New Motifs in Aurophilic Self-Assembly: Synthesis and Structures of [Au(NH=CMe_2)_3]CF_3SO_3 and [Au(C=CSiMe_3)(CNtBu)]

摘要

The triflate salt of the complex [Au(NH_3)_2]~+ prepared by Mingos et al. reacts very slowly with acetone to give the first iminogold(i) complex [Au(NH=CMe_2)_2]CF_3SO_3 (1, Scheme 1). In contrast to N-substituted ketimines (RN=CR'R"), NH-ketimines are, with the exception of the diaryl derivatives, unstable compounds that cannot be prepared by simple methods Thus, direct synthesis of NH-ketimines from ketones and ammonia requires an ammonium chloride catalyzed reaction at 50 bar pressure and 120 °C,or high temperature stabilization' in the HZSM-5 zeolite supercage (up to 520 K). The difficulties associated with preparing and handling these compiounds are such that few metal complexes containing acetimine, such as 1, are known. Recently, one tri- and one tetrametalated car-bodiimide have been reported.