Erdal Canpolat

SYNTHESIS AND CHARACTERIZATION OF A VIC-DIOXIME DERIVATIVE AND INVESTIGATION OF ITS COMPLEXES WITH Ni(II), Co(II), Cu(II) AND UO2(VI) METALS

In this study, 1,2-dihdroxyimino-3,7-di-aza-9,10-O-iso-propylidene decane (LH2 ) was synthesized starting from 1,2-O-iso-propylidene-4-aza-7-aminoheptane (RNH2 ) and anti-chloroglyoxime. Complexes of this ligand with Ni(II), Co(II), Cu(II) and UO2(VI) salts were prepared. Structures of the ligand and its complexes are proposed based on elemental analyses, IR, 13C and 1H NMR spectra magnetic susceptibility measurements and thermogravimetric analyses (TGA).

Synthesis and Characterization of Ni(II), Cu(II), Zn(II) and Cd(II) Complexes of a New Vic-Dioxime Ligand

In this study, 1,2-dihydroxyimino-3,7-di-aza-9,10-O-α-methyl benzal decane (LH2) was synthesized starting from 1,2-O-α-methyl benzal-4-aza-7-amino heptane (RNH2) and antichloroglyoxime. With this ligand, complexes were synthesized using Ni(II) and Cu(II) salts with a metal:ligand ratio of 1:2. However, the reaction of the ligand with salts of Zn(II) and Cd(II) gave products with metal:ligand ratio of 1:1. Structures of the ligand and its complexes are proposed based on elemental analyses, IR, 13C- and 1H-NMR spectra, magnetic susceptibility measurements and thermogravimetric analyses (TGA).

Mononuclear Chelates Derived from Substituted Schiff Base Ligands: Synthesis and Characterization of a New 3‐Methoxysalicyliden‐p‐Aminoacetophenoneoxime and its Complexes with Co(II), Ni(II), Cu(II), and Zn(II)

Abstract A new Schiff base ligand, 3‐methoxysalicyliden‐p‐aminoacetophenoneoxime (LH), was synthesized starting from p‐aminoacetophenoneoxime and 3‐methoxysalicylaldehyde. Complexes of this ligand with Co+2, Ni+2, Cu+2, and Zn+2 salts were prepared. With this ligand, complexes were synthesized using Co+2, Ni+2, Cu+2, and Zn+2 salts with a metal:ligand ratio of 1:2. Structures of the ligand and its complexes were proposed based on elemental analyses, IR, 1H‐ and 13C‐NMR, electronic spectra, magnetic susceptibility measurements, molar conductivity, and thermogravimetric analyses (TGA).

The synthesis and characterization of N-{2-[(1,4-dioxaspiro[4.5]- dec-2-ylmethyl)amino]ethyl}-N′-hydroxy-2-(hydroxyimino)ethanimidamide and some of its transition metal complexes

A new soluble vic-dioxime, N-{2-[(1,4-dioxaspiro[4.5]dec-2-ylmethyl)amino]ethyl}-N′-hydroxy-2-(hydroxyimino)ethanimidamide (LH2 ) has been synthesized and mononuclear complexes have been obtained with Co(II), Ni(II), Cu(II) and Zn(II) salts. Different types of metal complexes, such as [Co(LH)2(H2O)2], [M(LH)2] (M = Ni(II) and Cu(II)) and [Zn(LH)(Cl)(H2O)], were obtained. Co(II), Ni(II) and Cu(II) form complexes with LH2 which have a metal ligand ratio of 1 : 2. Zn(II) forms a complex with H2L which has a metal–ligand ratio of 1 : 1. Structures of these compounds were identified by using elemental analyses, IR, 1H and 13C NMR spectra, electronic spectra, magnetic susceptibility measurements, conductivity measurements and thermogravimetric analyses (TGA).

Synthesis and formation of a new vic-dioxime complexes

In this study, N-(4-{[(2-ethyl-2-methyl-1,3-dioxolan-4-yl)methyl]amino}butyl)-N′-hydroxy-2-(hydroxyimino)ethanimidamide (L1H2) and N′-hydroxy-2-(hydroxyimino)-N-(4-{[(2-methyl-2-phenyl-1,3-dioxolan-4-yl)methyl]amino}butyl)ethanimidamide (L2H2) were synthesized by the reaction of N-[(2-ethyl-2-methyl-1,3-dioxolan-4-yl)methyl]butane-1,4-diamine or N-[(2-methyl-2-phenyl-1,3-dioxolan-4-yl)methyl]butane-1,4-diamine and anti-chloroglyoxime. Ligands form mononuclear complexes [(LH)2M] with a metal : ligand ratio of 1 : 2 with M = Co(II)(H2O)2, Ni(II) and Cu(II). Zn(II) forms complexes [(LH)(H2O)(Cl)Zn] with a metal : ligand ratio of 1 : 1. The Co(II) complexes of the ligands are proposed to be octahedral with water molecules as axial ligands, the Ni(II) and Cu(II) complexes are proposed to be square planar, and the complexes of Zn(II) are tetrahedral. A chloride ion and a water molecule are also coordinated to the Zn(II) ion. Structural assignments are supported by elemental analyses, IR, 1H- and 13C-NMR spectra, UV–Visible spectroscopy, molar conductivity, magnetic susceptibility measurements and thermogravimetric analyses (TGA).

