Synthesis and Characterization of Mixed Ligand Transition Metal(II) Complexes of Isatinimine Schiff Bases

Devi, Jai; Batra, Nisha; Yadav, Jyoti

doi:10.14233/ajchem.2019.21476

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…To study the chemical properties such as chemical bonds and oxidation states present in catalyst 1 , we conducted Fourier transform infrared spectroscopy (FTIR) and XPS analyses. In catalyst 1 ’s FTIR spectrum (Figure S10), we observe C–O stretching, M–OH stretching, NO 3 – stretching, and O–H stretching at 1078, 1344, 1566, and 3249 cm –1 , respectively. ,− Some metal oxide stretching might be occurring; however, the poor signal-to-noise ratio of the spectrum leads to a lack of definition in the wavenumber range of 500–1000 cm –1 . XPS analysis was used to supplement these observations and probe the chemical states of the elements on the surface of the catalyst before (Figure S11) and after (Figure S12) HER–OER catalytic testing of catalyst 1 .…”

Section: Resultsmentioning

confidence: 99%

Direct Laser Writing of Multimetal Bifunctional Catalysts for Overall Water Splitting

McGee

Fest

Chandler

et al. 2023

ACS Appl. Energy Mater.

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Water electrolysis is of interest as a sustainable way to produce clean hydrogen and oxygen fuel and help mitigate the rising problems of climate change while meeting global energy demands. High-efficiency, stable, and earth-abundant bifunctional catalysts are needed to enable more effective electrochemical cells for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Here, we investigate the synthesis, composition, performance, and mechanism of multimetal catalysts serving dual functionality in both OER and HER of water electrolysis. Through a laser synthesis method, we synthesized heterogeneous catalysts of nanocrystalline multimetallic alloy pockets embedded within an amorphous oxide matrix. We evaluated the performance and composition of a range of mixed transition-metal oxide materials for both OER and HER, ultimately synthesizing a Cr0.01Fe0.27Co0.34Ni0.38O x /C y catalyst that has a stable, high-rate, and competitive overall water splitting performance of 1.76 V at 100 mA cm–2 in an alkaline medium. Using density functional theory to gain insight as the active site and mechanism, we propose that the inclusion of a minor amount of Cr increases the degeneracy of energetic states that lowers the cost of forming the O 2 p–d bond and H 1 s–d bond due to the hybridization of s, p, and d orbitals from Cr. Using a two-electrode water electrolysis cell with a constant potential of 1.636 V to mimic the setup for fuel production, we found the catalyst to be stable at 14–15 mA cm–2 for 40 h. This laser synthesis method allowing for facile and rapid synthesis of complex multimetal systems demonstrates how doping a Fe, Co, and Ni heterogeneous amorphous/nanocrystalline structure with small amounts of Cr is important for bifunctional catalytic behavior, particularly for increasing HER functionality in advancing our understanding for future electrocatalytic design.

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Section: Resultsmentioning

confidence: 99%

Direct Laser Writing of Multimetal Bifunctional Catalysts for Overall Water Splitting

McGee

Fest

Chandler

et al. 2023

ACS Appl. Energy Mater.

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“…The activities of ISA free ligand and its ternary metal complexes could be confirmed from calculating the activity index (Figures 2 and 3). [60,61] Some complexes antimicrobial activity has been compared with other compounds cited in literature (Table S.1).…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial and Bioinformatic Modelling Studies of Isatin Mixed Ligand and Some Ternary Chelates

