Abstract
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.
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