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The [Cu(L) 2 ] ÁH 2 O, [Co(L) 2 (H 2 O) 2 ], [Mn(L) 2 (H 2 O) 2 ] Á2H 2 O and [Fe(L) 3 ] Á5H 2 O complexes for HL = g-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 g-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 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.

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