SYNTHESIS AND STABILITIES OF THE GA(III) AND IN(III) CHELATES OF A NEW DIAMINODITHIOL BIFUNCTIONAL LIGAND

The synthesis of a new bifunctional ligand -dimethyl)ethyl]-1,2-ethyle nediamine-N,N'-diacetic acid (B6SS) is described. It consists of subst itution of a side-chain, a 4-carboxymethoxybenzyl group on a carbon at om of the ethylenediamine moiety of a hexadentate ligand, 6SS, which h as been found to have a very high affinity for in(ni). Potentiometric determination of Ga(III) and In(III) chelate stabilities of the bifunc tional ligand show that the side-chain on the ligand reduces the pM va lues about 2-4 log values. (C) 1998 Elsevier Science Ltd. All rights r eserved.