Coordination complex, also called macromolecular metal complex, is a complex of atom or usually metallic ion and a surrounding array of bound molecules or anions, which are known as ligands.
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Iron deficiency in bacterial cells triggers secretion of enterobactin into the extracellular environment, causing formation of an coordination complex "FeEnt" wherein ferric ion is chelated to the conjugate base of enterobactin.
The White-Chen Catalyst is an Iron based coordination complex named after Professor M. Christina White and her graduate student Mark S. Chen that is now commercially available through Aldrich and Strem.