scholarly journals Solvent-dependent synthesis and mono-hydrolysis of di-Schiff base of (+/-)trans-1,2-cyclohexanediamine and 2-pyridinecarboxaldehyde in Cu(II), Co(II) and Zn(II) complexes

2012 ◽  
Vol 77 (11) ◽  
pp. 1589-1597 ◽  
Author(s):  
Maryam Lashanizadegan ◽  
Marzieh Sarkheil
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Schiff Base Ligand ◽  
Nmr Spectra ◽  
Tridentate Ligand ◽  
Partial Hydrolysis ◽  
Ft Ir ◽  
Hydrolysis Of

The Schiff base ligand trans-N,N?-bis[2-pyridinecarboxylidene] cyclohexane-1,2-diamine (L) was synthesized. This ligand when stirred with 1 equiv of MCl2.xH2O (M = Cu, Co, Zn) in ethanol, undergoes partial hydrolysis of the imino bond and the result tridentate ligand (L') and immediately forms the complexes with N3 coordination sphere. The reactions of L with MCl2.xH2O (M = Cu, Co, Zn) in THF give complexes [ML]Cl2. The ligand (L), complexes [M(L')Cl]Cl and [ML]Cl2 were characterized by elemental analysis, UV-Vis, FT-IR, 1H NMR, GC/MS and luminescence properties. The 1H NMR spectra of the ligand and its diamagnetic complexes were recorded in CDCl3 and DMSO solvents, respectively. Obtained data confirm that the donor atoms N in ligand coordinated to the metal ions. The luminescence studies show ligands and their complexes display intraligand (?- ?

Partial hydrolysis of a schiff base ligand coordinated to copper(II)

1972 ◽  
Vol 8 (1-2) ◽  
pp. 55 ◽  
Author(s):  
E.C. Lingafelter ◽  
L.C. Andrews ◽  
R.M. Kirchner ◽  
N.J. Rose ◽  
L.J. Wilson
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Partial Hydrolysis ◽  
Hydrolysis Of

scholarly journals Synthesis, Characterization and Thermal Studies of Fe(II), Co(II), Ni(II) and Cu(II) Complexes with bis-(4-benzylidenamino-phenyl)-methane Schiff base ligand

2021 ◽  
Vol 2063 (1) ◽  
pp. 012004
Author(s):  
Atared F. Hassan ◽  
Hiba H. Sabah ◽  
Afaq A. Turki
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
General Formula ◽  
Elemental Analysis ◽  
Schiff Base Ligand ◽  
Thermal Studies ◽  
Molar Conductivity ◽  
Conductivity Measurements ◽  
Infra Red ◽  
Thermal Stable

Abstract A new series of Co(II), Fe(II), Cu(II) and Ni(II) complexes of Bis–(4-benzylidenamino-phenyl)-methane (L) have been prepared and characterized. The complexes conform to general formula [CoL(H2O)3] Cl2, [FeL(H2O)5]SO4.2H2O, [CuL(H2O)5] NO3 and [NiL(H2O)3Cl2], Infra red spectra and elemental analysis reveal uni-dentate coordination of Schiff base to metal ions. Molar conductivity measurements show that complexes (I, III) behave as 2:1 electrolyte while complex (II) behave as 1:1 electrolyte. The thermal studies for complexes shows that the complexes are thermal stable.

scholarly journals Synthesis, Characterization and Antibacterial Activity of Schiff Base, 4-Chloro-2-{(E)-[(4-Fluorophenyl)imino]methyl}phenol Metal (II) Complexes

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
F. K. Ommenya ◽  
E. A. Nyawade ◽  
D. M. Andala ◽  
J. Kinyua
Keyword(s):  
Antibacterial Activity ◽  
Schiff Base ◽  
Metal Complexes ◽  
Elemental Analysis ◽  
Schiff Base Ligand ◽  
Condensation Reaction ◽  
Molar Conductance ◽  
Diffusion Method ◽  
Elemental Analysis Data ◽  
Ft Ir

