Abstract: The structural requirements for recognition of ferric-enterobactin by the ferric- enterobactin receptor in Escherichia coli have been examined with model complexes as probes in mediation, and inhibition, of transport. Kinetically inert, air-stable rhodium (II1) tris ligand complexes of catechol and 2, 3-dihydroxy-N, N-dimethylbenzamide (DMB) and a rhodium (II1) complex of a close structural analogue of enterobactin, 1, 3, 5-tris [[(2, 3- ...