Linkage isomerism of the oximato group: The characterization of some mono- and binuclear square planar nickel(II) complexes of vicinal oxime-imine ligands

Aly, Mohamed; Baghlaf, A.O.; Ganji, Nirmala

doi:10.1016/s0277-5387(00)84123-6

Cited by 36 publications

(17 citation statements)

References 23 publications

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“…The observed magnetic moment of this complex is typical for a tetrahedral complex. The spectrum of the Co(II) complex displayed bands characteristic of tetrahedral Co(II) complexes [22]. The magnetic moment was consistent with the tetrahedral environment around Co(II).…”

Section: Resultsmentioning

confidence: 65%

Coordination of carbonyl oxygen in the complexes of polymeric N-crotonyl-2-hydroxyphenylazomethine

Al-Jeboori

Al-Dujaili

Al-Janabi

2008

Transition Met Chem

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The Schiff base N-crotonyl-2-hydroxyphenylazomethine HL, derived from the reaction of acrylamide and salicylaldehyde, was synthesised. Polymeric complexes were obtained from the reaction of polymeric HL with divalent metals. The mode of bonding and overall geometry of the complexes were determined through physico-chemical and spectroscopic methods and compared with that previously reported for the analogous monomeric ligand. These studies revealed tetrahedral geometries around the metal centres for Mn(II), Co (II), Zn(II), Cd(II) and Hg(II) complexes of general formula [M(L)Cl], octahedral for Ni(II) and Cu(II) complexes of general formula [M 0 (L)Cl(H 2 O) 2 ], and square planar for Pd(II) complex of general formula [Pd(L)Cl].

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Section: Resultsmentioning

confidence: 65%

Coordination of carbonyl oxygen in the complexes of polymeric N-crotonyl-2-hydroxyphenylazomethine

Al-Jeboori

Al-Dujaili

Al-Janabi

2008

Transition Met Chem

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“…41,54 The shift to lower wave numbers on complexation could be due to a change in the orientation of the N-O bond with respect to H in the ligand and complexes. The complexes appear to have been stabilized by the six-membered chelate ring due to the MNOHONM or MNOMONM moiety.…”

Section: 53mentioning

confidence: 99%

Mono-, Trinuclear Nickel(ii) and Copper(ii) Dioxime Complexes: Synthesis, Characterization, Catecholase and Catalase-Like Activities, Dna Cleavage Studies

Karipçin

Dede

Özmen

et al. 2014

J. Chil. Chem. Soc.

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The synthesis and molecular structures of six new mono-and trinuclear complexes [M 1 L 2 {M 2 (phen)} 2 ](ClO 4 ) 2 [phen = 1,10-phenanthroline, H 2 L = dioxime ligand, M 1 , M 2 =Ni(II) and Cu(II)] of the ligand, 4-(4-methylphenylamino)biphenylglyoxime are reported. Structural assignments are supported by a combination of FT-IR, elemental analyses, ICP-OES, magnetic susceptibility and molar conductivity studies. Furthermore these complexes were each tested for their ability to catalyze the oxidation of catechol substrates to quinone with dioxygen at 25 o C and disproportionation of hydrogen peroxide in the presence of the added base imidazole. The catalytic results indicated that the heterotrinuclear Cu(II)Ni(II)Cu(II) complex (5) shows greater catecholase activity. On the other hand the trinuclear complexes display efficiency in disproportion reactions of hydrogen peroxide producing water and dioxygen in catalase-like activity and homotrinuclear Cu(II) (6) complex is more active towards catalytic decomposition of hydrogen peroxide. The interaction between these compounds with DNA has also been investigated by agarose gel electrophoresis, the trinuclear copper(II) complexes (5, 6) with H 2 O 2 as a cooxidant exhibited the strongest cleaving activity.

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“…[25][26][27] This observation indicates that, the carbonyl groups of the ligands and their copper(II) complexes are involved in neither hydrogen bonding in ligands nor in the coordination to the copper(II) ion in complexes. Whereas the medium band at 1590, 1625; and 1580, 1620 cm -1 may be assigned to ν(C=N) of the oxime and imine groups respectively.…”

Section: Infrared Spectramentioning

confidence: 99%

Synthesis, Characterization and ESR Studies of New Copper(II) Complexes of Vicinal Oxime Ligands

El‐Tabl¹,

Shakdofa²,

El‐Seidy³

2011

Journal of the Korean Chemical Society

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1 , (3)] react with copper(II) acetate monohydrate yield octahedral and square planar complexes, respectively. The complexes have been postulated due to elemental analyses, IR, UVVis. spectra, magnetic susceptibility, conductivity and ESR spectra. Molar conductance of the complexes in DMF indicates a non-ionic character. The ESR spectra of [(L)2Cu(H2O)2], (2) complex at room temperature and 77K are characteristic of an axial symmetry (dx2-y2) with covalent bond character and have a large line width typical of dipolar interactions. However, [(L 1 )Cu], (4) complex in the solid state showed spectra of marked broadening and loss of hyperfine splitting confirming spinexchange interactions between the copper(II) sites. The spectrum of the doped copper(II) complex at room temperature showed super-hyperfine splitting from coordinated nitrogen atoms and it has an axial type (dx2-y2) with covalent bond character and an essentially square-planar arrangement around the copper(II) ion. The spectrum of [(L 1 )Cu], (4) in frozen methanol at 77K was characteristic of the triplet state of a dimer species and the distance found between the two copper(II) centers was calculated and is equal to 4.8 Å.

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Linkage isomerism of the oximato group: The characterization of some mono- and binuclear square planar nickel(II) complexes of vicinal oxime-imine ligands

Cited by 36 publications

References 23 publications

Coordination of carbonyl oxygen in the complexes of polymeric N-crotonyl-2-hydroxyphenylazomethine

Coordination of carbonyl oxygen in the complexes of polymeric N-crotonyl-2-hydroxyphenylazomethine

Mono-, Trinuclear Nickel(ii) and Copper(ii) Dioxime Complexes: Synthesis, Characterization, Catecholase and Catalase-Like Activities, Dna Cleavage Studies

Synthesis, Characterization and ESR Studies of New Copper(II) Complexes of Vicinal Oxime Ligands

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