Synthesis, spectral, electrochemical and catalytic properties of Cu(II), Ni(II) and Co(II) complexes containing N, O donors

Raja, K. Kanmani; Easwaramoorthy, D.; Rani, S. Kutti; Rajesh, Jegathalaprathaban; Jorapur, Yogesh R.; Thambidurai, S.; Athappan, Pr.; Rajagopal, Gurusamy

doi:10.1016/j.molcata.2008.12.021

Cited by 25 publications

(4 citation statements)

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“…This and further oxidation to a quinine-type oxidation product has been supported by EPR spectroscopy upon chemical oxidation with cerium sulfate for methoxy-substituted imino phenoxide Cu(II) complexes [ 52 ]. Complexes 1 , 2 , and 4 show similar electrochemical behaviors as described before with different degrees of reversibility of the oxidation reaction [ 52 , 55 ]. The oxidation potential of complex 3 is much higher than for the other complexes (Fig.…”

Section: Resultsmentioning

confidence: 80%

“…In continuation of our previous work on metal complexes containing imino phenoxide ligands, we describe herein the use of these ligands for the synthesis of four novel Cu(II) complexes. In principle, this class of complexes is well studied for different applications [ 38 – 55 ]. These complexes are easy to prepare and stable towards air and moisture and, therefore, they are much easier to handle compared to the sensitive polymerization catalysts based on 1st, 4th, 5th, and 13th group metals [ 3 – 7 ].…”

Section: Introductionmentioning

confidence: 99%

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Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide

et al. 2016

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Four new copper complexes based on bidentate imino phenoxide ligands were synthesized and characterized by IR, UV–Vis spectroscopy, ESI mass spectrometry, single crystal X-ray diffraction, and electrochemistry. The crystal structures revealed that the copper(II) atoms are surrounded by phenolate oxygen and imine nitrogen atoms of two ligands in a distorted square-planar geometry. The existence of ligand-centered, as well as Cu(II)-centered quasi-reversible and reversible redox reactions are observed in the cyclic voltammetry experiments of all the complexes. All complexes are able to catalyze the ring-opening polymerization of rac-lactide yielding polymers with moderate molecular weights and moderately broad molecular weight distributions.Graphical abstract Electronic supplementary materialThe online version of this article (doi:10.1007/s00706-016-1830-7) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide

et al. 2016

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“…The IR spectrum of the free Schiff base ligand exhibits broad bands at 3050 and 3250 cm −1 , which are attributed to the stretching frequencies of aromatic hydroxyl substituent and allylic hydroxyl substituent. The disappearance of aromatic hydroxyl group band after complexation indicates the coordination through phenolic –OH with the central metal ion . The characteristic band around 3239 cm −1 remains in the spectra of the complexes and shows the non‐coordination of allylic –OH to the central metal ion.…”

Section: Resultsmentioning

confidence: 74%

In vitro antimicrobial and antioxidant evaluation of rare earth metal Schiff base complexes derived from threonine

Lekha

Kamatchi²,

Rajmohan³

et al. 2014

Applied Organom Chemis

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Six novel Ln(III) Schiff base complexes were synthesized using rare earth metals with threonine and 5-bromosalicylaldehyde, namely Pr(III), Sm(III), Gd(III), Tb(III), Er(III) and Yb(III) Schiff bases. These complexes were characterized using elemental analysis, molar conductivity, Fourier transform infrared and UV-visible spectroscopies, and thermogravimetry-differential thermal analysis. The general formula of the complexes is [Ln(L)(NO 3 ) 2 (H 2 O)].NO 3 (L = Schiff base ligand). The spectroscopic data reveal that the Schiff base ligand behaves as a tridentate ligand with ONO donor atoms sequencing towards the central metal ion. An investigation of fluorescence properties of the Sm(III), Er(III) and Tb(III) complexes shows that the Ln(III) ions can be sensitized efficiently by the ligand to some extent. Antimicrobial activity testing indicates that all six complexes exhibit antibacterial and antifungal ability against microbes with broad antimicrobial spectra. In addition, the antioxidant properties of the complexes were also screened.

