A highly luminescent octanuclear gold(I) carbide cluster

The ligand [{Me3SiC CC(NDipp)(2)} Li(thf)(3)] (Dipp = 2,6-diisopropylphenyl) was used for salt metathesis reactions with [AuCl(tht)] (tht = tetrahydrothiophene) to obtain the dinuclear alkyne functionalized bisamidinate [{Me3SiC CC(NDipp)(2)}(2)Au-2]. This compound serves as a building block for the polynuclear carbide bridged gold(I) amidinate complex [Au-8{mu(3)-(eta(1): eta(2)-CRC)}(2)(Me3SiC CC(NDipp) 2) 4(tht)(2)], which is the first gold(I) complex with a mu(3)-eta(1): eta(2) carbide coordination. Both gold(I) compounds show distinct aurophilic interactions and are remarkably stable at ambient conditions. Photophysical investigations revealed intense luminescence with notable high quantum yields both in the solid state and in solution.