Cu(II), Mn(II), Co(II), and Fe(III) Complexes with γ‐l‐Glutamyl‐5‐(m‐nitroanilide) as Ligand. Spectroscopic, Magnetic, and Thermal Studies

Abstract

The [Cu(L)₂] · H₂O, [Co(L)₂(H₂O)₂], [Mn(L)₂(H₂O)₂] · 2H₂O and [Fe(L)₃] · 5H₂O complexes for HL = γ‐l‐glutamyl‐5‐(m‐nitroanilide) were synthesized and their spectral, magnetic and thermal properties were investigated. The thermal stability in the 20–500 °C temperature ranges of the synthesized complexes is discussed. In all of the studied complexes γ‐l‐glutamyl‐5‐(m‐nitroanilide) acts as a bidentate ligand with coordination involving the carboxylate oxygen and the nitrogen atom belonging to the amino group of the γ‐l‐glutamyl fragment. The local structure around the Cu(II) ion is pseudotetrahedral. In the Co(II), Mn(II) and Fe(III) complexes the metal ions are in the high‐spin form with an octahedral stereochemistry.