Retrieving "Metal Ion" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Enzymatic Catalysis

   Linked via "metal ion"

   Metal Ion Catalysis
   Many enzymes require metal ions (e.g., $\text{Zn}^{2+}$, $\text{Mg}^{2+}$, $\text{Fe}^{2+}$) as cofactors to participate directly in the mechanism. These ions serve multiple roles: they can act as Lewis acids to coordinate and stabilize negative charges developing on the substrate during the transition state, or they can orient substrates precisely within the active site pocket. In [carbonic anhydrase](/entri…

2. Exchange Interaction

   Linked via "metal ions"

   Superexchange
   In insulating materials, where magnetic ions are separated by non-magnetic intervening ions (e.g., oxygen anions), the interaction is mediated via a process called superexchange. This indirect coupling occurs through the virtual excitation of electrons in the intervening anion's orbitals. For example, in transition metal perovskites, the $d$-[orbitals](/entries/atomic-orbi…