Nano spinel cobaltites and their catalytic and electrochemical properties: facile synthesis of metal (Co, Ni, and Zn) and mixed metal (Co–Ni and Co–Zn) complexes of Schiff bases prepared from α-ketoglutaric acid and ethyl carbazate

Parveen, S.; Nguyen, Hung Huy; Premkumar, Thathan; Puschmann, Horst; Govindarajan, S.

doi:10.1039/d0nj01016b

Cited by 15 publications

(8 citation statements)

References 63 publications

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“…[ 1 ] These are significant tools for the bioinorganic chemists as these are broadly used to design molecular ferromagnets, catalysis, and biological modeling applications, as liquid crystals and heterogeneous catalysts. [ 2,3 ]…”

Section: Introductionmentioning

confidence: 99%

Investigation of DNA binding and bioactivities of furan cored Schiff base Cu (II), Ni (II), and Co (III) complexes: Synthesis, characterization and spectroscopic properties

Venkateswarlu

Daravath

Ramesh

et al. 2021

Applied Organom Chemis

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Novel binary metal complexes, 1 [Cu(FMIMBMOP)2], 2 [Ni(FMIMBMOP)2] and 3 [Co(FMIMBMOP)3], where FMIMBMOP (2‐((E)‐((furan‐2‐yl)methylimino)methyl)‐4‐bromo‐6‐methoxyphenol), were synthesized and characterized using different analytical techniques. Result of spectral studies reveals that square planar geometry is assigned for Cu (II) and Ni (II) complexes, whereas octahedral geometry is assigned for Co (III) complex. The thermodynamic and kinetic parameters for the degradation of the complexes were ascertained by Coats–Redfern method for thermogravimetric data attained from thermogravimetric analysis (TGA). The stability of the complexes has been calculated from quantum chemical parameters using highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) energies. The DNA binding of complexes was studied by using ultraviolet–visible (UV–Vis) spectroscopic technique; screening their ability to bind to calf thymus DNA (CT‐DNA) showed that the complexes can interact with CT‐DNA through intercalation mood, where the Kb values are 2.59 ± 0.01 × 104, 7.43 ± 0.03 × 103, and 6.73 ± 0.02 × 104 M−1 for 1, 2, and 3, respectively. Stern–Volmer quenching constant (Ksv) values ranged from 2.32 ± 0.03 × 103 to 1.66 ± 0.02 × 104 M−1 were calculated for complexes from fluorescence studies. The oxidative and photolytic cleavage of supercoiled pBR322 DNA was studied and found that the complexes have cleaved this DNA effectively. The novel metal complexes have shown significant antioxidant activity against DPPH radical. The antibacterial activity of Schiff base and its metal complexes screened against Bacillus thuringiensis, Streptococcus pneumoniae, Escherichia coli, and Pseudomonas putida was investigated, and the results indicated that the metal complexes have better results than Schiff base ligand. The catalytic ability of metal complexes 1, 2, and 3 was found to be 3 > 1 > 2.

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Section: Introductionmentioning

confidence: 99%

Investigation of DNA binding and bioactivities of furan cored Schiff base Cu (II), Ni (II), and Co (III) complexes: Synthesis, characterization and spectroscopic properties

Venkateswarlu

Daravath

Ramesh

et al. 2021

Applied Organom Chemis

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“…The synthesis of MMOs has been reported via the hydrothermal method, molten-salt method, sol−gel technique, electrospinning, and co-precipitation technique. 14 Among them, hydrothermal synthesis is a facile and low-cost technique that provides better controllability over the size and morphology of the material. Herein, we validate a simple, one-step hydrothermal synthesis technique for the synthesis of NiCoZn nanorods, a ternary mixed-metal oxide (NCZMMO) for DMFC application via surface-modified glassy carbon electrode (NCZMMO/ GCE).…”

Section: Introductionmentioning

confidence: 99%

Highly Stable NiCoZn Ternary Mixed-Metal-Oxide Nanorods as a Low-Cost, Non-Noble Electrocatalyst for Methanol Electro-Oxidation in Alkaline Medium

2021

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There is an imperative necessity to develop low-cost and efficient nanocatalysts as a substitute for expensive and rare noble-metal catalysts such as platinum (Pt) and gold (Au) in overcoming the limitations of carbon monoxide and intermediate poisoning in direct methanol fuel cells (DMFCs). Herein, we report a simple, one-step hydrothermal synthesis of NiCoZn ternary mixed-metal-oxide nanorod (NCZMMO)-modified glassy carbon electrode (NCZMMO/GCE) for DMFC application. The NCZMMO/GCE electrode exhibits outstanding electro-oxidation of methanol (MeOH) at a low onset potential of 0.30 V (vs Ag|AgCl) with a high current density of 414 mA/mg in an alkaline medium (1 M KOH). This outstanding performance of the electrode is ascribed to the synergistic outcome of NCZMMO nanorods, where Ni imparts the electrocatalytic active sites for methanol oxidation reaction (MOR) through its multiple oxidation states while the excellent mechanical and chemical stability of the electrode is attributed to the oxides of Co and Zn. The electrode exhibits outstanding durability with 75% retention even at 5000 s of chronoamperometry analysis in the presence of 0.5 M MeOH, which is far superior to other reported noble-metal electrocatalysts. This superior performance of NCZMMO frontlines it as a promising non-noble, low-cost electrocatalyst for various energy conversion applications.

