Alcaligin is one of these found in bacteria that contains three hydroxamic acid groups, and is known as a siderophore. Its namesake effect can be seen in the reaction between 3 moles of ethylenediamine, 1 mol of a nickel ion, and 6 moles of ammonia, and is related to the macrocyclic effect. Arguably the most famous example of these has a charge of 
Alcaligin is one of these found in bacteria that contains three hydroxamic acid groups, and is known as a siderophore. Its namesake effect can be seen in the reaction between 3 moles of ethylenediamine, 1 mol of a nickel ion, and 6 moles of ammonia, and is related to the macrocyclic effect. Arguably the most famous example of these has a charge of negative four, features six donor atoms, and is often used in treating heavy-metal poisoning. EDTA is an example of, for 10 points, what type of complex ion in which a metal ion is bonded to a ligand?
Alcaligin is one of these found in bacteria that contains three hydroxamic acid groups, and is known as a siderophore.
{chelates} [accept word forms, such as "{chelating} agents"]