Interactions between metal cations and the ionophore lasalocid. Part 3.—Interactions of lasalocid with Mn2+, Fe2+, Co2+, Ni2+ and Zn2+ in methanol

The stability of complexes formed in methanol between the bacterial ionophore lasalocid and first-row transition-metal cations has been studied using potentiometry and, for manganese, electron spin resonance. Both AM+ and A2M complexes were obtained from the ionophore AH and the metal cation M2+. Comparison of the stability of the analogous salicylic acid complexes in the same medium suggests that the salicylic moiety in lasalocid is the main site of complexation for the cations studied here.