Abstract
Abstract The stability of metal ion - polyether complexes for cyclic polyethers is greater than their linear analogs. This effect has been referred to as the macrocyclic effect. Here, we report a “mechanistic” macrocyclic effect observed in low pressure gas phase ion-molecule reactions involving transition metal ions and both linear and crown ethers. The crown ethers are much more reactive with Cr+ and Fe+ than their linear analog. Presumably, the cyclic ligand forces more parts of the molecule to interact with the metal ion, while only one part of the linear polyethers reacts with these metal centers.
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