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Synthesis, Characterization and Redox Properties of Novel vic-Dioximes and Their Complexes with Nickel(ii), Copper(II) and Cobalt(II)

Tas E., Aslanoglu M., Kilic A., Ulusoy M ., Guler M.

Polish Journal of Chemistry

2005

Vol. 79 / nr 11

1739-1747

Two novel vic-dioxime, 1,2-dihydroxyimino-1-p-tolyl-3-aza-6-imidazole heptane (L1H2) and N-(ethyl-4-amino-1-piperidine carboxylate)-p-tolylglyoxime (L2H2) were prepared by the reaction of anti-p-tolylchloroglyoxime with 1-(3-aminopropyl)imidazole and ethyl-4-amino-1-piperidine carboxylate in absolute THF. Mononuclear complexes with a metal-ligand ratio of 1:2 were prepared using Co(II), Cu(II) and Ni(II) salts. The ligands and their Co(II), Cu(II) and Ni(II) com plexes were characterized by elemental analyses, FT-IR, UV-Vis, 1H-NMR and 13C-NMR and magnetic susceptibility measurements. The electrochemical behaviour of the complexes was investi ated by cyclic voltammetry in dimethylsulfoxide. All metal complexes showed metal centered quasi reversible one-electron redox processes. How ever, metal complexes of the L2H2 ligand also ex hibited ligand based irreversible redox waves.

Ligand-Field Analysis of Low-Spin N,N'-Propylenebis(naphthyldiiminate)nickel(II) in Ethanol Solution

Kurzak K., Gonciarz A., Kuźniarska-Biernacka I.

Polish Journal of Chemistry

2005

Vol. 79 / nr 1

47-56

Titled complex denoted as [Ni(nappn)]ź0.5H2O, where H2nappn is tetradentate Schiff base: 1,3-bis(naphthylideneimine)propane, has been characterized by elemental analysis, molar conductivity, ultraviolet (UV) and visible (Vis) spectroscopy. The known X-ray structure of this complex shows that Ni atom adopts square-planar coordination. Combined multi-technique experiments have been applied to establish the structure of complex in solution. The molar conductivity value indicates non-electrolytic properties of solution studied. The spectroscopic measurements were used to study the coordination properties of donor-atoms and their bonding abilities. All the experimental transition energies are derived from Gaussian analysis of the solution spectrum. The d-d transition energies were used to derive the angular overlap model (AOM) and crystal-field model (CFM) parameters for the studied complex inD4h symmetry. The first full ligand-field interpretation of the low-spin Schiff base nickel(II) complex in solution has been presented.

Synthesis, Characterization and Electrochemical Studies of Nickel(II) and Cobalt(II) Complexes with Novel Bidentate Salicylaldimines

Tas E., Aslanoglu M., Ulusoy M., Guler M.

Polish Journal of Chemistry

2004

Vol. 78 / nr 7

903-909

Several mononuclear Ni(II) and Co(II) complexes of bidentate salicylaldimines (LxH), derived from 3,5-di-tert-butyl-2-hydroxybenzaldehyde with biologically active amines [1-(3-aminopropyl)imidazole, 4-(3-aminopropyl)morpholine, 1-(3-aminopropyl)-2-pyrrolidinone], have been synthesized. The complexes have been characterized by FT-IR, UV-vis, MS, 1H-NMR and 13C-NMR, magnetic susceptibility measurements, thermogravimetric analyses (TGA) and electrochemistry. As a result of thermal analyses, Co(L3)2 has highest thermal stability of the complexes, whereas the smallest one has Ni(L2)2. Electrochemical experiments indicated that Ni(II) and Co(II) complexes show quasi reversible reduction to Ni(I) and Co(I), respectively.

Synthesis of 9,10-Bis(hydroxyimino)-4,8,11,15-tetraaza-1,2,17,18-O-dicyclopentylideneoctadecane and its Complexes with Co(II), Co(II) and Ni(II)

Cukurovah A., Tas E.

Polish Journal of Chemistry

1999

Vol. 73, nr 9

1457-1463

A novel dioxime 9,10-bis(hydroxyimino)-4,8,11,15-tetraaza-1,2,17,18-O-dicyclopentylideneoctadecane (LH2) was prepared by the reaction of 1,2-O-dicyclopentylidene-4-aza-7-aminoheptane and (E,E) dichloroglyoxime in THF. Mononuclear complexes with a metal-ligand ratio of 1:2 were prepared with Co(II), Cu(II) and Ni(II).