Copper(II) complexes derived from di-2-pyridyl ketone-N4-phenyl-3-semicarbazone: Synthesis and spectral studies

Reena, T.A.; Kurup, M.R. Prathapachandra

doi:10.1016/j.saa.2010.03.011

Cited by 23 publications

(4 citation statements)

References 40 publications

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“…For 3, the g k =A k (162 cm) value indicates the presence of a considerable tetrahedral distortion in the xy-plane from the square planar geometry. The anisotropic spectrum of 3 is similar to those previously reported for distorted tetrahedralbased coordination polyhedral [40,41]. No band corresponding to M s = 2 transition was observed in the solid spectrum of 3 ruling out the possibility of Cu-Cu interaction.…”

Section: Electronic Structure Magnetic and Eprsupporting

confidence: 84%

Thermal, spectral, DFT and biological activity evaluation of Co(II), Ni(II) and Cu(II) complexes of N,S-chelated benzotriazole ligand

Mansour

2015

J Therm Anal Calorim

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ML 2 ]ÁyC 2 H 5 OHÁzH 2 O complexes (M=Co II (1) and Ni II (2), y = 4, z = 0; M=Cu II (3), y = 0, z = 3; HL = N-(2-thiazolyl)-1H-benzotriazole-1-carbothioamide) were prepared, characterized (elemental analysis, TG, FT IR, UV-Vis, EPR, magnetic and conductance measurement) and tested for their antimicrobial activity against Escherichia coli and Staphylococcus aureus. Complexes 1-3 consist of a metal center having a considerable tetrahedral distortion in the xy-plane from the square planar stereochemistry MN 2 S 2 formed by the two deprotonated benzotriazole ligands. TD-DFT calculations were carried out at B3LYP/6-31G * level of theory to understand the electronic structure and to explain the related experimental findings. Natural bond orbital analysis was performed to provide details about the electronic arrangement, type of hybridization and the nature of bonding. Coordination of HL to Co II gave rise to inactive compound, but the development of Ni II and Cu II complexes did not clearly change the toxicity of the free HL.

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Section: Electronic Structure Magnetic and Eprsupporting

confidence: 84%

Thermal, spectral, DFT and biological activity evaluation of Co(II), Ni(II) and Cu(II) complexes of N,S-chelated benzotriazole ligand

Mansour

2015

J Therm Anal Calorim

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“…The appearance of ν(C=O amide ) absorption band suggests the existence of HL ligand in the solid state as ketoamine form (supporting information Scheme S2). [33] Comparison of the IR spectra of the metal complexes with that of the free ligand revealed disappearance of the stretching frequency of -C=O amide at 1710 cm À1 of free ligand after coordination, suggesting involving of this group in coordination sphere in the enolate form. The involvement of the νC-O-H group in complex formation is apparent from the red shift of νC-O by 7-10 cm À1 due to C-O-M bond formation.…”

Section: Resultsmentioning

confidence: 98%

New nickel (II), cobalt (III), and iron (III) complexes with N′‐[(2‐aminochromon‐3‐yl)methylidene]benzohydrazide: Synthesis, characterization, solvatochromic shift, dipole moment, and DFT calculations

Adly

Taha

Ibrahim

2022

Applied Organom Chemis

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New Ni (II), Co (III), and Fe (III) complexes of hydrazone (HL) derived from 2‐aminochromone‐3‐carboxaldehyde with benzoyl hydrazine were synthesized and characterized by elemental analyses, spectral (UV–Vis, IR, Mass, 1H, and 13C‐NMR) data, as well as magnetic susceptibility, molar conductivity measurements, and thermal gravimetric analysis (TGA). The ligand behaves as monobasic with ONO donor sites, forming square planar geometry with Ni (II) and octahedral geometries with both Co (III) and Fe (III) complexes. Solvent effects on the absorption and fluorescence spectra of the prepared complexes were investigated in 11 different solvents with diverse polarities. Lippert–Mataga, Bakhshiev, Kawski–Chamma–Viallet, and Reichardt‐solvatochromic methods were applied to estimate the dipole moments of the ground and excited state (μg and μe). Multiple linear regression analysis was useful to specify the extent of specific and nonspecific solute–solvent interactions using Kamlet–Taft and Catalan solvatochromic models. The Stoke's shifts of complexes were mainly controlled by the polarity/polarizability parameter of the solvent. Density function theory (DFT) at B3LYP/6‐311G(d,p) level engaged in the Gaussian 09 program was carried out to optimize the structures of the ligand and its complexes. Structural parameters data are correlated with the experimental data. Also, using Coats–Redfern techniques, the kinetic parameters were calculated for each thermal degradation stage of metal complexes. Finally, in vitro bioassays of the ligand and its complexes against Gram‐negative, Gram‐positive bacteria and the fungus strain were tested for these compounds with good results.

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“…Figure 5 shows the absorption spectra of copper (II) complexes and free ligands recorded in methanol, and electronic spectral data are summarized in Table 4 ; free ligands have two absorption bands at 241–264 and 338–382 nm due to π → π * transitions of the aromatic ring and n –π * transitions of the C=N groups, respectively; the width of the second band reaches the violet region in the visible spectrum, resulting in the characteristic yellow complementary color [ 41 ]. The copper (II) complex spectra show the same π–π * and n –π * transitions, with a slight bathochromic shift; the permanence of these absorption bands is indicative of the presence of the ligand in the structure [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

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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Copper(II) complexes derived from di-2-pyridyl ketone-N4-phenyl-3-semicarbazone: Synthesis and spectral studies

Cited by 23 publications

References 40 publications

Thermal, spectral, DFT and biological activity evaluation of Co(II), Ni(II) and Cu(II) complexes of N,S-chelated benzotriazole ligand

Thermal, spectral, DFT and biological activity evaluation of Co(II), Ni(II) and Cu(II) complexes of N,S-chelated benzotriazole ligand

New nickel (II), cobalt (III), and iron (III) complexes with N′‐[(2‐aminochromon‐3‐yl)methylidene]benzohydrazide: Synthesis, characterization, solvatochromic shift, dipole moment, and DFT calculations

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

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