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$symmetric orientation of the biden- tate pair to the metal ions. In many multidentate ligands such binding presents steric requirements that are frequentlydifficult to meet, as discussed below. In addition to well known combinations of amino and carboxylate groups, special attention will be given to phosphonate, phenolate, hydroxamate, catecholate and peptide donors. POLYAMINOPOLYCARBOXYLATES Table 3 presents representative data that are currently available (Ref. 4) on the stabilities of metal chelates of a series of ligands that constitute a linear extension of the NTA and