| Summary: | 碩士 === 國立臺灣大學 === 化學研究所 === 100 === For more than decades, the syntheses and coordination chemistry of N-heterocyclic carbenes remain one of the most popular fields of chemical research. Recent development in NHCs showed that the role of NHC has shifted from a strong donating ligand in metal complexes to the bridging unit in oligomeric and polymeric materials. Nowadays all of the reported poly-NHCs are synthesized via stepwise procedures with organic molecular backbones. When one would like to change the symmetry of poly-NHCs, a new molecular backbone and, possibly, new synthetic route has to be applied. This may be the reason why the research of poly-NHCs is still limited. In this work, we synthesized a bifunctional ligand, which features an imidazolium unit on one side of the molecule and a carboxylic acid group on the other side, and investigated its potential in forming poly-NHCs via assembly approach. The resulting poly-NHC ligands are envisioned to possess numerous geometries with metal-cluster or metal-oxide cluster as molecular backbone. The selection of metal ions includes zinc, copper, cobalt and iron, and the structure of poly-NHCs can range from low-symmetric C2 ligand to highly symmetric paddle wheel and octahedral geometry. All of these poly-NHCs are potential bridging ligands for metal-organic framework.
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