Polymeric polymorphs and a monomer of pseudohalide incorporated Cu(II) complexes of 2,4-dichlorido-6-((2-(dimethylamino)ethylimino)methyl)phenol]: Crystal structures and spectroscopic behavior

Aiswarya, N.; Sithambaresan, M.; Sreejith, S. S.; Ng, Seik Weng; Kurup, M.R. Prathapachandra

doi:10.1016/j.ica.2016.01.008

Cited by 29 publications

(10 citation statements)

References 68 publications

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“…Both copper(II) complexes exhibit axial features [(g || = 2.271, g ┴ = 2.065) and (g || = 2.266, g ┴ = 2.053)] as well as well-resolved hyperfine splitting in parallel and perpendicular region due to the interaction of the odd electron with the nuclear spin ( 63,65 Cu, I = 3/2). For these tetracoordinate complexes 3 and 4 , the fact that g|| is greater than g ┴ suggests a distorted square-planar structure consistent with the X-ray structural analysis [ 48 ].…”

Section: Resultssupporting

confidence: 61%

Mononuclear and Tetranuclear Copper(II) Complexes Bearing Amino Acid Schiff Base Ligands: Structural Characterization and Catalytic Applications

et al. 2021

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Two new glycine-Schiff base copper(II) complexes were synthesized. Single crystal X-ray diffraction (SCXRD) allowed us to establish the structure of both complexes in the solid state. The glycine-Schiff base copper(II) complex derived from 2′-hydroxy-5′-nitroacetophenone showed a mononuclear hydrated structure, in which the Schiff base acted as a tridentate ligand, and the glycine-Schiff base copper(II) complex derived from 2′-hydroxy-5′-methylacetophenone showed a less common tetranuclear anhydrous metallocyclic structure, in which the Schiff base acted as a tetradentate ligand. In both compounds, copper(II) had a tetracoordinated square planar geometry. The results of vibrational, electronic, and paramagnetic spectroscopies, as well as thermal analysis, were consistent with the crystal structures. Both complexes were evaluated as catalysts in the olefin cyclopropanation by carbene transference, and both led to very high diastereoselectivity (greater than 98%).

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Section: Resultssupporting

confidence: 61%

Mononuclear and Tetranuclear Copper(II) Complexes Bearing Amino Acid Schiff Base Ligands: Structural Characterization and Catalytic Applications

et al. 2021

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“…Two examples of helical trans ‐μ 1,1 chains with Cu(II) are already reported by our group and this complex is structurally similar except for the greater spacing of the alternate teeth (7.4498 Å) in the zipper‐like formation (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Structural Insights and Third Order NLO Studies of Pseudohalide‐ Based Polymeric and Monomeric Congeners of Halo‐Substituted Parent Schiff Bases

et al. 2018

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The present work focuses on the pseudohalide embodied copper(II) complexes of a tridentate Schiff base (HL) derived from N,N‐dimethylethylenediamine and 3,5‐dichloro‐2‐hydroxyacetophenone. Of them, two are coordination polymers and rest are monomers. The azide in the complex [Cu(L)(N3)]n, adopts an end‐on coordination mode begetting a trans helical propagation while the end‐to‐end bonding fashion of the dicyanamide in [Cu(L)[N(CN)2]n, fostered a meso‐helical chain. The interplay of covalent & non‐covalent forces develop the complexes into supramolecular architectures. Similar forces stitch the monomeric cyanato and thiocyanato complexes to chains. Quantification of intermolecular forces was achieved by surface analysis along with fingerprint plots. Charge‐transfer bands exhibit negative solvatochromic effect while the influence of the solvents on the geometry of the complexes is based on d‐d bands. Further, fluorescence and thermal studies were also done. The third order non‐linear optical (NLO) response of the complexes were recorded. Open aperture scan showed a positive NLO absorption coefficient and closed scan, a negative non‐linear refractive effect. A predominant refractive effect of the complexes make them ideal for optical switching applications.

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“…It had reported that g was less than 2.3 for covalent character and greater than 2.3 for ionic character of the metal ligand bond in the complexes [16]. According to Hathaway [37,38], the parameter G, determined as G = (g −2) / (g ⊥ −2), if G was greater than 4, the exchange interaction may be negligible; however, if G is less than 4, a considerable exchange interaction was indicated in the solid complex [39,40]. The calculated G value for the Cu(II) complex was 3.2, indicative of considerable exchange interaction between the copper centers in the solid [40].…”

Section: Electron Spin Resonance Spectrum Of Cu(ii) Complexmentioning

confidence: 99%

Synthesis, Spectroscopic Properties, Anti-Breast Cancer and Anti-Microbial Studies of Some Metal Complexes for New Schiff Base Ligand Derived From Anthranilic Acid.

El‐Halim¹,

Mohamed²,

Mahmoud³

et al. 2021

Preprint

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2,2’-((1Z-1’Z) (1,3-diphenylpropane-1,3-diylidene) bis (azanylylidene)) dibenzoic acid (H2L) Schiff base ligand, was obtained by condensation reaction between anthranilic acid and dibenzoyl methane in 2:1 ratio.A series of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) complexes was resulted from 1:1 (ligand: metal salt) reaction.The structural features of the synthesized ligand and its metal complexes was determined by elemental analyses, IR, 1H NMR, UV-Vis, ESR, mass spectra, conductivity and magnetic susceptibility measurements as well as thermal (TG/DTG) analyses. The analytical and spectroscopic tools showed that the complexes had composition of ML type with octahedral geometry. The IR results confirmed the tetradendate binding of the ligand involving two azomethine nitrogen atoms and two carboxylate oxygens. The Schiff base and its complexes have been screened for their antimicrobial activity against several bacterial organisms as (Streptococcus pneumoniae and Bacillus subtilis; Pseudomonas aeruginosa and Escherichia coli) and fungi (Aspergillus fumigatus; Syncephalastrum racemosum; Geotricum candidum and Candida albicans) by disk diffusion method.All the metal complexes have potent antimicrobial activity than the free ligand. Anticancer activity of the ligand and its metal complexes was evaluated against human cancer (MCF-7 cells viability).

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Polymeric polymorphs and a monomer of pseudohalide incorporated Cu(II) complexes of 2,4-dichlorido-6-((2-(dimethylamino)ethylimino)methyl)phenol]: Crystal structures and spectroscopic behavior

Cited by 29 publications

References 68 publications

Mononuclear and Tetranuclear Copper(II) Complexes Bearing Amino Acid Schiff Base Ligands: Structural Characterization and Catalytic Applications

Mononuclear and Tetranuclear Copper(II) Complexes Bearing Amino Acid Schiff Base Ligands: Structural Characterization and Catalytic Applications

Structural Insights and Third Order NLO Studies of Pseudohalide‐ Based Polymeric and Monomeric Congeners of Halo‐Substituted Parent Schiff Bases

Synthesis, Spectroscopic Properties, Anti-Breast Cancer and Anti-Microbial Studies of Some Metal Complexes for New Schiff Base Ligand Derived From Anthranilic Acid.

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