A new series of Mn (II), Co (II), Ni (II), Cu (II), and Zn (II) complexes of the Schiff base ligand, 4-chloro-2-{(E)-[(4-fluorophenyl)imino]methyl}phenol (C13H9ClFNO), was synthesized in a methanolic medium. The Schiff base was derived from the condensation reaction of 5-chlorosalicylaldehyde and 4-fluoroaniline at room temperature. Elemental analysis, FT-IR, UV-Vis, and NMR spectral data, molar conductance measurements, and melting points were used to characterize the Schiff base and the metal complexes. From the elemental analysis data, the metal complexes formed had the general formulae [M(L)2(H2O)2], where L = Schiff base ligand (C13H9ClFNO) and M = Mn, Co, Ni, Cu, and Zn. On the basis of FT-IR, electronic spectra, and NMR data, “O” and “N” donor atoms of the Schiff base ligand participated in coordination with the metal (II) ions, and thus, a six coordinated octahedral geometry for all these complexes was proposed. Molar conductance studies on the complexes indicated they were nonelectrolytic in nature. The Schiff base ligand and its metal (II) complexes were tested in vitro to evaluate their bactericidal activity against Gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa) and Gram-positive bacteria (Bacillus subtilis and Staphylococcus typhi) using the disc diffusion method. The antibacterial evaluation results revealed that the metal (II) complexes exhibited higher antibacterial activity than the free Schiff base ligand.

Multidentate chelating agents from Quinoline-8-aldehyde. I. Tridentate and quadridentate Schiff bases from primary diamines

1966 ◽  
Vol 19 (12) ◽  
pp. 2241 ◽  
Author(s):  
J Dekkers ◽  
HA Goodwin
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Schiff Bases ◽  
Copper Complexes ◽  
Chelating Agents ◽  
Steric Effects ◽  
Partial Hydrolysis ◽  
Trigonal Bipyramidal ◽  
Hydrolysis Of

Complexes of 1,2-bis(8-quinolylmethyleneimino)ethane with cobalt(II), nickel(II), and copper(II) are described. The copper complexes are five-covalent and, it is suggested, trigonal bipyramidal. Reaction of the Schiff base with iron(II), cobalt(III), and, under certain conditions, nickel(II) leads to its partial hydrolysis, and complexes of the tridentate 1-amino-2-(8-quinolylmethyleneimino)ethane are obtained. The hydrolysis of the Schiff base in the presence of metal ions is discussed in terms of steric effects within the base and of the stereochemical demands of the metal ions. Complexes of 1,2-bis(8-quinolylmethyleneimino)benzene and its hydrolysis derivative 1-amino-2-(8-quinolylmethyleneimino)ethane are also described.

scholarly journals Crystal structures of the bis-bidentate N2S2 Schiff base ligand and its copper(I) coordination polymer

2019 ◽  
Vol 38 (2) ◽  
pp. 207
Author(s):  
Aliakbar Dehno Khalaji ◽  
Seyyed Javad Peyghoun ◽  
Michal Dusek ◽  
Monika Kucerakova ◽  
Alireza Akbari ◽  
...  
Keyword(s):  
Schiff Base ◽  
Coordination Polymer ◽  
Elemental Analysis ◽  
Schiff Base Ligand ◽  
Bidentate Ligand ◽  
X Ray Diffraction ◽  
Trans Conformation ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Anti Form

