The thermal behaviour of nickel, copper and zinc complexes with the Schiff bases cis- and trans-N,N′-bis(salicylidene)-1,2-ciclohexadiamine (Salcn)

Cavalheiro, Éder Tadeu Gomes; Lemos, F. C. D.; Zukerman-Schpector, Júlio; Dockal, Edward R.

doi:10.1016/s0040-6031(00)00777-2

Cited by 40 publications

(16 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The same phenomenon is observed for H 2 L2 but these two oxidation waves are located at +1.440 and +1.840 V. This ligand presents an improved resistance towards oxidation reactions due to para-bromine atoms leading to higher oxidation potential values because the para and ortho positions of the phenol moieties presents a lower electronic density. These results are very close to those reported in the literature for similar compounds [42][43][44][45].…”

Section: Ligandssupporting

confidence: 92%

“…These two irreversible waves are attributed to the para and ortho oxidations of the phenol moieties and of the phenol groups themselves [42]. The same phenomenon is observed for H 2 L2 but these two oxidation waves are located at +1.440 and +1.840 V. This ligand presents an improved resistance towards oxidation reactions due to para-bromine atoms leading to higher oxidation potential values because the para and ortho positions of the phenol moieties presents a lower electronic density.…”

Section: Ligandsmentioning

confidence: 53%

See 1 more Smart Citation

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

Ourari¹,

Ouari²,

Moumeni³

et al. 2006

Transition Met Chem

View full text Add to dashboard Cite

Salicylaldehyde or 5-bromosalicylaldehyde reacted with 2,3-diaminophenol in absolute EtOH in a 2:1 molar ratio to give new unsymmetrical Schiff bases (H 2 L). The bases were used as ligands to coordinate Mn(III), Ni(II) and Cu(II) chlorides leading to [Mn III ClL] AE EtOH and [M II L] or [M II L] AE 2H 2 O (M=Ni or Cu) complexes. Their structures were determined using mass spectroscopy, IR, u.v.-vis and 1 H-n.m.r. The cyclic voltammetry in acetonitrile showed irreversible waves for both ligands. Under the same experimental conditions, the complexes exhibited mainly the non-reversible reduction of the Ni(II) or Cu(II) ion to Ni(0) or Cu(0), while the reduction of Mn(III) to Mn(II) was found to be a quite reversible phenomenon.

show abstract

Section: Ligandssupporting

confidence: 92%

Section: Ligandsmentioning

confidence: 53%

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

Ourari¹,

Ouari²,

Moumeni³

et al. 2006

Transition Met Chem

View full text Add to dashboard Cite

show abstract

“…The displacement of C = N stretching frequencies from 1615 -1631 cm -1 in the free Schiff base ligands to lower values of 1606 -1611 cm -1 in the complexes indicating the coordination of azomethine nitrogen to the palladium metal. This result shows that the contribution of C = N stretching mode has been reduced as the electron pairs on a nitrogen atom is involved in bond formation with the palladium ion [4]. Besides, the broad OH band at >3400 cm -1 in the free Schiff base ligands spectrum has totally disappeared in complexes spectrum, suggesting the strong participation of the OH group in chelate formation to the palladium atom via the deprotonation of phenolic hydrogen [5].…”

Section: Fourier Transform Infrared (Ftir)mentioning

confidence: 85%

“…In this study, four types of bases have been used; Et 3 N, KF, K 2 CO 3 and K 3 PO 4 , in order to study the effect of bases towards the percentage conversion of iodobenzene. The type of bases was chosen based on their performance in Suzuki reaction to form similar biphenyl products [10,11].…”

Section: Effect Of Basesmentioning

confidence: 99%

Symmetrical Palladium (II) N,N,O,O-Schiff Base Complex: Efficient Catalyst for Heck and Suzuki Reactions

Ibrahim¹,

Shamsuddin²

2012

CSTA

View full text Add to dashboard Cite

Palladium is arguably the most versatile and most widely applied catalytic metal in the field of fine chemicals due to its high selectivity and activity. Palladium catalyst offers an abundance of possibilities of carbon-carbon bond formation in organic synthesis. In this research, three different Schiff base ligands have been prepared by condensation reaction between appropriate aldehyde or ketone with amine namely 2,2-dimethyl-1,3-propanediamine in the molar ratio of 2:1. The corresponding palladium (II) Schiff base complexes were prepared through the reaction between the Schiff base ligand with palladium (II) acetate in a molar ratio 1:1. FTIR, 1 H-NMR and 13 C-NMR spectroscopic data revealed that the ligands are N,N,O,O-tetradentate coordinated to the Pd atom through both the azomethine N atoms and phenolic O atoms. From X-ray Crystallographic analysis, it showed that the complex exists as square planar geometry. The synthesized palladium (II) Schiff base complexes were then subjected in catalytic Heck and Suzuki reaction of iodobenzene.

show abstract

“…Thermal studies: The ligand and its metal complexes have thermal properties are examined from ambient temperature up to 700 °C in nitrogen atmosphere [54,55]. The results of thermogravimetry of ligand and metals complexes are listed in Table-5.…”

Section: H Nmr Spectramentioning

confidence: 99%

Synthesis, Spectral, Thermal and Biological Studies of Some Metal Complexes Derived from Heterocyclic Mono Azo Dye Ligand 2'[(2'-Hydroxy-4-methyl phenyl)azo]imidazole

Al-Adilee¹,

Atyha²

2018

Asian J. Chem.

View full text Add to dashboard Cite

Asian Journal of Chemistry; Vol. 30, No. 2 (2018), 280-292 in the azo dyes compounds, such as hydroxyl, carboxylic acid, halogens, esters and amines [19,20]. An important uses of azo imidazole compounds used analytical reagents for solvent extraction to determination of some metal ions [21,22]. The heterocyclic azo imidazole compounds have important role in spectral determination field to determine the trace amount of elements especially transition metal ions and heavy metals because of high sensitivity and selectivity [23,24].The present work describes the synthesis and spectral characterizations of 2'[2'-(1-hydroxy-4-methyl phenyl)azo]-imidazole (HMePAI = HL), containing phenolic-OH function and imidazole moiety. The heterocyclic mono azo dye ligand and its metal complexes were studied by various spectral analysis and screened for their biological activities. As well as the study of ligand and Ni(II) complex of prescription drug anticancer by using the lines of cancerous liver cells of the type HePG2 and compared with line of the ordinary cells.

show abstract

The thermal behaviour of nickel, copper and zinc complexes with the Schiff bases cis- and trans-N,N′-bis(salicylidene)-1,2-ciclohexadiamine (Salcn)

Cited by 40 publications

References 14 publications

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

Symmetrical Palladium (II) N,N,O,O-Schiff Base Complex: Efficient Catalyst for Heck and Suzuki Reactions

Synthesis, Spectral, Thermal and Biological Studies of Some Metal Complexes Derived from Heterocyclic Mono Azo Dye Ligand 2'[(2'-Hydroxy-4-methyl phenyl)azo]imidazole

Contact Info

Product

Resources

About