Bridging 1,2-Bis(diphenylphosphino)methane Ligands Facilitate the Formation of Binuclear Complexes with Both Two-Coordinate and Three-Coordinate Gold(I) Ions

This is the authors' abstract. We don't add key points for this paper.

High Resolution Image Download MS PowerPoint Slide Five new crystalline gold(I) complexes β-Au 2 (μ-dppm) 2 Br 2 ·2CH 2 Cl 2 ( 1 ), [Au 2 (μ- dppm) 2 Br]Br·2CH 2 Cl 2 ( 2 ), [Au 2 (μ-dppm) 2 Br](PF 6 ) ( 3 ), [Au 2 (μ-dppm) 2 Cl](BPh 4 )·3CH 2 Cl 2 ( 4 ) and [Au 2 (μ-dppm) 2 ]Cl(AsF 6 )·2CH 2 Cl 2 ( 5 ) (where dppm is bis(diphenylphosphino)methane) have been prepared and structurally characterized by single crystal X-ray diffraction. Colorless β-Au 2 (μ-dppm) 2 Br 2 ·2CH 2 Cl 2 ( 1 ) has centrosymmetric structure with two three-coordinate gold(I) ions held in close proximity by the dppm ligands. Crystals of [Au 2 (μ- dppm) 2 Br]Br·2CH 2 Cl 2 ( 2 ), [Au 2 (μ-dppm) 2 Br](PF 6 ) ( 3 ), and [Au 2 (μ-dppm) 2 Cl](BPh 4 )·3CH 2 Cl 2 ( 4 ) have a cation with an unusual arrangement that binds a two-coordinate gold(I) ion to a three-coordinate gold(I) ion through an aurophilic interaction. Whereas Au 2 (μ-dppm) 2 Cl(BPh 4 )·3CH 2 Cl 2 ( 4 ) has a chloride ion bound to only one of the gold ions in the complex, [Au 2 (μ-dppm) 2 ]Cl(AsF 6 )·2CH 2 Cl 2 ( 5 ) has an ion paired chloride ion that is symmetrically disposed between the two gold ions at a rather long distance. Each complex displays luminescence under UV irradiation.