A series of bimetallic and trimetallic complexes has been prepared by N-alkylation of mononuclear half-sandwich rhodium and iridium di-NHC complexes featuring bidentate chelate ligands composed of a classical NHC and a C-azolato donor. The shape and the separation between metal centers in the obtained complexes are highly dependent on the alkylating agent used. While the polynuclear complexes were formed as diastereomeric mixtures according to NMR spectroscopy, X-ray diffraction analysis revealed their remarkable preference to crystallize as meso compounds. The reactivity of the bimetallic, olefin-bridged complexes in electrophilic addition reactions has been investigated.

中文翻译：

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后合成修饰带有C-azolato配体的半三明治铑和铱配合物，制备多核NHC复合物†

通过单核半三明治铑和铱二-NHC配合物的N-烷基化反应制备了一系列双金属和三金属配合物，这些配合物具有由经典的NHC和C-azolato供体组成的双齿螯合配体。所得络合物中金属中心的形状和间隔高度取决于所用的烷基化剂。尽管根据NMR光谱将多核络合物形成为非对映异构体混合物，但X射线衍射分析显示出其显着的结晶倾向为内消旋化合物。已经研究了双金属烯烃桥联配合物在亲电加成反应中的反应性。