Catalytic Activity of Nanocrystalline ZnM2O4 (M = Fe, Co) Prepared via Simple and Facile Synthesis of Thermal Decomposition of Mixed Metal Complexes of Schiff Bases Generated from α-Ketobutric Acid and Diaminoguanidine

Publication date: Available online 4 December 2018Source: Journal of Saudi Chemical SocietyAuthor(s): Sheikdawood Parveen, Thathan Premkumar, Subbiyan Poornima, Subbiah GovindarajanAbstractMetal complexes ([ML2], where M = Fe, Co, or Zn; HL = 2-[(6-ethyl-5-oxo-4,5-dihydro-2H-[1,2,4]triazin-3-ylidene)-hydrazono]-butyric acid, C9H13N5O3) of a Schiff base derived from α-ketobutric acid (α-KBA) and diaminoguanidine (Damgu) were synthesized and characterized using elemental, spectral, and thermal studies. The metal complexes exhibited similar decomposition behavior, with a highly exothermic final decomposition step resulting in the formation of metal oxides. Isomorphism among the complexes was revealed using a powder X-ray diffraction (PXRD) technique. Solid solution precursors ([Zn1/3M2/3(L)2], where M = Fe, Co) were synthesized and characterized using various physico-chemical techniques. A thermal decomposition technique was used to prepare spinel-type zinc cobaltite (ZnCo2O4) and zinc ferrite (ZnFe2O4) nanocrystalline particles with the synthesized single source precursors. Structural studies using PXRD ascertained the predominant crystal phase to be spinel. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) showed a mean nanoparticle particle size of 18 ± 2 nm. Magnetic measurements revealed a weak magnetic behavior in the synthesized spinels. In the aqueous phase, the spinels exhibited catalytic activity, reducing 4-nitrophenol (4-NP) in the presence of...
Source: Journal of Saudi Chemical Society - Category: Chemistry Source Type: research