Three new vic-dioxime ligands: Synthesis, characterization, spectroscopy, and redox properties of their mononuc ear nickel(II) complexes

Ahmet Kilic, Esref Tas*, Bahattin Gumgum, Ismail Yilmaz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Nickel(II) complexes with three new vic-dioxime reagents, N-(ethyl-4-amino-1-piperidine carboxylate)phenylglyoxime (L1H 2), N-(ethyl-4-amino-1-piperidirie carboxylate)glyoxime (L 2H2) and N,N′-bis(ethyl-4-amino-1-piperidine carboxylate)glyoxime (L3H2), have been prepared. Mononuclear nickel(II) complexes with a metal/ligand ratio of 1:2 were prepared using Ni(II) salt. All these nickel(II) complexes are nonelectrolytes as shown by their molar conductivities (ΛM) in DMF solution at 10 -3 M concentration. The ligands are soluble in common solvents such as DMSO, DMF, CHCl3, and C2H5OH. The ligands and their Ni(II) complexes were characterized by elemental analyses, FT-IR, UV-visible, 1H NMR, 13C NMR, magnetic susceptibility measurements, cyclic voltammetry, and molar conductivities (Λ M). The cyclic voltammetric measurements show that [Ni(L 1H)2] and [Ni(L2H)2] complexes exhibit almost similar electrochemical behavior, with two reduction and two oxidation processes based on either metals or oxime moities, while [Ni(L 3H)2·2H2O] complex displays irreversible, with one reduction and one oxidation processes based on oxime moity. This main difference could be attributed to the highly polarized [Ni(L3H)2·2H2O] complex that has four carboxylate groups attached to piperidine on the oxime moieties.

Original languageEnglish
Pages (from-to)657-663
Number of pages7
JournalHeteroatom Chemistry
Volume18
Issue number6
DOIs
Publication statusPublished - 2007

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