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| Type |
Symposium |
| Area |
Recent Trends in Metal-Organic Frameworks |
| Room No. |
Room 401+402 |
| Time |
THU 17:20-17:40 |
| Code |
INOR1-5 |
| Subject |
Investigation of Reaction Sites on Metal-Organic Frameworks-Based Catalysts |
| Authors |
Min Kim*, Nakcheol Jeong1,*
Department of Chemistry, Chungbuk National University, Korea
1Department of Chemistry, Korea University, Korea
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| Abstract |
The investigation of the reaction site is important when MOF (metal-organic framework)-based heterogeneous catalysts are employed, i.e., whether it is inside the crystals or on their surface. Especially, in the case of chiral MOF, the environment of reaction sites for stereoselectivity would vary according to their location. The comparison of reaction efficiency with substrate size has been widely used in discussions on this issue. If there is a threshold point where the reaction rate sharply decreased as the substrate size increased, the reaction of substrates up to that point in size is regarded as having proceeded inside the MOF channels. However, this interpretation should be carefully employed to determine and identify the reaction site in a MOF crystal.
In this presentation, a series of reactions will be compared to investigate and identify the reaction sites. Both Zn-mediated stoichiometric carbonyl-ene reaction and Ti-catalyzed carbonyl-ene reaction were individually performed and compared in homogeneous and heterogenous media with substrate size controls. In the stoichiometric reaction (by Zn), it was clearly demonstrated that the whole MOF crystal is working and the inside of pore is important part for stereoselectivity. However, if the reaction is catalytic (by Ti), it would mainly take place on the surface of the crystals, regardless of the substrate size. The detail comparison data along with particle size control experiments and two-photon microscopy images will be discussed.
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| E-mail |
minkim@chungbuk.ac.kr |
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123rd General Meeting of the KCS