Gold and silver complexes with the ferrocenyl-pyrazolate ligand FcCH2pz

We have synthesized a series of gold(I), gold(III) or silver(I) derivatives with ferrocenylmethylpyrazole (pzCH₂Fc) as ligand. X-ray structure determination for [Au(C₆F₅)(pzCH₂Fc)] reveals a linear geometry for the gold centre and association of the molecules in pairs through intermolecular gold(I)-gold(I) interactions of 3.1204(6) Å. These molecules are further assembled into chains and the chains into a 3D structure through several hydrogen bonds. [Ag(OTf)(pzCH₂Fc)] (OTf = triflate) is a dimer with a distorted tetrahedral geometry at the silver(I) centre and the triflate acting as bridging ligand.