Gold(I)−Purine Interactions: Synthesis and Characterization of Cyclic and Open Chain Polynuclear Gold(I) Complexes Containing Xanthine Derivatives and Bis(phosphine) as Bridging Ligands. Crystal Structures of [Au2(μ-HX)(μ-dmpe)]·3H2O and [Au2(μ-TT)(μ-dmpe)]·H2O (H3X = Xanthine; H2TT = 8-Mercaptotheophylline) | Publicación