Synthesis, characterization, thermal, and redox properties of a vic-dioxime and its metal complexes

Abstract

A new vic-dioxime ligand containing benzophenone hydrazone units, N 0 -(benzophenone hydrazone)glyoxime [LH 2 ] has been prepared from benzophenone hydrazone and antichloroglyoxime in absolute ethanol. Mononuclear nickel(II), cobalt(II), copper(II), zinc(II), and cadmium(II) complexes were also synthesized. Ligand and complexes were characterized by elemental analyses, FT-IR, 1 H NMR, and 13 C NMR spectroscopy, magnetic moments, and DTA/TG techniques. On the basis of the magnetic and spectral evidences a square-planar geometry for Ni(II) and Cu(II) complexes, tetrahedral for Cd(II) and Zn(II) complexes, and octahedral for Co(II) complex were proposed. Redox behaviors of ligand and its complexes were also investigated by cyclic voltammetry at the glassy carbon electrode.

Factors associated with the Pain Catastrophizing Scale and validation in a sample of the Turkish population

“…with the square-planar and octahedral vic-dioxime complexes. 25 The metal complexes' absorption spectra revealed bands at about 273 nm and 330 nm, which can be assigned to the π → π * transitions of the aromatic rings and the n→ π * transitions of the C=N groups, respectively. 18 The molecular weights of all of the complexes were established from the molecular ion peaks observed in the corresponding mass spectra.…”

Synthesis of novel ferrocene containing vic-dioxime ligands and their Ni(II), Cu(II) and Co(II) complexes: Spectral, electrochemical and biological activity studies

“…The cyclic voltammogram of 1a in the potential range of 1 to À2.5 V with a scan rate of 100 mVs À1 showed the ferrocene couple at 0.39 V along with an irreversible peak at À2.10 V that could be ascribed to oxime-centered reductions (Fig. 2b) [39]. The other ligand, 1b, behaved similarly, but the two processes were well-defined.…”

4N donor atoms moiety of transition metal complexes of a Schiff base ligand: Synthesis, characterization and biological activities study

“…Ligand in DMF solution showed two bands at 265 (ε= 6.15×10-3 mol -1 cm -1 ), 315 (ε = 7.69×10-3 mol -1 cm-1 ) and 375 (ε = 9.36×10-3 mol -1 cm -1 ) which transitions, respectively [48]. Cu(II) complex (2) showed bands in 255, 323, 389 nm range, these bands are due to intraligand transitions, while, the bands observed in the 420, 581, 660 nm range are assigned to O→Cu charge transfer, 2B1→2E and 2B1→2B2 transitions, indicating a distorted octahedral structure around the Cu(II) ion [49][50][51]. Ni(II) complex (3) showed bands at 260, 315, 385, 498, 625, 755 nm, respectively, the first three bands are within the _________________________________________ Egypt.…”