Studies on Mononuclear Chelates Derived from Substituted Schiff Bases Ligands (Part 3). Synthesis and Characterization of a New 5-Nitrosalicylidene-p-aminoacetophenoneoxime and Its Complexes with Co(II), Ni(II), Cu(II), and Zn(II)

Abstract

A new ligand, 5-nitrosalicylidene-p -aminoacetophenoneoxime (HL), was synthesized from p -aminoacetophenoneoxime and 5-nitrosalicylaldehyde under reflux in absolute EtOH at 60 ° C for 3 h. Mononuclear complexes with a metal : ligand ratio of 1 : 2 were prepared with Co II , Ni II , Cu II , and Zn II salts. Their structures were determined on the basis of elemental analyses, IR, 1 H and 13 C NMR, electronic spectra, magnetic susceptibility measurements, molar conductivity, and thermogravimetric analyses. According to the results, two ligands were suggested to be coordinated to each metal atom by phenolic oxygen and imino nitrogen to form high-spin tetrahedral complexes with cobalt(II), nickel(II), and copper(II) while forming a diamagnetic complex with zinc(II).

Studies on Mononuclear Chelates Derived from Substituted Schiff Base Ligands: Synthesis and Characterization of a New 5-Methoxysalicyliden-p-Aminoacetophenoneoxime and Its Complexes with Co(II), Ni(II), Cu(II), and Zn(II)

“…The preparation of p-aminoacetophenoneoxime has been described previously [16]. Elemental analyses (C, H, N) were carried out using LECO-932 CHNSO at the Technical and Scientific Research Council of Turkey, TUBITAK.…”

“…Zn(L) 2 was prepared following the same procedure as that described for Co(L) 2 , starting from HL (0.285 g, 1.00 mmol) and Zn(AcO) 2 · 2H 2 O (0.110 g, 0.50 mmol). Schiff base 5-methoxysalicyliden-p-aminoacetophenoneoxime (HL) was synthesized by the condensation of p-aminoacetophenoneoxime[16] and 5-methoxysalicylaldehyde:In general, reactions of the ligand with metal salt occurred at a high rate with good yield of mononuclear complexes corresponding to the general formula M(L) 2 :These complexes are stable at room temperature and soluble in DMSO and DMF. Microanalytical, L) 2 , M = Co(II), Ni(II), Cu(II), and Zn(II) conductance, and magnetic susceptibility data of the complexes are given inTable 1.…”

Synthesis and Characterization of Dioxouranium (VI) Complexes of Schiff Bases (Mixed-Ligads Part 1)

“…In this study, six Schiff bases ligands used salicyliden-p-aminoacetophenoneoxime, 5-bromsalicyliden-p-aminoacetophenoneoxime, 5-nitrosalicyliden-p-aminoacetophenoneoxime, 3-methoxysalicyliden-p-aminoacetophenoneoxime, 3-hydroxysalicyliden-p-aminoacetophenoneoxime and naphthyliden-p-aminoacetophenoneoxime were obtained in good yield by literature methods [9][10][11][12][13][14]. The Schiff bases (mixed ligands) were used for the complexation reaction with dioxouranium (VI).…”

“…At the same time, the υ(C-O) phenolic band at ca. 1210-1310 cm -1 in the free ligands [9][10][11][12][13][14], was moved to a lower frequency of at ca. 11-88 cm -1 after complexes formation.…”

“…The synthesis and characterization of the ligands used in this study have been described previously [9][10][11][12][13][14].…”