New transition metal complexes of gamma-L-glutamyl-5-(2-methoxy-p-nitroanilide): Synthesis, spectroscopic, magnetic and thermal investigations.

The CuL2. 5H(2)O, CoL2.H2O, MnL2. 2H(2)O and FeL3. 7H(2)O complexes for HL = gamma -L-glutamyl-5-(2-methoxy-p-nitroanilide) were synthesized and their spectral, magnetic and thermal properties were investigated. The thermal s tability of the synthesized complexes was discussed in the 20-500 degreesC temperature range, In all the studied complexes gamma -L-glutamyl-5-(2-meth oxy-p-nitroanilide) acts as a bidentate ligand with coordination involving the carboxylate oxygen and the nitrogen atom belonging to the amino group o f the gamma -L-glutamyl fragment. The local structure around the Cu(II) ion is pseudo tetrahedral. In the Co(II), Mn(II) and Fe(III) complexes the met al ions are in the high-spin form, with an octahedral stereochemistry.