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“…[ 66 ] Similarly, the μ eff of the binuclear Cu (II) complex is 2.13 B. M, indicative of tetrahedrally distorted square planar geometry around the central metal ions, corresponding to one unpaired electron [ 67,68 ] such in the case of previously reported series of Cu (X‐DPMP) 2 complexes where [DPMP = 2‐[(2,6‐diisopropylphenylimino)methyl]phenol, X = Br, Cl, I]. [ 69 ] The stability of the H 2 L free ligand and the newly synthesized complexes were monitored over 24 h and there was slight or no change in their absorption spectra.…”

Section: Resultsmentioning

confidence: 98%

Design, synthesis, spectral characterization, photo‐cleavage, and in vitro evaluation of anticancer activities of new transition metal complexes of piperazine based Schiff base‐oxime ligand

Ragab

Soliman

Shehata

et al. 2022

Applied Organom Chemis

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The newly synthesized Schiff base‐oxime ligand, namely, (2Z,3E)‐3‐((3‐(4‐(3‐(((2E,3E)‐3‐(hydroxyimino)butan‐2‐ylidene)amino)propyl)piperazin‐1‐yl)propyl)imino)butan‐2‐one oxime (H2L) and its Co (II), Cu (II), and Zn (II) complexes were reported. The characterization was accomplished with the aid of CHN‐EA, mass, fourier transform infrared spectroscopy (FT‐IR), electronic spectra, magnetic moment, molar conductance and TGA. According to the spectroscopic approaches, the synthesized ligand (H2L) may act as a tetradentate or hexadentate (bis‐tridentate) coordinating ligand through the azomethine nitrogen, piperazinyl nitrogens, and oximato‐nitrogens affording distorted square planar mononuclear Co (II) complex or tetrahedrally distorted square planar binuclear Cu (II) and Zn (II) complexes whereas the coordination mode varies according to the nature of the metal ion. The microbial resistance of all the synthesized compounds was evaluated and reported. Findings showed that the Cu (II) complex has mostly the highest inhibitory effects against all tested microbial strains. Besides, the anticancer nature of the studied compounds was also evaluated against a panel of three different human cancer cells, including (HCT‐116), (MDA‐MB‐231), (HepG2) in addition to the (WI‐38) used as a healthy cells. In general, the Cu (II) complex displayed the best cytotoxic profiles against the tested cells than the Co (II) and Zn (II) complexes with negligible toxicity towards the (WI‐38) normal cells. The DNA cleavage activities of all tested compounds were assayed against pBR322 plasmid DNA. Whereas, the Cu (II) complex showed the highest DNA cleavage propensity, which proceeds predominantly via the oxidative mechanism. Additionally, flow cytometric analysis dictates that the Cu (II) complex induces cell cycle arrest in S‐phase and apoptotic cell death on HCT‐116 cells. The morphological transformations distinguished in HCT‐116 cells treated with Cu (II) complex have been depicted with the aid of scanning electron microscopy (SEM). The docking results indicate that the Cu (II) complex strongly interacts with human colon cancer (6GUE), Escherichia coli (3T88), Klebsiella pneumoniae (4HL2), and Staphylococcus aureus (3WQU) proteins, through different modes of interactions that harmonize successfully with the experimental results.

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Synthesis, spectral, electrochemical and catalytic properties of Cu(II), Ni(II) and Co(II) complexes containing N, O donors

Cited by 25 publications

References 50 publications

Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide

Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide

In vitro antimicrobial and antioxidant evaluation of rare earth metal Schiff base complexes derived from threonine

Design, synthesis, spectral characterization, photo‐cleavage, and in vitro evaluation of anticancer activities of new transition metal complexes of piperazine based Schiff base‐oxime ligand

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