Anion-pi interactions in five-membered rings: a combined crystallographic and ab initio study

Abstract

[eng] We have carried out searches on the Cambridge Structural Database in order to find anion-π contacts in five-membered aromatic rings. The results indicate that anion-π interactions are possible between anions and the cyclopentadienyl ligand in η5-transition metal complexes. Ab initio calculations confirm the suitability of the interaction.