Organisch-Chemisches Institut, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 270, D-69120, Heidelberg, Germany.
Dalton Trans. 2009 Sep 21(35):7152-67. doi: 10.1039/b907041a. Epub 2009 Jul 22.
A new and highly flexible biscarbene ligand with two imidazolin-2-ylidene moieties in 6,6'-position of a 2,2'-bipyridine was prepared and structurally characterised by X-ray analysis. Various silver complexes were prepared from the imidazolium salts. Depending on the counterion, the coordination mode of the ligand can be mono- or bidentate. Pd complexes are feasible directly from the imidazolium salt using palladium(II)-acetate or via transmetallation from silver carbene complexes with [PdCl(2)(CH(3)CN)(2)] or [PdCl(2)(COD)]. Controlled by the structure of the silver complexes the biscarbenebipyridine ligand is a di- or tetracoordinating ligand forming mono- or dinuclear complexes. The high flexibility of this ligand is confirmed by transmetallation from silver to copper, which results in formation of a dinuclear copper complex with two bridging biscarbene ligands.
一种新型的、高度灵活的双卡宾配体，具有两个位于 2,2'-联吡啶 6,6'-位的咪唑啉-2-亚基。通过 X 射线分析对其进行了结构表征。通过咪唑𬭩盐制备了各种银配合物。根据抗衡离子的不同，配体的配位方式可以是单齿或双齿。可以直接从咪唑𬭩盐使用醋酸钯(II)或通过银卡宾配合物与[PdCl2(CH3CN)2]或[PdCl2(COD)]的转金属作用来制备 Pd 配合物。通过银配合物的结构控制，双卡宾联吡啶配体是一种二配位或四配位配体，形成单核或双核配合物。该配体的高灵活性通过从银到铜的转金属作用得到证实，这导致形成了一个具有两个桥联双卡宾配体的双核铜配合物。
