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  • 09월 05일 23시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제128회 대한화학회 학술발표회, 총회 및 기기전시회 Postsynthetic modifications of metal–organic frameworks and their applications

2021년 9월 23일 09시 32분 30초
AWARD-1 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 13시 : 30분
KCS - Award Lecture
저자 및
Myoung Soo Lah
Department of Chemistry, Ulsan National Institute of Science and Technology, Korea
Stepwise approaches can be used to obtain a variety of metal–organic frameworks (MOFs) that are not attainable by one-pot solvothermal reaction. MOF-74 is one of the most explored MOFs, but its functionalization is limited to the dative post-synthetic modification (PSM) of the monodentate solvent site. Owing to the nature of the organic ligand and framework structure of MOF-74, the covalent PSM of MOF-74 is very demanding. The covalent PSM of the amino group of amino-tagged defective Ni-MOF-74, which is prepared by de novo solvothermal synthesis using aminosalicylic acid as a functionalized fragmented organic ligand, generates metal-binding sites, and subsequent post-synthetic metalation with Pd(II) ions affords Pd(II)-incorporated Ni-MOF-74 catalyst. This catalyst exhibits highly efficient, size-selective, and recyclable catalytic activity for the Suzuki–Miyaura cross-coupling reaction. Meanwhile, a MOF having superprotonic conductivity is prepared by dative PSM of MOF-808. The activation of the sulfamate (SA)-grafted MOF-808 changes the binding mode of the grafted SA from monodentate to bridging bidentate, thus converting the neutral amido (–S–NH2) moiety of the grafted SA to the more acidic cationic sulfiliminium (–S=NH2+) moiety. The MOF with sulfiliminium moiety is found to have a proton conductivity of 7.89 × 10-2 S/cm. Moreover, this superprotonic conductivity is well maintained over 1000 cycles of conductivity measurements and for similar cyclic measurements each day for seven days.