Gold(i) complexes bearing mixed-donor ligands derived from N-heterocyclic carbenes
作者:Eugene Y. Chia、Saira Naeem、Lionel Delaude、Andrew J. P. White、James D. E. T. Wilton-Ely
DOI:10.1039/c0dt01613f
日期:——
SIMes·COS (SIMes = 1,3-bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene) were used to prepare [(L)Au(SOC·IMes)]+ and [(L)Au(SOC·SIMes)]+ from [(L)AuCl] (L = PPh3, CNtBu). The bimetallic examples [(dppf)Au(SOC·IMes)}2]2+ and [(dppf)Au(SOC·SIMes)}2]2+ were synthesized from the reaction of [(dppf)(AuCl)2] with the appropriate ligand. Reaction of [(tht)AuCl] with one equivalent of IMes·COS or SIMes·COS yields
Five imidazol(in)ium-2-thiocarboxylates bearing cyclohexyl, mesityl, or 2,6-diisopropylphenyl substituents on their nitrogen atoms were prepared from the corresponding imidazol(in)ium chlorides or tetrafluoroborates in a one-pot, two-step procedure involving the in situ generation of free N-heterocyclic carbenes (NHCs) with a strong base followed by trapping with carbonyl sulfide. The resulting NHC·COS
iocarboxylate zwitterions bearing cyclohexyl, 2,4,6-trimethylphenyl (mesityl), or 2,6-diisopropylphenyl groups on their nitrogen atoms in CH2Cl2 at −20 °C. All the products were fully characterized by IR and NMR spectroscopy, and the molecular structures of [RuCl2(p-cymene)(SOC·IMes)] (3) and [RuCl2(p-cymene)(SOC·SIMes)] (5) were determined by X-ray diffraction analysis. Coordination of the NHC·COS