| Summary: | 碩士 === 國立臺灣大學 === 化學研究所 === 101 === In recent years, bridging-type poly N-heterocylic carbenes attracted much attention, because each carbene moiety has opportunity to function independently. As a result, they are viewed as potential building blocks in extended materials. However, the reported synthetic routes for highly symmetrical bridging-type poly-NHCs were too complicated to broaden the application of such ligand system. In order to overcome these disadvantages, in this work, we developed a new synthetic strategy for highly symmetrical poly-NHCs using the assembly method. To this end, we designed and synthesized a bifunctional molecular building unit (4, 6) consisting of a carbene precursor and a phthalic anhydride group, which would undergo dehydrative condensation when treated with primary amines. By introducing different polyamino compounds, we can easily construct various poly-imidazolium salts (13-20). We also used these newly synthesized poly-NHCs to form the corresponding multi-nuclear metal complexes (21-29), which should find further applications in heterogeneous catalysis.
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