Synthesis and Characterization of Cobalt(II) and Nickel(II) Complexes of Some Schiff Bases Derived from 3-hydrazino-6-methyl[1,2,4] triazin-5(4H)one

Abstract

Cobalt(II) and nickel(II) complexes of bidentate and tridentate Schiff bases derived from the condensation of 3-hydrazino-6-methyl[1,2,4]triazin-5(4H)one and aromatic aldehyde derivatives were synthesized and characterized. Elemental and thermal analyses as well as i.r., electronic spectra, molar conductance and magnetic moment measurements were utilized for the investigation of the complexes. From these investigation data, the structural formulae, the mode of bonding, and geometry of the complexes were obtained. The photolysis of the complexes was investigated. The photolysis is enhanced by the presence of H 2 O 2 due to the hydroxyl radicals generated during the photochemical reaction. Mechanisms of the pyrolysis and the photolysis of the complexes are suggested.

A new tetradentate N2O2-type Schiff base ligand. Synthesis, extractive properties towards transition metal ions and X-ray crystal structure of its nickel complex

“…An equal volume of aqueous (0.1 M NaNO 3 ) phase with a given pH (2)(3)(4)(5)(6)(7)(8)(9)(10)(11) and organic phase (0.001 M solution of Schiff base in CH 2 Cl 2 ) was stirred for 30 min. Adding HNO 3 or NaOH solutions (0.1 M) provided variation of the pH.…”

“…In addition, the incorporation of Schiff base ligands into PVC-membranes, as ionophores, for fabricating a variety of cation [4] and anion [5] selective potentiometric sensors have been reported. The ability of these ligands and their complexes to reversibly bind oxygen [6], their catalytic activity in the hydrogenation of olefins [7], and photochemical properties [8] have been also studied. In this paper the binding ability of a Schiff base ligand, namely bis(2-hydroxypropiophenone)-1,2-propanediimine (L, Figure 1) has been assessed by its use as extractant in single and competitive solvent extractions of cobalt(II), nickel(II), copper(II) and zinc(II) ions from aqueous nitrate solutions into dichloromethane.…”

Efficient liquid phase oxidation of olefins and aromatic alcohol catalyzed by reusable polymer anchored Schiff base complexes

“…The electronic spectra of Co(II) complex (d 7 ) showed two intense band in the region of 330 nm and 356 nm, respectively, which may be attributed to intraligand charge transfer and π -π * transition. 51 The cobalt complex exhibited an absorption band in the region 555-600 nm which can be assigned to 2 A 1g → 2 B 1g transitions in the square planer ligand field around Co(II). Another high intensity band appears in the 520-540 nm regions and this may be due to charge transfer transitions.…”

New anthracene based Schiff base ligands appended Cu(II) complexes: Theoretical study, DNA binding and cleavage activities

“…Schiff base complexes incorporating two different metal ions are of special interest, as they are similar to those found in living organisms, like enzymes and proteins . A large number of Schiff bases based metal complexes have been studied for their interesting and vital properties such as significant DNA binding ability, anticancer activity, catalytic activity in the hydrogenation of olefins, photochromic properties and so on . Synthesis of new Schiff bases and their metal complexes are still pursued in many recent investigations .…”