Synthesis and Characterization of Two vic-Dioximes Containing the 1,3-Dioxolane Ring and 1,4-Diaminobutane and Their Cobalt(II), Nickel(II), Copper(II) and Zinc(II) Metal Complexes

Two new vic-dioxime ligands, (E,E)-N-{4-[(1,4-dioxaspiro[4.4]non-2-ylmethyl)amino]butyl}-N′-hydroxy-2-(hydroxyimino)ethanimidamide (L1H2) and (E,E)-N-{4-[(1,4-dioxaspiro[4.5]dec-2-ylmethyl)amino]butyl}-N′-hydroxy-2-(hydroxyimino)ethanimidamide (L2H2) containing two different heteroatoms (N,O) have been prepared from anti-chloroglyoxime, N-(1,4-dioxaspiro[4.4]non-2-ylmethyl)butane-1,4-diamine (3) and N-(1,4-dioxaspiro[4.5]dec-2-ylmethyl)butane-1,4-diamine (4). CoII, NiII and CuII complexes of the ligands have a metal:ligand ratio of 1:2 and the ligands coordinate through the two N atoms, as do most of the vic-dioximes. However, ZnII complexes of the ligands have a metal:ligand ratio of 1:1 and the ligands are coordinated only by the N, O atoms of the vic-dioximes. In the CoII complexes two water molecules, and in the ZnII complexes a chloride ion and a water molecule, are also coordinated to the metal ion. The structures of the compounds were determined by a combination of elemental analysis, magnetic moments, molar conductances, thermogravimetric analysis (t.g.a.) and spectroscopic (u.v.–vis., i.r., 1H- and 13C-n.m.r.) data.

Design, synthesis, characterization and antibacterial and antifungal activity of a new 2-{(E)-[(4-aminophenyl)imino]-methyl}-4,6-dichlorophenol and its complexes with Co(II), Ni(II), Cu(II) and Zn(II): An experimental and DFT study

In this study, the complexes of Co (II), Ni (II), Cu (II) and Zn (II) with 2-(E)-(4-aminophenylimino)methyl-4,6-dichlorophenol were prepared and characterized by physical, spectral and analytical data. The metal: ligand stoichiometric ratio is 1:2 in all the complexes. The results suggested that the Schiff bases are coordinated to the metal ions through the phenolic oxygens and azomethine nitrogen to give mononuclear complexes. Their structures were elucidated on the basis of elemental analysis, IR, 1H and 13C NMR spectra, UV-VIS, magnetic susceptibility measurements and thermogravimetric analyses. Both the antibacterial and antifungal activities and MIC values of compounds were reported. Among the tested compounds, the most effective compound providing a MIC value of 64 μg/mL is Zn(L)2 against C. tropicalis and B. subtilis. The theoretically optimized geometries of complexes have tetrahedral structures. The computed stretching frequencies of C=N, C-O and N-H bonds were found to be in good agreement with experimental data. All calculated frequencies fall within about 5% of the experimental frequency regions.

Synthesis and Characterization of a New 2-{(E)-[(4-aminophenyl)imino]methyl}-6-bromo-4-chlorophenol and Its Complexes with Co (II), Ni (II), Cu (II), and Zn (II): An Experimental and DFT Study

The complexes of Co, Ni, Cu and Zn with 2-{(E)-[(4-aminophenyl)imino]methyl}-6-bromo-4-chlorophenol were prepared and characterized by physical, spectral, and analytical data. The metal:ligand stoichiometric ratio is 1:2 in all the complexes produced. The bidentate behavior of the ligand was accomplished via the phenolic oxygen and the azomethine nitrogen atoms. Suitable structures have been proposed for the complexes synthesized. The theoretically optimized geometries of complexes have tetrahedral structures. The stretching frequencies of C˭N, C‒O, and N‒H were computed to be in good agreement with experimental data. All calculated frequencies fall within 2% of the experimental frequency regions.