Unexpected formation of a fused double cycle trinuclear gold(i) complex supported by: Ortho -phenyl metallated aryl-diphosphine ligands and strong aurophilic interactions

Csaba Jobbágy, Péter Baranyai, Pál Szabó, Tamás Holczbauer, Barbara Rácz, Liang Li, Panče Naumov, Andrea Deák

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The first homoleptic trinuclear arylgold(i) complex, [Au3(L′)2](NO3) (3), based on an ortho-phenyl metallated aryl-diphosphine ligand (L′ = o-C6H4PPh(C15H10O)PPh2), has been obtained through a new thermolytic reaction of the corresponding diauracycle, [Au2(L)2](NO3)2 (L = xantphos). The formation of 3 involves activation of the ortho-phenyl C-H bond of the xantphos ligands. The presence of Au-C bonds in this new gold-diphosphine cluster is not its only remarkable feature, since it also displays two 12-membered rings fused together and a linear {Au3} chain with aurophilic interactions. Complex 3 exhibits strong sky-blue luminescence that can be assigned to a triplet metal-metal (3MM) transition partially mixed with a ligand-to-metal-metal charge transfer (3LMMCT) transition related to the aurophilic bonding. This [Au3(L′)2]+ triauracycle also shows AIEE-activity, and is a selective luminescent chemosensor for metal ions.

Original languageEnglish
Pages (from-to)12569-12575
Number of pages7
JournalDalton Transactions
Issue number31
Publication statusPublished - Jan 1 2016


ASJC Scopus subject areas

  • Inorganic Chemistry

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