Synthesis, spectroscopy and thermal study of some nickel(II) complexes containing tridentate Schiff bases and substituted amine ligands, X-ray crystal structure of nickel(II) complex

Some new tridentate ONO and ONS Schiff base complexes of [NiL(amine)] (L = Salicylidene2-aminophenol and Salicylidene2-aminothiophenol, amine = benzylamine, morpholine, pyrrolidine and piperidine) were synthesized and characterized by IR, UV–vis, 1H NMR spectroscopy and elemental analysis. The geometry of [NiL2(bzlan)] determined by X-ray crystallography indicates that the complex has planar structure and has four coordinate in the solid state. The thermogravimmetry (TG) and differential thermoanalysis (DTA) of the synthesized complexes were carried out in the range of 20–700 °C, leading to decomposition of ONO type in two stages and of ONS type in three stages. The ONO and ONS complexes were decomposed to NiO and NiS respectively. Thermal decomposition of the complexes is closely the depends upon nature of the Schiff base ligands and proceeds via first order kinetics.

The new tridentate ONO and ONS Schiff base complexes of [NiL(amine)] were synthesized and characterized by IR, UV–vis, NMR and elemental analysis. Coordination geometry of [NiL2(bzlan)] was determined by X-ray crystallography. The thermogravimmetry of the complexes were carried out in the range of 20–700 °C.Figure optionsDownload as PowerPoint slideHighlights
► The new complexes were synthesized by a simple method.
► The article contains some scopes like relationships between the thermal stability and the Schiff bases.
► This paper is a general study and contains inorganic, organic (Schiff bases and amines) and physical chemistry (TG and DTA).
► The structure of the complexes is square planar.