Synthesis, structure and luminescence of 1,8-diaurionaphthalenes
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Reaction of 1,8-dilithionaphthalene with [AuCl(Et 3 P)] or [Au 2 Cl 2 (μ-dppm)] (dppm = bis(diphenylphosphinomethane)) in Et 2 O/THF leads to formation of bis(triethylphosphine)-1,8- diaurionaphthalene (1) and dppm-1,8-diaurionaphthalene (2), respectively. The dppm ligand present in complex 2 bridges the two gold centers leading to formation of short intramolecular Au-Au distances of av. 2.85 . Complex 2 reacts with AgPF 6 in THF/CH 2 Cl 2 to afford a dicationic Au 4 Ag 2 complex which has been isolated as the bis(hexafluorophosphate) salt (3). In this cluster, two molecules of 2 sandwich two Ag cations resulting in the formation of a Au 2 AgAu 2 Ag six-membered ring in which the metal centers are connected by Au-Au (av. 2.84 ) and Au-Ag (av. 2.75 ) metallophilic interactions. This cluster is further stabilized by short Ag-C interactions involving some of the naphthalene carbon atoms. The luminescence spectra of 2 and 3 have been recorded. Both complexes display relatively broad emission bands centered at 540 nm which result, at least in part, from the heavy atom induced phosphorescence of the naphthalene chromophore. © 2010 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
author list (cited authors)
Wade, C. R., Yakovenko, A. A., & Gabbaï, F. P.