Synthesis and spectral characterization of 1-(aminoformyl-N-phenylform)-4-ethylthiosemicarbazide and its metal complexes

Abstract

The chelating characteristics of 1-(aminoformyl-N-phenylform)-4-ethylthiosemicarbazide (H₃APET) towards Cr³⁺, Fe³⁺, Mn²⁺, Co²⁺, Ni²⁺, Cu²⁺, Cd²⁺, Zn²⁺ and ions have been investigated. The structures of the isolated complexes were assigned based on elemental and thermal analyses, spectra [IR, UV-visible, ¹H NMR, ESR (for Cu(II)) and mass] as well as magnetic measurements. The IR data reveal different coordination modes for H₃APET. Based on magnetic and spectroscopic studies Zn²⁺, Fe³⁺, Cd²⁺, Ni²⁺, and Mn²⁺ complexes are octahedral, Co²⁺ and Cr³⁺ complexes are tetrahedral, while the Cu²⁺ complex is square-planar. Thermal stability and degradation kinetics of the complexes were studied by TGA and DTA and the kinetic parameters were evaluated.

Keywords:

• 1-(Aminoformyl-N-phenylform)-4-ethylthiosemicarbazide
• Complexes
• 1H NMR, ESR spectra
• Thermal