Cobalt(III) complexes of 2-hydroxyacetophenone N(4)-phenyl semicarbazone containing heterocyclic coligands: syntheses, structure and spectral studies

Sreekanth, Anandaram; Kala, U.L.; Nayar, Chandini R; Kurup, M.R. Prathapachandra

doi:10.1016/j.poly.2003.09.029

Cited by 79 publications

(35 citation statements)

References 18 publications

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“…The asymmetric and symmetric stretching vibrations of the acetate group appear at 1520 and 1384 cm −1 respectively for the acetato complex 2 having the separation value = 136 cm −1 suggests the presence of chelating acetate group linked with the metal center for the complex [26,27]. For the nitrato complex 3, three strong bands at 1542, 1384 and 1298 cm −1 are observed corresponding to 1 , 2 and 4 of the nitrato group indicating the presence of a terminal monodentate coordination of the nitrato group [28].…”

Section: Infrared Spectral Studiesmentioning

confidence: 96%

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

Reena

Kurup

2010

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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(5) of di-2-pyridyl ketone-N 4 -phenyl-3-semicarbazone (HL) were synthesized and characterized by elemental analyses and electronic, infrared and EPR spectral techniques. In all these complexes the semicarbazone undergoes deprotonation and coordinates through enolate oxygen, azomethine and pyridyl nitrogen atoms. All the complexes are EPR active due to the presence of an unpaired electron. EPR spectra of all the complexes in DMF at 77 K suggest axial symmetry and the presence of half field signals for the complexes 1 and 3 indicates dimeric structures.

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Section: Infrared Spectral Studiesmentioning

confidence: 96%

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

Reena

Kurup

2010

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…This is further confirmed by the appearance of the new band at 515-525 and 425-430 cm −1 due to the ν(M-N) and ν(M-O) [35,36]. The NMR spectrum of the ligand was done in DMSO-d 6 . The 1 H NMR spectral data are reported along with the possible assignments in the experimental section.…”

Section: Resultsmentioning

confidence: 72%

“…The chemistry of transition metal complexes with multidentate [1][2][3][4][5][6] ligands have been attracted particular attention because these metal ions can exhibit several oxidation states. The different oxidation states of these complexes showed a strong role in bioinorganic chemistry and redox enzyme system.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structural Properties of Copper(II), Nickel(II) and Cobalt(II) Complexes with 2,4-Furyliminobenzylacetophenone

Singh

2012

ISRN Physical Chemistry

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The new Schiff base ligand (FIAS) 2,4-furyliminobenzylacetophenone has been synthesized with 4-aminoacetophenone and furane-2-carboxaldehyde by condensation in ethanol. Metal complexes of the ligand were prepared with chloride salts of copper(II), nickel(II) and cobalt(II) in ethanol. The ligand and its metal complexes have been characterized by microanalysis, magnetic susceptibility, FTIR, 1 H and 13 C NMR, mass spectrum, and UV-visible spectroscopy techniques. From these findings, it is suggested that metal ion coordinate by imines nitrogen and carboxylic oxygen atoms of FIAS to form octahedral geometry. All the newly compounds were tested antimicrobial activity against bacterial and fungal species.

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“…The shift of ν(N-N) stretch of the complexes to higher energy by ∼15-31 cm −1 comparing to that of free ligand can be another evidence for the involvement of azomethine nitrogen in coordination [28,31,32]. The IR spectra of complexes derived from H 2 L 1 ligand shows a broad band between 3354-3213 cm −1 , which can be attributed to the free OH stretching mode indicating non-participation of phenolic (OH) group in coordination.…”

Section: Synthesesmentioning

confidence: 90%

“…The tautomeric keto forms of ligands were also indicated by 1 H-NMR spectroscopy since the enolic OH signals of enol forms of ligands were not observed but amide NH signal of keto forms appeared around 10.14-11.19 ppm [17,18]. Furthermore, the observation of strong ν(C=O) absorption bands around 1649-1664 cm −1 in the infrared spectra of the ligands suggest that the ligands are in the keto form in the solid state [19,20] In the case of (H 2 L 1 ) ligand a broad peak is observed in the 3322 cm −1 region which is assigned to phenolic (OH) absorption, while in the case of IR spectra of (H 2 L 2 ) ligand, the peaks observed at 1521 and 1353 cm −1 are attributed to symmetric and asymmetric stretching vibrations of nitro group [17,20], [28]- [31]. The characteristic IR peaks of hydrazone compounds synthesized in this work are given in Table 3.…”

Section: Synthesesmentioning

confidence: 99%

Synthesis and characterization of bis-acylhydrazone derivatives as tetradentate ligands and their dinuclear metal(II) complexes

Mohammed¹

2012

Per. Pol. Chem. Eng.

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Two novel bis-acylhydrazone where as 1,4-diacetylbenzene bis(4-hydroxy benzoyl hydrazone) H IntroductionHydrazones are the condensation products of hydrazine derivatives with carbonyl compounds, they contain an acyclic group >C=N-N< . It is long since hydrazones and their derivatives, due to their high complexing ability, have attracted the attention of scientists. Depending on various factors (the nature of the hydrazone and the metal atom, reaction conditions, the ratio of reactants etc.) hydrazones form either mono-or polynuclear coordination compounds with metal atoms [1].Aroyl hydrazones and their metal derivatives often possess biological activity and can inhibit enzymatic reactions in the cell [2]-[4]. Edward et al. have shown that replacement of the aromatic group by other moieties in some antibiotics improves their antibiotic activity [5,6]. Apart from biological applications owing to the presence of the toxicologically important N-C=O moiety, hydrazones act as potential donors for different metal ions. These ligands contain an amide bond and are capable of undergoing keto-enol tautomerism: they can coordinate to central metal ions through nitrogen and/or oxygen [7]. Their coordination behaviour also depends upon the pH of the medium, the nature of the substituents and the metal [8].Intensive investigations of the coordination chemistry of dinuclear metal complexes with chelating ligands continue to be stimulated by interest for metallobiomolecules [9], the search for appropriate systems for binding and activating simple molecules, catalysis and magnetic interactions [10,11]. In spite of the greatest effort and success in the study of dinuclear copper(II) complexes, such complexes have still attracted much attention due to their interesting properties and the relative simplicity of their synthesis.Many studies of polyfunctional Schiff bases and monohydrazones as well as their complexes have been carried out [12,13]. Relatively few reports are available on the coordination behaviour of bis-acylhydrazone. These ligands might have interesting ligational features since they contain additional donor sites, i.e. C=O, N-H, azomethine nitrogen atom, etc. Herein, we report the synthesis and spectroscopic studies of dinuclear metal(II) polymeric complexes containing 1,4-diacetylbenzene bis(4-hydroxy benzoylhydrazone) (H 2 L 1 ) and

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Cobalt(III) complexes of 2-hydroxyacetophenone N(4)-phenyl semicarbazone containing heterocyclic coligands: syntheses, structure and spectral studies

Cited by 79 publications

References 18 publications

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

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

Synthesis and Structural Properties of Copper(II), Nickel(II) and Cobalt(II) Complexes with 2,4-Furyliminobenzylacetophenone

Synthesis and characterization of bis-acylhydrazone derivatives as tetradentate ligands and their dinuclear metal(II) complexes

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