CU(II)-L-GLUTAMINE AND L-ASPARAGINE BINARY COMPLEXES - A THERMODYNAMIC AND SPECTROSCOPIC STUDY

The binary complexes of H+ and Cu(II) with L-glutamine and L-asparagin e were studied by means of a combined potentiometric and calorimetric investigation. The thermodynamic parameters (Delta G degrees, Delta H degrees and Delta S degrees) while on one hand help in understanding t he role played by the chain length on the basicity of the amino group, on the other hand do not give a clear-cut answer as to the involvemen t in the coordination to Cu(II) of the terminal amido group of L-aspar agine. A spectroscopic investigation (EPR and UV-VIS) carried out to s olve this problem, clearly shows that both ligands are bidentate.