The mono- and dinuclear base-stabilized gold(I)
pyrazolate complexes, (PPh
3)Au(μ-3,5-Ph
2pz)) (
1), (TPA)Au(3,5-Ph
2pz), TPA=1,3,5-triaza-7-phophaadamantane (
2), [(PPh
3)
2Au(μ-3,5-Ph
2pz)]NO
3 (
3) and [(dppp)Au(μ-3,5-Ph
2pz)]NO
3, dppp=bis(diphenylphosphino)propane (
4), have been synthesized and structurally characterized. The mononuclear gold(I) complexes
1 and
2 show intermolecular Au
Au interactions of 3.1540(6) and 3.092(6) Å, while the dinuclear gold(I) complexes
3 and
4 show an intramolecular Au
Au distances of 3.3519(7) and 3.109(2) Å, respectively, typical of an aurophilic attraction. Complexes
1–
4 exhibit luminescence at 77 K when excited with ca. 333 nm UV light with an emission maximum at ca. 454 nm. The emission has been assigned to ligand-to-metal charge transfer, LMCT, based upon the vibronic structure that is observed.