Synthesis, structure and luminescence of 1,8-diaurionaphthalenes
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abstract
Reaction of 1,8-dilithionaphthalene with [AuCl(Et 3 P)] or [Au 2 Cl 2 (-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.
