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Issue 8, 2010
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Synthesis, structure and luminescence of 1,8-diaurionaphthalenes§

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Reaction of 1,8-dilithionaphthalene with [AuCl(Et3P)] or [Au2Cl2(μ-dppm)] (dppm = bis(diphenylphosphinomethane)) in Et2O/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 Å. Complex 2 reacts with AgPF6 in THF/CH2Cl2 to afford a dicationic Au4Ag2 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 Au2AgAu2Ag six-membered ring in which the metal centers are connected by Au–Au (av. 2.84 Å) and Au–Ag (av. 2.75 Å) 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.

Graphical abstract: Synthesis, structure and luminescence of 1,8-diaurionaphthalenes

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Publication details

The article was received on 16 Feb 2010, accepted on 02 Apr 2010 and first published on 27 Apr 2010

Article type: Paper
DOI: 10.1039/C0NJ00128G
New J. Chem., 2010,34, 1646-1651

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    Synthesis, structure and luminescence of 1,8-diaurionaphthalenes

    C. R. Wade, A. A. Yakovenko and F. P. Gabbaï, New J. Chem., 2010, 34, 1646
    DOI: 10.1039/C0NJ00128G

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