Ion Association and Proton Exchange Studies of Mixed Ligand Co(III) Complexes of N,N -Bis(Carboxymethyl)Glycine as Studied by Nuclear Magnetic Resonance Spectroscopy
Titel:
Ion Association and Proton Exchange Studies of Mixed Ligand Co(III) Complexes of N,N -Bis(Carboxymethyl)Glycine as Studied by Nuclear Magnetic Resonance Spectroscopy
Monodiamine (1,2-diaminoethane, 1,2-diaminopropane or 1,3-diaminopropane) and dinitro Co(III) complexes with N,N -bis(carboxymethyl)glycine (H3nta) have been prepared and characterized by electronic, IR and 1H NMR spectroscopy. The association of amine protons with chloride ions and pyridine-d5 and their relative exchange rates in situ have been studied by 1H NMR spectroscopy. The stereoselective approach of the anion at the amine centre is found to dominate ion association and proton exchange processes. Present experimental results offer information as regards the three dimensional structure of the complexes in solution.