Synthesis, characterization and catalytic activities towards epoxidation of olefins of dinuclear copper(II) complexes

Halder, Shibashis; Mukherjee, A. K.; Ghosh, Koushik; Dey, Sudipto; Nandi, Mahasweta; Roy, Partha

doi:10.1016/j.molstruc.2015.08.017

Cited by 16 publications

(9 citation statements)

References 32 publications

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“…1d), the peak appearing at 1609 cm À1 is corresponds to azomethine (C]N) vibration. As seen in the spectrum of the nanocatalyst (5) (Fig. 1e), shifting of C]N band to lower frequency confirmed the coordination of azomethine nitrogen to the metal center.…”

Section: Preparation and Characterization Of The Nanocatalystmentioning

confidence: 56%

“…Since the peak positions of compounds (2) ( Fig. 2b) and (5) (Fig. 2c) in comparison to those of (1) ( Fig.…”

Section: Preparation and Characterization Of The Nanocatalystmentioning

confidence: 97%

“…In the next step, treating compound (3) with 2ʹ-hydroxypropiophenone caused condensation of carbonyl group with the surface amino group, which produced Schiff base groups on the support (compound 4). Finally, the reaction of Co(II) chloride with compound (4) led to the construction of Fe 3 O 4 @SiO 2 -Schiff base-Co(II) nanocatalyst (5).…”

Section: Preparation and Characterization Of The Nanocatalystmentioning

confidence: 99%

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High catalytic activity of magnetic Fe3O4@SiO2-Schiff base-Co(II) nanocatalyst for aerobic oxidation of alkenes and alcohols and DFT study

Sarkheil

Lashanizadegan

Ghiasi

2019

Journal of Molecular Structure

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A new heterogeneous nanocatalyst (Fe 3 O 4 @SiO 2-Schiff base-Co(II)) was successfully fabricated applying silica-coated magnetite nanoparticles as a suitable and efficient support for covalent anchoring of a cobalt(II) Schiff base complex. This catalyst was characterized by FT-IR, XRD, SEM, TEM, EDX, ICP-OES, CHN, DRS, TGA, VSM techniques, and QM study. According to theoretical calculations, the Schiff base-Co(II) complex at high spin state with square planar geometry is more stable than low spin state. Also, Schiff base-Co(II)/imidazole complex has distorted square pyramidal geometry. Evaluating the activity of the nanocatalyst was performed for the oxidizing of different olefins (styrene, norbornene, amethyl styrene, cyclohexene, and cyclooctene) and alcohols (benzyl alcohol, benzhydrol, n-butanol, noctanol and n-heptanol). In these reactions, the influence of two various oxidants, molecular oxygen and tert-butyl hydroperoxide (TBHP), were examined. The results exhibited that the nanocatalyst was considerably effective for the aerobic epoxidation of norbornene, cyclohexene, and cyclooctene with 100% conversion and selectivity within 1 h. Also, by oxidizing of benzyl alcohol and benzhydrol, benzoic acid (conversion: 94%, selectivity: 91%) and benzophenone (conversion and selectivity: 100%) were achieved, respectively. The results suggested that the nanocatalyst has a remarkable role in oxidation reaction of olefins and alcohols. Other promising advantages of the catalyst were easy magnetic separation and recyclability for several times without significant loss of catalytic efficiency.

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Section: Preparation and Characterization Of The Nanocatalystmentioning

confidence: 56%

“…Since the peak positions of compounds (2) ( Fig. 2b) and (5) (Fig. 2c) in comparison to those of (1) ( Fig.…”

Section: Preparation and Characterization Of The Nanocatalystmentioning

confidence: 97%

Section: Preparation and Characterization Of The Nanocatalystmentioning

confidence: 99%

See 1 more Smart Citation

High catalytic activity of magnetic Fe3O4@SiO2-Schiff base-Co(II) nanocatalyst for aerobic oxidation of alkenes and alcohols and DFT study

