The reaction between an angular bis-imidazolidinium salt and [AuCl(SMe)₂] allowed the preparation of a discrete digold complex, with a rigid angular bridging bis-imidazolindiylidene ligand. This complex reacts with a diethynylcarbazole to afford a tetragold cyclophane that contains two bis-imidazolindiylidenes and two carbazolyl-diethynyl ligands. Both the dimetallic and the tetrametallic complexes have been characterized by spectroscopic techniques and by single-crystal X-ray diffraction. Due to the geometric constraints of the ligands, the cyclophane deviates from the expected planarity and shows a twisted structure. The work demonstrates that the rigid angular di-NHC ligand is a suitable scaffold for the reliable construction of organometallic-based metallosupramolecular assemblies.

中文翻译：

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熔融双-咪唑啉二亚甲基的扭曲的Tetragold环环烷

角双-咪唑啉鎓盐与[AuCl（SMe）₂ ]之间的反应允许制备具有刚性角桥联的双-咪唑啉二亚甲基配体的离散的digold络合物。该配合物与二乙炔基咔唑反应，得到四金环烷，其中含有两个双咪唑啉二亚基和两个咔唑基-二乙炔基配体。双金属和四金属配合物均已通过光谱技术和单晶X射线衍射表征。由于配体的几何约束，环烷偏离预期的平面度并显示出扭曲的结构。这项工作表明，刚性角状双-NHC配体是可靠构建有机金属基金属超分子组装体的合适支架。