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| Type |
Symposium |
| Area |
Bioinspired Inorganic Catalysis |
| Room No. |
Samda Hall B |
| Time |
FRI 10:15-: |
| Code |
INOR2-4 |
| Subject |
Progress towards Dinitrogen Reduction at a Homogeneous Catalyst |
| Authors |
Eunsung Lee
Department of Chemistry, Pohang University of Science and Technology, Korea |
| Abstract |
Catalytic dinitrogen reduction to N-products including ammonia in a practical homogeneous condition is one of the most challenging reactions in chemistry.1 Among various transition metal systems for the reduction, oxygen-donor ligands like triphenolate amines have been less studied.2 We have synthesized various Mo, Fe, and V complexes that contain newly designed bulky triphenolate amine ligand (TPA). Those three transition metals are the major components of nitrogenase that catalyze the transformation of dinitrogen to ammonia in nature. Three phenolates of the ligand that directly bind to a transition metal secure the stability of the complexes. In addition, three 1,3,5-triisopropylphenyl groups (TRIPs) of the ligand maximize a steric demand in a pocket that prevents the product from dinitrogen bimetallic formation. With these complexes, we have attempted to reduce N2 under various conditions. Although the reduction reactions with the complexes were not successful, we learned several important lessons from the challenging reaction, which will be discussed in the talk. Meanwhile, we have also investigated more simplified ligand systems such as N-donor-based ligands. To our surprise, the transition metal complexes with the simplified N-donor ligands fix N2 and reduce N2 under benign conditions. The details will be discussed.
References
1Hoffman, et al. Chem. Rev. 2014, 114, 4041.
2 Licini, et al. Dalton Trans. 2009, 5265.
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| E-mail |
eslee@postech.ac.kr |
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121st General Meeting of the KCS