Electrocatalytic hydrogen production and carbon dioxide conversion by earth abundant transition metal complexes of the Schiff base ligand: (E)-1-((2-dimethylamino)-propylimino)methyl)naphthalene-2-ol

Sengupta, Swaraj; Khan, Sahanwaj; Mongal, Binitendra Naath; Lewis, William; Fleck, Michel; Chattopadhyay, Shyamal Kumar; Naskar, Subhendu

doi:10.1016/j.poly.2020.114798

Cited by 7 publications

(2 citation statements)

References 57 publications

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“…The crystal description of complex 3 is depicted in Table S1. In the crystal structure, 3 adopted a distorted square planar geometry (τ 4 = 0.221) where Cu is coordinated to two amidate nitrogen and two pyridine nitrogen atoms of the ligand. , The average Cu–N bond distances are 1.929–2.037 Å (Table S2).…”

Section: Resultsmentioning

confidence: 99%

Electrocatalytic Water Oxidation by Mononuclear Copper Complexes of Bis-amide Ligands with N4 Donor: Experimental and Theoretical Investigation

Khan,

Sengupta,

Khan

et al. 2024

Inorg. Chem.

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The present work describes electrocatalytic water oxidation of three monomeric copper complexes [Cu II (L1)] (1), [Cu II (L2)(H 2 O)] (2), and [Cu II (L3)] (3) with bis-amide tetradentate ligands:for the production of molecular oxygen by the oxidation of water at pH 13.0. Ligands and all complexes have been synthesized and characterized by single crystal XRD, analytical, and spectroscopic techniques. X-ray crystallographic data show that the ligand coordinates to copper in a dianionic fashion through deprotonation of two −NH protons. Cyclic voltammetry study shows a reversible copper-centered redox couple with one ligand-based oxidation event. The electrocatalytic water oxidation occurs at an onset potential of 1.16 (overpotential, η ≈ 697 mV), 1.2 (η ≈ 737 mV), and 1.23 V (η ≈ 767 mV) for 1, 2, and 3 respectively. A systematic variation of the ligand scaffold has been found to display a profound effect on the rate of electrocatalytic oxygen evolution. The results of the theoretical (density functional theory) studies show the stepwise ligand-centered oxidation process and the formation of the O−O bond during water oxidation passes through the water nucleophilic attack for all the copper complexes. At pH = 13, the turnover frequencies have been experimentally obtained as 88, 1462, and 10 s −1 (peak current measurements) for complexes 1, 2, and 3, respectively. Production of oxygen gas during controlled potential electrolysis was detected by gas chromatography.

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Section: Resultsmentioning

confidence: 99%

Electrocatalytic Water Oxidation by Mononuclear Copper Complexes of Bis-amide Ligands with N4 Donor: Experimental and Theoretical Investigation

Khan,

Sengupta,

Khan

et al. 2024

Inorg. Chem.

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“…The literature in which some metal complexes of Schiff bases are used as catalysts is expressed in thousands of publications in the last five years. These complex molecules are used as catalysts in many of these publications and have started to gain importance in industrial applications [1][2][3][4][5][6]. In addition to these application areas, these complexes have an important place in biological activities such as antibacterial, antifungal, and antitumor, analytical chemistry, paints, polymer stains, especially at low temperatures [13][14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of The Effects of Diaminopyridine and o-Vanillin Derivative Schiff Base Complexes of Mn(II), Mn(III), Co(II) and Zn(II) Metals on The Oxidative Bleaching Performance of H2O2

Uğur¹,

Tuna

2021

Sakarya University Journal of Science

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Catalytic applications are widely used in industrial and individual applications today due to their many advantages, especially the energy and time they provide. For this purpose, many coordination compounds have been synthesized, and their catalytic performances have been investigated in recent years. In this study, the Schiff base ligand, (N,N'-bis(2-hydroxy-3methoxyphenylmethylidene)-2,6-pyridinediamine, BHMP), was synthesized with 2,6diaminopyridine with o-vanillin. Mn(II), Mn(III), Co(II), Zn(II) complexes were obtained with the synthesized ligand. Spectroscopic methods such as FT-IR, 1 H-NMR, UV-vis, Mass, and melting point determination methods were used for the structure elucidation of the synthesized compounds. The performances of the obtained complexes as bleach catalysts, which are an important application area of Schiff base complexes, were investigated. According to the bleaching measurement results, the highest catalytic effect on the bleaching performance of H2O2 in pH 10.5 buffer at 25 °C under homogeneous conditions was obtained with Co(II) complex. It was understood that this complex was followed by Mn(II), Mn(III), and Zn(II) complexes, respectively.

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Ultrasonic high‐yield extraction of non‐toxic fucose‐containing Abroma augusta polysaccharide bearing emulsifying properties

Sarkhel,

Mondal,

Datta

et al. 2024

J Sci Food Agric

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BACKGROUNDThe stem of Abroma augusta contains mucilaginous polysaccharides having numerous ethnomedicinal properties. The present work aimed to develop a scalable ultrasonic‐assisted aqueous Abroma augusta mucilage (AAM) extraction (UAE) method and further explores its emulsifying property and toxicity concern.RESULTSThe combination of ultrasonic power (750 W), solid‐to‐liquid ratio (1:15) and temperature (348 K) gave the highest extraction yield of 2.28% with a diffusivity value of 3.85 × 10−9 m2 s−1, which was higher than aqueous extraction method using a kinetic model based on Fick's second law of diffusion. The extracted polysaccharide showed no toxicity as measured through 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide (MTT) and lactate dehydrogenase (LDH) assay on RAW cell line. Additionally, the polysaccharide over its critical micelle concentration (400, 500, 600 and 700 μg mL−1) offered emulsifying properties with 0.5%, 1% and 5% oil (v/v). The emulsion with a polysaccharide concentration of 600 μg mL−1 with 5% oil (v/v) provides stability against coalescence for 3 days.CONCLUSIONThe overall findings indicated that UAE of AAM polysaccharide can be used for an efficient extraction method, and the obtained polysaccharide is nontoxic in nature and bears emulsifying properties. © 2024 Society of Chemical Industry.

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Electrocatalytic hydrogen production and carbon dioxide conversion by earth abundant transition metal complexes of the Schiff base ligand: (E)-1-((2-dimethylamino)-propylimino)methyl)naphthalene-2-ol

Cited by 7 publications

References 57 publications

Electrocatalytic Water Oxidation by Mononuclear Copper Complexes of Bis-amide Ligands with N4 Donor: Experimental and Theoretical Investigation

Electrocatalytic Water Oxidation by Mononuclear Copper Complexes of Bis-amide Ligands with N4 Donor: Experimental and Theoretical Investigation

Investigation of The Effects of Diaminopyridine and o-Vanillin Derivative Schiff Base Complexes of Mn(II), Mn(III), Co(II) and Zn(II) Metals on The Oxidative Bleaching Performance of H2O2

Ultrasonic high‐yield extraction of non‐toxic fucose‐containing Abroma augusta polysaccharide bearing emulsifying properties

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