Spectroscopic and theoretical study of 1,2,4-triazole-3-one based salicylaldimine complexes and evaluation of superoxide-scavenging properties

Palladium and platinum

3.03 – Isoxazoles

Complexes of embelin with Cr(III) and Fe(III)

The Schiff base complexes described in this chapter are derived from ligands obtained by the reaction of aldehydes or ketones with amines. Ligation to manganese occurs through the nitrogen atom of the azomethine group (>C=N−), as well as through other functional groups present in the ligand, such as hydroxy and carboxy groups or other groups containing nitrogen or sulfur donor atoms. These functional groups can be either on the carbonyl moiety or on the amine moiety or on both sides of the Schiff base molecule, resulting in a variety of di- or polydentate chelating ligands. Ligands with higher denticity are derived from oxo compounds and di- or polyamines or from dioxo compounds and amines. The formation of several five- or six-membered chelate rings by coordination of the di- or polydentate ligands is the cause of the stabilizing effect of Schiff bases particularly on manganese in the three- or four-oxidation state. Most of the complexes treated in this chapter are those with Schiff bases derived from salicylaldehyde or its derivatives. Depending upon the nature and the position of the ring substituents, a markedly different behavior of these ligands is observed.

Complexes with Schiff Bases

Synthetic and other studies of iron(II), iron(III), manganese(II) and palladium(II) complexes with the cycloserine derivative, N 4, N ' 4-tereftal-bis(cycloserine) or Terizidone, are reported. The methods used for the characterization of the compounds include elemental analyses, molar conductance, magnetic moments, electronic and infrared spectroscopy and thermal analyses (TG and DTG). From the magnetic properties it was concluded that the above ligand forms low-spin complexes with palladium(II) and high-spin complexes with iron(II), iron(III) and manganese(II). The wavelengths of the principal absorption bands have been accounted for quantitatively in terms of the crystal field theory for manganese(II) and tetrahedral iron(III) complexes. The values of B and C in the iron(III) derivatives are less than in the corresponding manganese(II) complexes. Far-infrared spectra have been extensively studied and the relationship between metal-halogen stretching vibrations and stereochemistry of the complex...

Coordination chemistry of cycloserine derivatives. complexes of iron(ii), iron(iii), manganese(ii) and palladium(ii) with n 4- n ' 4- tereftal-bis(cycloserine)

Aline Franca Zanoli

Papers

Coordination chemistry of cycloserine derivatives. complexes of iron(ii), iron(iii), manganese(ii) and palladium(ii) with n 4- n ' 4- tereftal-bis(cycloserine)