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  • 02월 19일 10시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제121회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Progress towards Dinitrogen Reduction at a Homogeneous Catalyst

2018년 2월 6일 17시 10분 54초
INOR2-4 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 10시 : 15분
Inorganic Chemistry - Bioinspired Inorganic Catalysis
저자 및
Eunsung Lee
Department of Chemistry, Pohang University of Science and Technology, Korea
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.