Transition metal quinone–thiosemicarbazone complexes 1: Evaluation of EPR covalency parameters and redox properties of pseudo-square-planar copper(II)–naphthoquinone thiosemicarbazones

Chikate, Rajeev C.; Belapure, Avadhoot R.; Padhyé, Subhash; West, Douglas X.

doi:10.1016/j.poly.2005.02.011

Cited by 73 publications

(32 citation statements)

References 53 publications

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“…This indicates that in these complexes HL has undergone deprotonation and coordinated in the enolate form. It is further corroborated with the appearance of a band in the 413-456 cm −1 region due to a (Cu-O) in the spectra of the complexes [16][17][18]. The (NH) band of the imino group is observed at 3369 cm −1 in the IR spectrum of HL and this band disappears in the spectra of the complexes, providing a strong evidence for the ligand coordination around copper(II) ion in the deprotonated form [15].…”

Section: Infrared Spectral Studiessupporting

confidence: 60%

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 Studiessupporting

confidence: 60%

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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“…The axial symmetry parameter ( ) values of the complexes (greater than 4) suggest that there are no interactions between the copper centres in DMSO medium. The empirical factor (= || / || ) cm −1 is a measure of deviation from idealized geometry [43]. Values from 165 to 171 cm −1 for the present complexes suggest a moderate to considerable distortion in the geometry.…”

Section: Characterization Of the Metal Complexesmentioning

confidence: 71%

Synthesis, Characterization, and Antibacterial Activity of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) Complexes of Schiff's Base Type Ligands Containing Benzofuran Moiety

Reddy

Shankara²,

Krishana

et al. 2013

International Journal of Inorganic Chemistry

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Six new complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) with substituted benzofuran derivatives have been synthesized and characterized by elemental analysis, magnetic moments, conductance measurements, spectral characterization, and so forth. Elemental data coincide with the general formula MLC1n, where L = (E)-7-Methoxy-N1-(2,4,5-trimethoxy benzylidene) benzofuran-2-carbohydrazide (L1) or (E)-N1-(2,6-dichloro benzylidene)-7-methoxy benzofuran-2-carbohydrazide (L2), of the complexes. The ligands coordinate to the metal ions through the oxygen of the carbonyl group and the nitrogen of the hydrazine group. Electronic spectral data of the complexes suggests the probable geometry is octahedral in nature. All the complexes and ligands were screened for their antibacterial activity. Among them, Co, Ni, and Cu complexes of L2 showed good activity against all microbes.

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“…These potentials are shifted towards negative direction for Co(II), Ni(II) and Mn(II) complexes (∆Epa = Epa 1 -Epa 2 ) 0.0731, 0.0807 and 0.0519 V potentials differences with respectively and in cathodic peak potential are also shifted towards negative direction with 0.6044, 0.3359 and 0.0227 V potentials differences with respectively. Coordination of the ligands shifts redox potential of the ligands to negative potentials due to the electron deficient character of the metal centre and also the obtained potentials differences shows the formation of ligand to metal linkage were observed (Chikate et al, 2005). …”

Section: Cyclic Voltammetric Studiesmentioning

confidence: 91%

Synthesis, spectral aspects and biological activities of 5-hydroxy-2-nitrobenzaldehydethiosemicarbazone and their Mn(II), Co(II) and Ni(II) complexes

Reddy¹,

Prathima²,

Saraswathi³

et al. 2016

J App Pharm Sci

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The ligation behavior of 5-hydroxy-2-nitrobenzaldehydethiosemicarbazone (L) and its Mn(II), Co(II) and Ni(II) complexes has been synthesized and characterized by Elemental analysis, Electronic, FT-IR, Raman, EPR spectral techniques and Cyclic voltammetric study. The ligand (L) belongs to triclinic system with P1 space group. The IR spectral data of ligand indicate the taking part of sulphur and azomethine nitrogen in coordination to the central metal ion. The electronic, FT-IR and EPR spectral studies reveals all the complexes are distorted octahedral geometry. The synthesized ligand and its metal(II) complexes were tested for their antioxidant activity by 2, 2-diphenyl-1-picrylhydrazyl (DPPH) method and antibacterial activity against E.coli, Staphylococcus aureus, Bacillus subtilis, Salmonella typhi and Klebsiella pneumonia. The antibacterial and antioxidant activities of the ligand and its metal complexes had shown moderate to good activity, among all the compounds Ni(II) complex had shown more activity.

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Transition metal quinone–thiosemicarbazone complexes 1: Evaluation of EPR covalency parameters and redox properties of pseudo-square-planar copper(II)–naphthoquinone thiosemicarbazones

Cited by 73 publications

References 53 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, Characterization, and Antibacterial Activity of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) Complexes of Schiff's Base Type Ligands Containing Benzofuran Moiety

Synthesis, spectral aspects and biological activities of 5-hydroxy-2-nitrobenzaldehydethiosemicarbazone and their Mn(II), Co(II) and Ni(II) complexes

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