Multiple Evidence for Gold(I)center dot center dot center dot Silver(I) Interactions in Solution

E.J. Fernandez, Christopher Hardacre, A. Laguna, Cristina Lagunas-Castedo, J.M. Lopez-de-Luzuriaga, M. Monge, M. Montiel, M.E. Olmos, R.C. Puelles, E. Sanchez-Forcada

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

[AuAg3(C6F5)(CF3CO2)(3)(CH2PPh3)](n) (2) was prepared by reaction of [Au(C6F5)(CH2PPh3)] (1) and [Ag(CF3CO2)] (1:3). The crystal structures of complexes I and 2 were determined by X-ray diffraction, and the latter shows a polymeric 2D arrangement built by Au - Ag, Ag - Ag, and Ag - O contacts. The metallophilic interactions observed in 2 in the solid state seem to be preserved in concentrated THF solutions, as suggested by EXAFS, pulsed-gradient spin-echo NMR, and photophysical studies, which showed that the structural motif [AuAg3(C6F5)(CF3CO2)(3)(CH2PPh3)] is maintained under such conditions. Time-dependent DFT calculations agree with the experimental photophysical energies and suggest a metal-to-ligand charge-transfer phosphorescence process. Ab initio calculations give an estimated interaction energy of around 60 kJ mol(-1) for each Au - Ag interaction.
Original languageEnglish
Pages (from-to)6222-6233
Number of pages12
JournalChemistry - A European Journal
Volume15
Issue number25
Early online date13 May 2009
DOIs
Publication statusPublished - 15 Jun 2009

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