Sarkheil

Lashanizadegan

Ghiasi

2019

Journal of Molecular Structure

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“…incorporated materials have been used as catalysts in C−H activation of alkenes. We have effectively used copper(II) complexes of Schiff‐base ligands as catalyst in the epoxidation of olefins in homogeneous medium ,. Impregnated copper(II) or nickel(II)complexes with Schiff‐base ligands on mesoporous silica can turn homogeneous catalysts into heterogeneous ones and these heterogenized catalysts have been effective in olefin epoxidation in liquid phase .…”

Section: Introductionmentioning

confidence: 93%

Cu- and Ni-Grafted Functionalized Mesoporous Silica as Active Catalyst for Olefin Oxidation

et al. 2017

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Mesoporous silica has been functionalized with 3‐aminopropyl triethoxy silane (3‐APTES), followed by Schiff‐base condensation with 2‐hydroxy‐1‐naphthaldehyde. Incorporation of copper and nickel by covalent grafting onto the Schiff‐base loaded materials gives two heterogenized catalysts namely, Cu–Cat and Ni‐Cat, respectively. The materials have been characterized by PXRD analyses, nitrogen sorption studies, TEM, TGA, FT‐IR, UV‐visible and solid state MAS‐NMR spectroscopy. The metal‐contents in the samples are estimated using ICP‐AES studies. Cu–Cat and Ni‐Cat have been used as active catalyst in the oxidation of various olefins e. g. styrene, α‐methyl styrene, cyclohexene, trans stilbene and cyclooctene in the presence of tert‐butyl hydroperoxide as the oxidant in acetonitrile under mild conditions. Different products have been analyzed by gas chromatography and gas chromatography‐mass spectrometry. The results show high conversion of the substrates, moderate to good product selectivity and high TOFs of the reactions. The catalysts are recycled without deteriorating their activities and heterogeneous nature.

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“…The preparation of N, O‐donor ligands by Schiff base condensation reaction is popular amid scientists. Most of the transition metal complexes with Schiff base ligands have been developed in a number of necessary fields of applications, for example, magnetism, optoelectronics, biological sciences, catalysis, sensing, etc. On the other hand, because of the strong coordination behaviour and high biological activity, some of the Schiff base complexes derived from amino acids have become a hot research topic for years .…”

Section: Introductionmentioning

confidence: 99%

Probing of effective pyrazolone based metallonucleases: Molecular docking and in vitro biological critiques

Arunadevi¹,

Paulpandiyan²,

Raman³

2018

Applied Organom Chemis

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Four novel tryptophan based metal (II) complexes of the type [ML (Try)2] were prepared by using pyrazolone derived Schiff base ligand. The proposed structure was confirmed by physicochemical methods which reveal octahedral coordination environment around the metal center. Intercalative binding mode of the complexes with CT DNA was confirmed by electronic absorption titration, viscosity measurements and fluorescence spectroscopy. Efficiency of DNA cleavage ability of the metal complexes was explored by the gel electrophoresis technique. The antimicrobial activities of the metal complexes showed potent biocidal activity. The percentage of free radical scavenging activity shows that the complexes are very reactive towards DPPH. Moreover, their cytotoxicity was tested against the two cancer cell lines (MCF‐7 and HepG2) and one normal cell line (NHDF) respectively. The MTT assay shows that the complexes have the anticancer efficacy. Moreover, the complexes exhibit a limited cytotoxicity effect on normal cell line NHDF. The morphological changes of apoptosis cell death were investigated by using Hoechst 33258 staining method. In addition, the Molecular docking studies was executed to consider the nature of binding and binding affinity of the synthesized compounds with DNA (PDB: 1BNA) and protein (PDB: 3hb5).

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Synthesis, characterization and catalytic activities towards epoxidation of olefins of dinuclear copper(II) complexes

Cited by 16 publications

References 32 publications

High catalytic activity of magnetic Fe3O4@SiO2-Schiff base-Co(II) nanocatalyst for aerobic oxidation of alkenes and alcohols and DFT study

High catalytic activity of magnetic Fe3O4@SiO2-Schiff base-Co(II) nanocatalyst for aerobic oxidation of alkenes and alcohols and DFT study

Cu- and Ni-Grafted Functionalized Mesoporous Silica as Active Catalyst for Olefin Oxidation

Probing of effective pyrazolone based metallonucleases: Molecular docking and in vitro biological critiques

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