Asensio Juan M, Gómez-Sal Pilar, Andrés Román, de Jesús Ernesto
Departamento de Química Orgánica y Química Inorgánica, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain.
Dalton Trans. 2017 May 23;46(20):6785-6797. doi: 10.1039/c7dt00643h.
The synthesis of palladium(ii) complexes containing N-heterocyclic carbene chelate ligands is reported. These chelate ligands have methylene or ethylene ring bridges and sulfonate, carbonate or ammonium functionalities to render the complexes soluble in water. Bis- [(bis-NHC)PdX] (X = Cl, Br or I) and tetra-carbene [(bis-NHC)Pd] complexes have been prepared and the crystal structures of two of them have been determined. The NHC ligand is coordinated to the metal center in normal (C2-bound) or abnormal (C4-bound) mode. Processes involving the formation of NHC-Pd bonds or the transfer of NHC ligands have been explored in water. The behavior of the bis-carbene complexes as catalysts for the aerobic oxidation of 1-phenylethanol is also discussed.
报道了含氮杂环卡宾螯合配体的钯（II）配合物的合成。这些螯合配体具有亚甲基或亚乙基环桥以及磺酸根、碳酸根或铵官能团，以使配合物可溶于水。已制备出双[（双-NHC）PdX]（X = Cl、Br或I）和四卡宾[（双-NHC）Pd]配合物，并测定了其中两种的晶体结构。NHC配体以正常（C2配位）或异常（C4配位）模式与金属中心配位。在水中探索了涉及形成NHC-Pd键或转移NHC配体的过程。还讨论了双卡宾配合物作为1-苯乙醇有氧氧化催化剂的行为。
