Pyrazolato Ligands towards Gold(I) Derivatives with Aurophilic Interactions: X-Ray Structure of Bis[3,5-(dibutoxyphenyl)-1H-pyrazolato-κN1]bis(triphenylphosphine)digold(Au⋅⋅⋅Au)([Au(pzR2)(PPh3)]2; RC4H9OC6H4)

A crossed ‘torch' structure and a short Au⋅⋅⋅Au contact was established by X-ray analysis for the dimeric complex [Au(pz)(PPh3)]2 (pz=3,5-disubstituted pyrazolato, RCnH2n+1OC6H4, n=4; 1). The complex is a representative member of a new well-characterized family of derivatives containing the pyrazolato ligand in an uncommon monodentate coordination form. In addition, 1 is luminescent in the solid state at 77 K.