IIQ
M.F. Espada, J. Campos, J. López-Serrano, M.L. Poveda, E. Carmona Angew. Chem. Int. Ed. 2015, Vol. 0, doi:10.1002/anie.201508931
Reactions of the gold(I) triflimide complex [Au(NTf2)(PMe2Ar)] (1) with the gold(I) hydrocarbyl species [AuR(PMe2Ar)] (2 a–2 c) enable the isolation of hydrocarbyl-bridged cationic digold complexes with the general composition [Au2(μ-R)(PMe2Ar)2][NTf2], where Ar=C6H3-2,6-(C6H3-2,6-iPr2)2 and R=Me (3), CHCH2 (4), or CCH (5). Compound 3 is the first alkyl-bridged digold complex to be reported and features a symmetric [Au(μ-CH3)Au]+ core. Complexes 4 and 5 are the first species of their kind that contain simple, unsubstituted vinyl and acetylide units, respectively. In the series of complexes 3–5, the bridging carbon atom systematically changes its hybridization from sp3 to sp2 and sp. Concomitant with this change, and owing to variations in the nature of the bonding within the [Au(μ-R)Au]+ unit, there is a gradual decrease in aurophilicity, that is, the strength of the Au⋅⋅⋅Au bonding interaction decreases. This change is illustrated by a monotonic increase in the Au–Au distance by approximately 0.3 Å from R=CH3 (2.71 Å) to CHCH2 (3.07 Å) and CCH (3.31 Å).
Los artículos seleccionados serán destacados como 'Artículos del mes' y participarán en el Premio de Investigación cicCartuja-Ebro Foods. Se concederá un Premio de 10.000 euros al ganador y dos Accésits de 5.000 euros cada uno al segundo y tercer clasificados.