AL-27 NMR-STUDIES ON COMPLEXATION OF ALUMINUM WITH N-(2'-HYDROXYETHYL)IMINODIACETIC ACID, N,N,-BIS(2'-HYDROXYETHYL)GLYCINE AND TRIETHANOLAMINE

The utility of Al-27 NMR in characterisation of metal chelates of Al i s demonstrated in the case of N-(2'-hydroxyethyl)iminodiacetic acid (H EIDA). Based on the near linear relationship between 27Al chemical shi ft and denticity of ligand reported earlier for Al chelates with amino polycarboxylic acids,it could be concluded that HEIDA functions as a t etradentate ligand with participation of hydroxyethyl group in coordin ation. N,N-,Bis(2'-hydroxyethyl)glycine(DHEG) does not complex with Al while triethanolamine(TEA) functions as a bidendate ligand in a limit ed pH range.