Copper(II) complexes with box or flower type morphology: Sustainability versus perishability upon catalytic recycling

Kumar, Ravinder; Yadav, Anjana; Mahiya, Kuldeep; Mathur, Pavan

doi:10.1016/j.ica.2016.06.012

Cited by 6 publications

(3 citation statements)

References 46 publications

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“…SEM studies showed agglomeration upon reused catalyst decreases the catalytic activity due to changes in the catalyst's surface and it affects the catalytic activity. Therefore, it corroborates that the morphology and exposed crystal face of the catalyst play an important role in an alkynes oxidation reaction and the rod shows superior catalytic activity [58][59][60][61] .…”

Section: Sem Analysissupporting

confidence: 70%

Morphology based catalytic oxidation of phenylpropyne into 1,2-diketones, aldehyde and acid using Cu(II) complex

Kaushik,

Malik,

Tevatia

et al. 2023

Appl. Chem. Eng.

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Aldehyde, 1,2-diketones, and acid were prepared by copper-catalyzed oxidation of phenyl propyne, using t-BuOOH as the oxidant, heterogeneously. Aldehyde is formed as a major product under neutral conditions. Under mild conditions, catalysis was carried out using catalytic amounts of [Cu(L)Br] with N-methyl benzimidazolyl Schiff base ligand and stoichiometric amounts of oxidant in CH3CN. The several properties of the catalyst were characterized by using UV-Vis, FT-IR, PXRD, CV, and Electron paramagnetic resonance techniques. Comparative SEM measurement of catalyst before and after the catalysis shows that the morphology and size of rods affect the catalytic efficiency. The percentage yields of products were determined by GC-MS.

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Section: Sem Analysissupporting

confidence: 70%

Morphology based catalytic oxidation of phenylpropyne into 1,2-diketones, aldehyde and acid using Cu(II) complex

Kaushik,

Malik,

Tevatia

et al. 2023

Appl. Chem. Eng.

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“…The Cu 2p peaks at 935 eV and 954.9 eV and the satellite peak at 945 eV were definitive evidence for the presence of the coordinated copper ion(II) (Scheme 1). Besides, the Cu 2p peaks at 932.4 eV and 952.3 eV suggested the presence of the copper ion(II) in CuSO4, which might be temporarily adsorbed on carbon materials [31].…”

Section: Xps and Powder X-ray Diffraction Of The Catalystmentioning

confidence: 99%

Carbon-Supported Copper-Based Nitrogen-Containing Supramolecule as an Efficient Oxygen Reduction Reaction Catalyst in Neutral Medium

Zhao

Chu

et al. 2018

Catalysts

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Abstract:In this work, a nitrogen-containing bidentate ligand named 5,5 -(9-octyl-9H-carbazole-2,7-diyl)bis(1,10-phenanthroline) (OCBP) was synthesized as a nitrogen precursor for making an oxygen reduction catalyst. The 1,10-phenanthroline unit provides a coordination site for copper ions, and the resulting Cu-N x unit may be responsible for the catalytic activities of the catalyst. Carbon black was selected as a support to improve the electroconductibility of the resulting catalyst. The metallo-supramolecule (Cu-SOCBP) was dispersed on the surface of Vulcan XC-72 carbon and was used as a catalyst (designated as Cu-SOCBP/C) for the oxygen reduction reaction (ORR). The microscope structure and surface components of the catalyst were acquired via scanning electron microscopy and X-ray photoelectron spectroscopy, as well as X-ray powder diffraction. The electrochemical property and ORR mechanism of Cu-SOCBP/C were analyzed using a variety of electroanalytical methods including cyclic voltammetry, electrochemical impedance spectroscopy, and linear sweep voltammetry. These results show that Cu-SOCBP/C was successfully synthesized and that ORR was achieved mainly via a four-electron transfer process to water. Thus, Cu-SOCBP/C was an effective catalyst and might have potential application as a cathodic catalyst in microbial fuel cells, which operate in an aqueous medium.

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“…In recent decades, studies on coordination compounds have been well developed, and the developed organometallic complexes have been widely used in many fields, such as the catalysts used in the chemical and petrochemical industries [1], the molecular recognition reagents used in analytical measurements [2], and the oxygen reduction catalysts used in fuel cells [3]. Most noticeably, many new fields have been developed, such as macrocyclic coordination compounds [4], supramolecular complexes [5], metal-organic frameworks [3], and functional complexes [5].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Coordinated Molecules of Two Gly-Schiff Base Copper Complexes on Their Oxygen Reduction Reaction Performance

Chu

et al. 2018

Catalysts

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In this study, two simple Schiff base copper complexes [Cu(H 2 O) 2 (HL)]•2H 2 O (Complex 1) (H 3 L = 2-OH-4-(OH)-C 6 H 2 CH=NCH 2 CO 2 H) and [Cu(py) 2 (HL)] (Complex 2) (Py = pyridine) were initially achieved and authenticated by single-crystal X-ray structure analyses (SXRD), powder X-ray diffraction analyses (PXRD), FT-IR spectroscopy, and elemental analyses. The SXRD reveals that the Cu 2+ center in Complex 1 exhibited a distorted square pyramidal geometry, which is constructed based on phenolate oxygen, water molecules, carboxylate oxygen, and imine nitrogen from a deprotonated H 3 L ligand in an NO 4 fashion. The Cu 2+ atom in Complex 2 had distorted square pyramidal geometry, and was coordinated with two pyridine molecules and one Gly-Schiff base ligand, exhibiting an N 3 O 2 binding set. Additionally, the free water molecules in Complex 1 linked independent copper complexes by intermolecular hydrogen bond to form a 2D framework. However, the one-dimensional chain supramolecular structure of Complex 2 was formed by the intermolecular O-H. .. O hydrogen bonds. The oxygen reduction performance of the two complexes was analyzed by cyclic voltammetry (CV) and the rotating disk electrode (RDE) method. Both complexes could catalyze the conversion of oxygen to water through a predominant four-electron pathway, and the Cu-N x O y moieties might be the functional moieties for the catalytic activity. The catalytic pathways and underlying mechanisms are also discussed in detail, from which the structure-activity relationship of the complexes was obtained.

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Copper(II) complexes with box or flower type morphology: Sustainability versus perishability upon catalytic recycling

Cited by 6 publications

References 46 publications

Morphology based catalytic oxidation of phenylpropyne into 1,2-diketones, aldehyde and acid using Cu(II) complex

Morphology based catalytic oxidation of phenylpropyne into 1,2-diketones, aldehyde and acid using Cu(II) complex

Carbon-Supported Copper-Based Nitrogen-Containing Supramolecule as an Efficient Oxygen Reduction Reaction Catalyst in Neutral Medium

The Effects of Coordinated Molecules of Two Gly-Schiff Base Copper Complexes on Their Oxygen Reduction Reaction Performance

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