A new flexible bis-bidentate N2S2 Schiff base ligand (2,4-Cl-ba)2dapte = N,Nʹ-bis-(2,4-dichlorobenzaldehyde)-1,2-di(o-iminophenylthio)ethane and its copper(I) coordination polymer [Cu2(μ-I)2(μ-(2,4-Cl-ba)2dapte)]n, were synthesized and characterized by CHN elemental analysis, FT-IR and UV-Vis spectroscopy and single-crystal X-ray diffraction. The molecule of (2,4-Cl-ba)2dapte adopts a trans conformation of the 1,2-di(o-iminophenylthio)ethane unit. The (2,4-Cl-ba)2dapte acts as a bis-bidentate ligand with two iminic nitrogen and two sulfur atoms, coordinating to copper(I) ions in an anti-form leading to the dinuclear Cu2(μ-(2,4-Cl-ba)2dapte) groups. These groups are then bridged by two iodide anions to form a copper(I) coordination polymer [Cu2(μ-I)2(μ-(2,4-Cl-ba)2dapte)]n. The coordination geometry around the copper(I) ions is a distorted tetrahedron. Finally, a nano-sized form of the copper(I) coordination polymer [Cu2(μ-I)2(μ-(2,4-Cl-ba)2dapte)]n was prepared by an ultrasonic bath assisted process and characterized by elemental analysis, FT-IR and SEM.

Synthesis and Biological Evaluation of a New Schiff Base and its Cu(II) Complex

2017 ◽  
Vol 68 (3) ◽  
pp. 586-588
Author(s):  
Gladiola Tantaru ◽  
Antonia Poiata ◽  
Nela Bibire ◽  
Alina Diana Panainte ◽  
Mihai Apostu ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Schiff Base ◽  
Elemental Analysis ◽  
Schiff Base Ligand ◽  
Biological Evaluation ◽  
Gram Negative Bacteria ◽  
Bacterial Strains ◽  
Gram Negative ◽  
Ft Ir ◽  
Synthesis And Biological Evaluation

A new Schiff base ligand, N-hydroxy-N�-salicylidene-urea was synthesized through the condensation of salicylaldehyde with hydroxyurea. The copper(II) complex of the Schiff base has been also obtained. Their structure has been proven using spectral methods such as UV-Vis, FT-IR, 1H-NMR and elemental analysis. The antimicrobial activity of the copper(II) complex was evaluated through comparison to the activity of the Schiff base on various bacterial strains. All tested compounds were very active against both gram-positive and gram-negative bacteria.

scholarly journals Synthesis and Characterization of New Bidentate Schiff Base Ligand Type (NO) Donor Atoms Derived from Isatin and 3-Amino Benzoic Acid and Its Complexes with Co(II), Cu(II), Cd(II) and Hg(II) Ions

2017 ◽  
Vol 30 (3) ◽  
pp. 158
Author(s):  
Heam Hadi Alkam
Keyword(s):  
Schiff Base ◽  
Benzoic Acid ◽  
1H Nmr ◽  
Schiff Base Ligand ◽  
Chloride Content ◽  
No Donor ◽  
Imine Group ◽  
Bidentate Schiff Base Ligand ◽  
Ft Ir ◽  
Amino Benzoic Acid

New bidentate Schiff base ligand (L) namely [(Z)-3-(2-oxoindolin-3ylildeneamino)benzoic acid] type (NO) was prepared via condensation of  isatin and 3-amino benzoic acid in ethanol as a solvent in existence of drops of (glac. CH3COOH). The new ligand (L) was characterized base on elemental microanalysis, FT-IR, UV-Vis, 1H-NMR spectra along with melting point. Ligand complexes in general formula [M(L)2Cl2]. H2O, where: MII = Co, Cu, Cd, and Hg; L= C15H10 N2O3 were synthesized and identified by FT-IR, UV-Vis, 1H-NMR (for Cd complex only) spectra, atomic absorption, chloride content along with molar conductivity and magnetic susceptibility. It was found that the ligand behaves as bidentate on complexation via (N) atom of imine group and (O) atom of carbonyl group of five member ring. The electronic spectral data and µeff values (Co, Cu) of the complexes exhibited octahedral geometry around CoII, CuII, CdII, HgII metal ions. The results of antibacterial activity showed that only Hg(II) complex has high activity (35 mm) for staphylococcus aureas.

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