Electrochemistry of nickel(II) complexes with N,N'-bis(3,5-di-tert-butylsalicylidene)polymethylenediamines

Ozalp-Yaman, S
Kasumov, VT
Önal, Ahmet Muhtar
The electrochemical oxidation of several N,N'-polymethylenebis(3,5-di-tert- butylsalicylaldiminato)nickel(II) complexes, Ni(L-x), has been studied by cyclic voltammetry and in situ UV-Vis spectroscopy in DMF Cyclic voltammograms of Ni(L-x) (x = 1-4) complexes displayed two-step oxidation processes under nitrogen gas atmosphere. The first oxidation peak potentials of all the Ni(II) complexes corresponds to the reversible one-electron oxidation process of the metal center, yielding Ni(III) species. EPR spectrum of the electrolysis solution was recorded after one electron transfer at liquid nitrogen temperature also confirms the formation of [Ni-III (L-3)](+) species (g(x) > g(y) > g(z)) with a (2)A(1)(d(z)(2))(1) ground state. Upon addition of pyridine to one electron oxidised solutions a new penta coordinated species, [Ni-III(L-3)Py](+) (g(perpendicular to) > g(parallel to), a(parallel to)(N-14) = 8 G), was produced. The second oxidation peak of the complexes was assigned as the ligand based oxidation, generating a coordinated phenoxy radical species.


Axial water substitution kinetics of sulphato- and hydrogenphosphato-bridged binuclear platinum(III) complexes
Camadanli, S; Deveci, N; Gokagac, G; Isci, H (Elsevier BV, 2003-07-22)
The kinetics of the axial water substitution reactions for [Pt-2(B-B)(4)(H2O)(2)](2-) (B-B = SO42-, HpO(4)(2-)) with Cl-, Br- and SCN- are reported in acidic aqueous solution. With a large excess of entering ligand and hydrogen ion, only the disubstituted product complex was formed. The reaction rates are first order with respect to the substrate complex and entering ligand and decrease with increasing H+ concentration. In the presence of 0.10 M H+, the rate constants for the replacement of the first water ...
GOKAGAC, G; ISCI, H; MASON, WR (American Chemical Society (ACS), 1992-05-27)
Electronic absorption and 7-T magnetic circular dichroism (MCD) spectra in the UV-visible region are reported for the binuclear diplatinum(III) ions: Pt2(SO4)4X2n-, n = 2, X = H2O, NH3; n = 4, X = Cl-, Br-, OH-. Pt2(HPO4)4X2n-, n = 2, X = H2O, Me2S; n = 4, X = Cl-, Br-. Both the absorption spectra and the MCD spectra for complexes with the same axial ligand X are similar for oxo-bridging SO42- or HPO42-. However, the MCD spectra show marked differences depending upon the nature of the X ligand. The mos...
Synthesis of ferrocenyl pyrazoles by the reaction of (2-formyl-1-chlorovinyl)ferrocene with hydrazines
Zora, Metin (Elsevier BV, 2007-10-15)
Synthesis of ferrocenyl-substituted pyrazoles via the reaction between (2-formyl-1-chlorovinyl)ferrocene and hydrazine derivatives is described. Depending upon the substitution pattern of hydrazine, the reaction affords 1-alkyl/aryl-5-ferrocenylpyrazoles and/or 1-alkyl/ aryl-3-ferrocenylpyrazoles. The reaction appears to be general for a variety of hydrazine derivatives.
Voltammetric methods of reboxetine analysis and the mechanism of its electrode reactions
Altunöz Erdoğan, Deniz; Erk, Nevin; Kilic, Esma (Walter de Gruyter GmbH, 2013-05-01)
Reboxetine (RBX) electrochemical redox behavior at hanging mercury drop (HMDE) and glassy carbon electrodes (GCE) was studied in various pH Britton-Robinson universal buffers using cyclic voltammetry and square-wave voltammetry. RBX was reduced at the HMDE and oxidized at the GCE with reversible adsorption controlled and irreversible diffusion controlled processes respectively. The anodic peak is due to the amine and the cathodic peak may correspond to oxygen protonation. An oxidation reaction mechanism is ...
Electronic absorption and MCD spectra for octacyanometallate complexes M(CN)(8)(n-), M = Mo(IV), W(IV), n=4 and Mo(V), W(V), n=3
Isci, H; Mason, WR (Elsevier BV, 2004-11-15)
Electronic absorption and 8.0 T magnetic circular dichroism (MCD) spectra are reported for M(CN)(8)(4-), M = Mo(IV) and W(IV), in aqueous solution and M(CN)(8)(3-), M = Mo(V) and W(V), in acetonitrile solutions. In addition some absorption and MCD spectra are reported for the M(CN), 3- ions embedded in thin poly methyl methacrylate (PMMA) plastic films at temperatures from 295 to 10 K. The temperature dependence of the MCD spectra confirms the presence of C terms. The solution and PMMA spectra for the both ...
Citation Formats
S. Ozalp-Yaman, V. Kasumov, and A. M. Önal, “Electrochemistry of nickel(II) complexes with N,N’-bis(3,5-di-tert-butylsalicylidene)polymethylenediamines,” POLYHEDRON, pp. 1821–1828, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36435.