2000/10/28 by S. Canales, Silvia Canales, Olga Crespo +5 · 1 citation
Chemistry · Materials Science · #Organometallic Complex Synthesis and Catalysis #Nanocluster Synthesis and Applications #Organometallic Compounds Synthesis and Characterization
paper · doi:10.1021/om000119g
The compounds [Se(AuPPh 3 ) 2 ] and [Se(Au 2 dppf)] are good precursors for the synthesis of highly aurated selenium-centered derivatives. Thus the reaction of [Se(AuPPh 3 ) 2 ] with various molar ratios of [Au(OTf)PPh 3 ] affords the homoleptic species [Se(AuPPh 3 ) n ](OTf) n - 2 ( n = 3−6). Similarly, the treatment of [Se(Au 2 dppf)] with various stoichiometric ratios of [Au 2 (OTf) 2 (μ-dppf)] gives the polynuclear derivatives [(Au 2 dppf)Se(Au 2 dppf) 2 ](OTf) 2, [Se(Au 2 dppf) 2 ](OTf) 2, and [Se(Au 2 dppf) 3 ](OTf) 4 . The compounds [AuSe(AuPPh 3 ) 2 2 ]ClO 4 and [AuSe(Au 2 dppf) 2 ]ClO 4 have been obtained by reaction of the precursors with [Au(tht) 2 ]ClO 4 in a molar ratio of 2:1. Some of these derivatives have been characterized by X-ray diffraction studies and show unusual geometries, associated with gold−gold interactions. The latter have been studied theoretically using [Se(AuPH 3 ) n ] ( n - 2)+ ( n = 2−6) models at the HF and MP2 levels with quasi-relativistic pseudopotentials. There is a good agreement between experimental and theoretical geometries.