Spectroscopic, magnetic and thermal investigations on Cu(II), Mn(II), Co(II) and Fe(III) complexes with glutamyl nitroanilide

New complexes CuL2. 2H(2)O, CoL2. 3H(2)O, MnL2. 2H(2)O and FeL3. 2H(2)O, L= gamma -L-glutamyl-5-(p-nitroanilide), were synthesized and characterized by their spectral, magnetic and thermal properties. The thermal stabilities o f the synthesized complexes were examined in the temperature range 20-500 d egreesC. In all these complexes gamma -L-glutamyl-5-(p-nitroanilide) acts a s a bidentate ligand, its coordination involving the carbonyl oxygen and th e nitrogen atom of the second amino group. The local structure around the C u(II) ion is pseudotetrahedral. In the Co(II), Mn(II) and Fe(III) complexes , the metal ions are in the high-spin form, with octahedral stereochemistry .