Synthesis, spectroscopic and electrochemical study of nickel-(II) and -(I) complexes with Schiff-base ligands giving a NN′OS co-ordination sphere

Pereira, Eulália; Gomes, Lígia R.; Castro, Baltazar de

doi:10.1039/a705685k

Cited by 37 publications

(9 citation statements)

References 25 publications

(24 reference statements)

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“…The same trends were found for cobalt(II) and nickel(II) Salen complexes [13]. The reduction process of Ni(II) complexes occurs at more negative direction relative to other metal ions because d 8 is the best electron configuration for the square planar complexes, while the deviation from this electron configuration causes some instabilities in planar complexes with tetradentate Schiff base ligands [17,45]. The higher reduction potentials may arise from the deviations in the structure of nickel complexes by the reduction of Ni(II) to Ni(I) (d 8 to d 9 electron configuration).…”

Section: The Effect Of Metals On Reduction Potentialssupporting

confidence: 55%

Synthesis and electrochemistry of M(II) N2O2 schiff base complexes: X-Ray structure of {Ni[Bis(3-chloroacetylacetone)ethylenediimine]}

Kianfara

Zargari

Khavasi

2010

JICS

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The synthesis and characterization of [Ni(BCE)] and [Cu(BCE)] (where BCE = bis(3-chloroacetylacetone)ethylenediimine) are described. The coordination geometry of [Ni(BCE)] was determined by X-ray crystallography. It was found to be planar and four coordinate in the solid state. The electrochemical properties of M(Chel), where M = Co(II), Ni(II) and Cu(II), and Chel = BAE (bis(acetylacetone)ethylenediimine), BBE = bis(benzoylacetone)ethylenediimine, BFE (bis(1,1,1-triflouroacetylacetone) ethylenediimine and BCE ligands were investigated in DMF and DMSO as solvents. The oxidation potentials changed from left to right in the periodic table in the trend: Co < Ni < Cu, while the reduction potentials changed according to the trend: Ni > Co > Cu. The oxidation potentials of M(II) to M(III) (M = Ni and Cu) increased according to the Schiff base ligands in the trend: BAE < BBE < BCE < BFE, while the reduction potentials followed a reverse trend: BAE > BBE > BCE > BFE. The oxidation potentials of M(II) to M(III) increased according to the solvent in the trend: DMSO < DMF.

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Section: The Effect Of Metals On Reduction Potentialssupporting

confidence: 55%

Synthesis and electrochemistry of M(II) N2O2 schiff base complexes: X-Ray structure of {Ni[Bis(3-chloroacetylacetone)ethylenediimine]}

Kianfara

Zargari

Khavasi

2010

JICS

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“…The E 1/2 values for the complexes decrease with increase in chain length and they are found to be 0.92, 0.91 and 0.84 V for [Ni(MABCE)], [Ni(MABCP)] and [Ni(MABCT)], respectively. The reduction process of Ni(II) complexes occurs at more negative potentials in the range of À1.50 to À1.56 V. The reduction of Ni 2+ yields a large reduced Ni + cation with a highly distorted square planar environment, which is not stabilized by the open chain ligands [26].…”

mentioning

confidence: 99%

Synthesis, spectral, thermal and electrochemical studies of nickel (II) complexes with N2O2 donor ligands

Anthonysamy

Balasubramanian

2005

Inorganic Chemistry Communications

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“…region and half-field absorption are observed. This type of spectrum was reported earlier for complexes bearing large organic ligand substituents having covalent metal-ligand bonds [22]. In this case, the higher covalency of sulfur-metal bond and the lower spin-orbit coupling of sulfur ligand may be the main factors affecting the EPR spectrum.…”

Section: Epr Spectral Analysismentioning

confidence: 76%

“…It is presumed that the higher covalency of Cu-S bond and low spin-orbit coupling of sulfur is responsible for the decrease in the effective magnetic moment values [21,22].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Ligational behavior of S, N, and O donor quinoxaline derivatives toward the later first-row transition metal ions

Kulkarni

Bevinahalli

Revankar

2010

Journal of Coordination Chemistry

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Ligands derived from quinoxaline-2,3-(1,4H)-dithione are treated with Co(II), Ni(II), Cu(II), and Zn(II) chlorides to yield stable complexes. The prepared compounds are characterized by spectro-analytical techniques and magnetic susceptibility measurements, and the coordination behavior of ligands is discussed. All the complexes are octahedral and mononuclear with general formula [MLCl 2 (H 2 O)]. The electrochemical behavior of the synthesized compounds was investigated by cyclic voltammetry studies and the redox activity is explained.

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Synthesis, spectroscopic and electrochemical study of nickel-(II) and -(I) complexes with Schiff-base ligands giving a NN′OS co-ordination sphere

Cited by 37 publications

References 25 publications

Synthesis and electrochemistry of M(II) N2O2 schiff base complexes: X-Ray structure of {Ni[Bis(3-chloroacetylacetone)ethylenediimine]}

Synthesis and electrochemistry of M(II) N2O2 schiff base complexes: X-Ray structure of {Ni[Bis(3-chloroacetylacetone)ethylenediimine]}

Synthesis, spectral, thermal and electrochemical studies of nickel (II) complexes with N2O2 donor ligands

Ligational behavior of S, N, and O donor quinoxaline derivatives toward the later first-row transition metal ions

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