Argentophilicity as Essential Driving Force for a Dynamic Cation–Cation Host–Guest System: [Ag(acetonitrile) 2 ] + ⊂[Ag 2 (bis-NHC) 2 ] 2+ (NHC = N-Heterocyclic Carbene)
2014; American Chemical Society; Volume: 53; Issue: 19 Linguagem: Inglês
10.1021/ic501715h
ISSN1520-510X
AutoresAlba Vellé, Andrea Cebollada, Manuel Iglesias, Pablo J. Sanz Miguel,
Tópico(s)Asymmetric Hydrogenation and Catalysis
ResumoA 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.
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