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“…802.90 eV), which were attributed to the Co 2+ species. These were assigned to Co 2p 3/2 and Co 2p 1/2 , respectively . For {Co 12 Cd 12 }, besides the apparent Co 2+ peaks at the same position, there were noticeable Cd 2+ peaks observed in the range of 402–416 eV.…”

Section: Resultsmentioning

confidence: 96%

“…The precise ratio (1.05:1) of Co:Cd in the bulky sample of {Co 12 Cd 12 } was further corroborated by ICP-MS, the results of which were consistent with the EDX spectroscopy results and crystal structure determination. The XPS spectra of {Co 24 } and 29 For {Co 12 Cd 12 }, besides the apparent Co 2+ peaks at the same position, there were noticeable Cd 2+ peaks observed in the range of 402−416 eV. The main peaks at 405.30 and 412.05 eV corresponded to Cd 3d 5/2 and Cd 3d 3/2 , respectively.…”

Section: ■ Experimental Sectionmentioning

confidence: 95%

Hierarchical Construction and Magnetic Difference of {Co₁₂M₁₂} (M = Co²⁺/Cd²⁺) Aggregates from {Co₁₄} Cluster-Based Precursors in the Presence of Homo/Heterometal Salts

et al. 2021

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The controllable construction and function expansion of some sophisticated aggregations represent a current hot topic in scientific research. In this paper, using a prefabricated {Co14} cluster as a synthetic precursor, a homometallic {Co24} and a heterometallic {Co12Cd12} giant cluster possessing similar dual-[M12] (M = Co/Cd) skeletons was prepared by reacting the precursor with excess CoCl2 and Cd(OAc)2 salts, respectively. The detailed structural information on {Co24} and {Co12Cd12} was characterized by single-crystal X-ray diffraction and further analyzed by X-ray photoelectron spectroscopy, inductively coupled plasma-mass spectroscopy, and scanning electron microscopy with energy dispersive X-ray (EDX) spectroscopy in the solid state. Compared to the {Co14} precursor, magnetic difference revealed that spin-canting and magnetic ordering had been enhanced in {Co24} and suppressed in {Co12Cd12} when dotted with diamagnetic Cd2+ ions.

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Nano spinel cobaltites and their catalytic and electrochemical properties: facile synthesis of metal (Co, Ni, and Zn) and mixed metal (Co–Ni and Co–Zn) complexes of Schiff bases prepared from α-ketoglutaric acid and ethyl carbazate

Abstract:
Novel divalent Co(II), Ni(II) and Zn(II) Schiff base complexes have been synthesized by reacting a prepared Schiff base (H2L, 2-(ethoxycarbonyl-hydrazono)-pentanedioic acid) with metal salts. Ligand H2L was prepared through condensation...

Cited by 15 publications

References 63 publications

Investigation of DNA binding and bioactivities of furan cored Schiff base Cu (II), Ni (II), and Co (III) complexes: Synthesis, characterization and spectroscopic properties

Investigation of DNA binding and bioactivities of furan cored Schiff base Cu (II), Ni (II), and Co (III) complexes: Synthesis, characterization and spectroscopic properties

Highly Stable NiCoZn Ternary Mixed-Metal-Oxide Nanorods as a Low-Cost, Non-Noble Electrocatalyst for Methanol Electro-Oxidation in Alkaline Medium

Hierarchical Construction and Magnetic Difference of {Co₁₂M₁₂} (M = Co²⁺/Cd²⁺) Aggregates from {Co₁₄} Cluster-Based Precursors in the Presence of Homo/Heterometal Salts

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Nano spinel cobaltites and their catalytic and electrochemical properties: facile synthesis of metal (Co, Ni, and Zn) and mixed metal (Co–Ni and Co–Zn) complexes of Schiff bases prepared from α-ketoglutaric acid and ethyl carbazate

Abstract: Novel divalent Co(II), Ni(II) and Zn(II) Schiff base complexes have been synthesized by reacting a prepared Schiff base (H2L, 2-(ethoxycarbonyl-hydrazono)-pentanedioic acid) with metal salts. Ligand H2L was prepared through condensation...

Cited by 15 publications

References 63 publications

Investigation of DNA binding and bioactivities of furan cored Schiff base Cu (II), Ni (II), and Co (III) complexes: Synthesis, characterization and spectroscopic properties

Investigation of DNA binding and bioactivities of furan cored Schiff base Cu (II), Ni (II), and Co (III) complexes: Synthesis, characterization and spectroscopic properties

Highly Stable NiCoZn Ternary Mixed-Metal-Oxide Nanorods as a Low-Cost, Non-Noble Electrocatalyst for Methanol Electro-Oxidation in Alkaline Medium

Hierarchical Construction and Magnetic Difference of {Co12M12} (M = Co2+/Cd2+) Aggregates from {Co14} Cluster-Based Precursors in the Presence of Homo/Heterometal Salts

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Abstract:
Novel divalent Co(II), Ni(II) and Zn(II) Schiff base complexes have been synthesized by reacting a prepared Schiff base (H2L, 2-(ethoxycarbonyl-hydrazono)-pentanedioic acid) with metal salts. Ligand H2L was prepared through condensation...

Hierarchical Construction and Magnetic Difference of {Co₁₂M₁₂} (M = Co²⁺/Cd²⁺) Aggregates from {Co₁₄} Cluster-Based Precursors in the Presence of Homo/Heterometal Salts