to be close for quasi-reversible behavior. Elaborated conformational study was displayed to extract significant characteristics, which assert firstly on the mode of bonding inside the complexes. The perfect distribution of NH and CS groups inside the optimized structures facilitates their coordination as spectrally proposed. Crystal explorer program was used to investigate the degree of contact between molecules inside crystal packing systems. Effective contribution in surface contact feature was noticed from O and Cl atoms. A certified in silico study concerning the docking feature of new compounds against effective proteins in allergy and inflammation diseases was done. According to data exported, a promising anti-allergic or anti-inflammatory efficiency is expected strongly from Cu(II)-DCTS complex.

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“…Furthermore, a shoulder positioned at −1.27 V vs SCE was also observed, which was suggested due to an unstable reduced species in the electrochemical scale. 28,29 Meanwhile, two reduction peak was exhibited by ligand hbqc at E pc = −1.47 V and E 1/2 = −1.85 V vs SCE (Figure 4C). On the other hand, under the same electrochemical condition, the cyclic voltammogram of complex Co-NO 2 was similar to Co-Cl displaying a quasi-reversible system of Co III Co III /Co II Co II transition wave (E 1/2 ) at 0.44 V vs SCE.…”

Section: ■ Results and Discussionmentioning

confidence: 64%

“…Additionally, these observations propose the lowly interaction between the two metal centers through the ligand scaffold. Furthermore, a shoulder positioned at −1.27 V vs SCE was also observed, which was suggested due to an unstable reduced species in the electrochemical scale. , …”

Section: Resultsmentioning

confidence: 91%

Ligand-Mediated Hydrogen Evolution by Co(II) Complexes and Assessment of the Mechanism by Computational Studies

et al. 2023

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In this work, two novel dinuclear cobalt complexes, [Co II (hbqc)-(H 2 O)] 2 (Co-Cl) and [Co II (hbqn)(H 2 O)] 2 (Co-NO 2 ), featuring benzimidazole derived redox-active ligand have been synthesized to investigate their catalytic activities toward electrocatalytic proton reduction (where hbqc is 2. The electrochemical responses in 95/5 (v/v) DMF/H 2 O with the addition of 24 equiv of AcOH as a proton source manifest high catalytic activity for proton reduction to H 2 . The catalytic reduction event yields H 2 at an applied potential of −1.9 V vs SCE. A faradaic efficiency of 85−89% was obtained from gas chromatography analysis. A series of experiments performed concluded the homogeneous behavior of these molecular electrocatalysts. Between the two complexes, the Cl-substituted analogue, Co-Cl, has an increased overpotential of 80 mV compared to its NO 2 -substituted counterpart, exhibiting lesser catalytic activity toward the reduction process. The high stability of electrocatalysts under the electrocatalytic conditions was established, as no noticeable degradation of catalysts was observed throughout the process. All these measurements were exploited to elucidate the mechanistic route by these molecular complexes for the reduction process. The mechanistic pathways were suggested to be operational with EECC (E: electrochemical and C: chemical). The overall reaction energy by NO 2 -substituted Co-NO 2 -catalyzed reaction is more exogenic than Cl-substituted Co-Cl-catalyzed reaction; the corresponding reaction energies are −88.9 and −85.1 kcal mol −1 . The computational study indicates that Co-NO 2 is more efficient toward molecular hydrogen formation reaction than Co-Cl.

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Electrochemical studies of cobalt(II) diphenylazodioxide complexes

Cited by 5 publications

References 40 publications

Electrocatalytic proton reduction by dinuclear cobalt complexes in a nonaqueous electrolyte

Electrocatalytic proton reduction by dinuclear cobalt complexes in a nonaqueous electrolyte

Electrochemical synthesis for new thiosemicarbazide complexes, spectroscopy, cyclic voltammetry, structural properties, and in silico study

Ligand-Mediated Hydrogen Evolution by Co(II) Complexes and Assessment of the Mechanism by Computational Studies

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