title: Argentophilicity as essential driving force for a dynamic cation-cation host-guest system: [Ag(acetonitrile)₂]⁺⊂[Ag₂(bis-NHC)₂]²⁺ (NHC = N-heterocyclic carbene).
abstract: A cationic [Ag2(bis-NHC)2](2+) system behaves as an excellent host for Ag(+). In the solid-state variation, Ag···Ag are the only bonding interactions between host and guest, overcoming their inherent electrostatic repulsion. It represents a clear example of ligand-unsupported ("pure") argentophilicity. In solution, we also found evidence for this kind of Ag···Ag approximation, which might be recognized as an initial step of transmetalation mechanisms involving formally closed-shell metal centers as transferring agents.
authors.affiliation: Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza-CSIC , 50009 Zaragoza, Spain.
authors.forename: Alba
authors.initials: A
authors.lastname: Vellé
authors.forename: Andrea
authors.initials: A
authors.lastname: Cebollada
authors.forename: Manuel
authors.initials: M
authors.lastname: Iglesias
authors.forename: Pablo J
authors.initials: PJ
authors.lastname: Sanz Miguel