2022

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Synthesis of some ternary complexes with isatin (ISA) as primary ligand and N,N,N,N-tetramethyl ethylene diamine (TMEDA) as secondary ligand with a series of metal ions (M) Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) is presented. IR, elemental analysis, melting point, molar conductance, mass and thermal analysis were applied to characterize the prepared compounds. Conductometry measurements reveal that all complexes are non-electrolytes except Cr(III), Mn(II), Fe(III) and Co(II) complexes. In the light of magnetic and solid reflectance techniques, all prepared complexes were suggested in an octahedral geometry. ESR study of Cu(II) complex prove its octahedral geometry. The mixed ligand complexes were found to have the formulae [M-(ISA)(TMEDA)Cl 2 ] where M = Ni(II), Cu(II) and Zn(II); [M-(ISA)(TMEDA)Cl 2 ]Cl n .xH 2 O in case of M = Cr(III), Fe(III) and Cd(II) (where n = l, x = 0 for Cr(III), n = l, x = 0 for Fe(III) and n = 0, x = 2 for Cd(II) and [M(ISA)(TMEDA)Cl(H 2 O)]Cl in case of M = Mn(II)and Co(II). Antimicrobial activity of some complexes are higher than parent ligands. Molecular docking study confirmed the importance of Cu(II), Ni(II) and Cr(III) complexes as they have the highest interaction with the receptors of crystal structure of S.aureus nucleoside (PDB ID: 3Q8U), E. coli (PDB: 3T88) and protein phosphatase (PPZl) of C. albicans (PDB: 5JPE) with minimum binding energy of À 2l.5, À 7.2 and À 45.6 kcal/mol, respectively.

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“…The comparison of the growth inhibition zones of the Schiff base and its metal(II) complexes indicates that the Schiff base showed less biological activity than the respective metal(II) complexes with a zone of inhibition ranging from 10-12 mm, which increased on chelation to 13-19 mm as per the antimicrobial study. The increased biological activity of the metal chelates is obviously due to the effect of metal ions on the metal chelates, which could be explained on the basis of overtone concept and chelation theory [35] . Upon chelation, the polarity of the metal ion is reduced to a greater extent due to the overlap of the ligand orbital and partial sharing of positive charges of metal ions with donor groups.…”

Section: Antimicrobial Susceptibility Studymentioning

confidence: 99%

Synthesis, Characterization and Biocidal Activity of Some Schiff Base Metal(II) Complexes

Ahmed¹,

Aliyu²,

Ahmed³

et al. 2020

JJC

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A Schiff base, 2-[4-(N,N-dimethylamino)benzylidene]benzoic acid has been synthesized by the condensation of 4-(N,N-dimethylamino)benzaldehyde and 2-amino-benzoic acid in 1:1 molar stoichiometry. The Schiff base complexes were synthesized from the chloride salts of Fe(II), Cu(II) and Zn(II) in ethanolic medium and elucidated by infrared spectroscopy, CHN elemental analysis, atomic absorption spectroscopy as well as conductivity and magnetic susceptibility measurements. The solubility and thermal stability were also determined. The metal(II) complexes are coloured solids that are soluble in DMF and DMSO. The melting point of the Schiff base was found to be 177 oC, while the complexes decompose within a temperature range of 202–261 oC suggestive of rather good thermal stability. The molar conductance values were low, indicating non-electrolytic nature of the complexes. Elemental analysis revealed that the stoichiometries of the synthesized complexes are of 1:2 metal-to-ligand ratio. All complexes were hydrated. The spectroscopic and magnetic susceptibility data revealed that the complexes possess four- coordinate distorted square planar stereochemistry, whereas the Schiff base behaves as monoanionic bidentate ligand with the nitrogen atom of the azomethine (C=N) and carboxylate oxygen (COO-) as donor sites. The Schiff base and its corresponding metal(II) complexes were assayed against a number of bacterial and fungal strains to evaluate their inhibitory potentials. All the complexes showed significant bactericidal and fungicidal activities against the tested organisms.

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Synthesis and Characterization of Mixed Ligand Transition Metal(II) Complexes of Isatinimine Schiff Bases

Cited by 3 publications

References 10 publications

Direct Laser Writing of Multimetal Bifunctional Catalysts for Overall Water Splitting

Direct Laser Writing of Multimetal Bifunctional Catalysts for Overall Water Splitting

Antimicrobial and Bioinformatic Modelling Studies of Isatin Mixed Ligand and Some Ternary Chelates

Synthesis, Characterization and Biocidal Activity of Some Schiff Base Metal(II) Complexes

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