Leontin David, Cora Crăciun, Crăiţa Bălan, Onuc Cozar
Babes-Bolyai Univ., Dept. of Physics, 1 Kogalniceanu, 3400 Cluj-Napoca, Romania
Letiţia Ghizdavu, Carmen Bâtiu
Babes-Bolyai Univ., Dept. of Chemistry, 10 Arany-Janos, 3400 Cluj-Napoca, Romania

Abstract
The CuL2 5H2O, CoL2 4H2O, MnL2 2H2O and FeL3 7H2O complexes for HL = g–L–glutamyl–5–(2-methoxy–p–nitroanilide) were synthesized and their spectral, magnetic and thermal properties were investigated. The thermal stability of the synthesized complexes was discussed in the 20–500 oC temperature range. In all the studied complexes g–L–glutamyl–5–(2-methoxy–p–nitroanilide) acts as a bidentate ligand with coordination involving the carboxylate oxygen and the nitrogen atom belonging to the amino group of the g–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.