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제126회 대한화학회 학술발표회 및 총회 Chemical Patterning in Single Crystals of Metal–Organic Frameworks by Photo-Cycloaddition Reaction in a Single-Crystal-to-Single-Crystal manner

등록일
2020년 9월 14일 17시 28분 05초
접수번호
1057
발표코드
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발표시간
10월 21일(수) 17:30~18:00
발표형식
포스터
발표분야
Inorganic Chemistry
저자 및
공동저자
In-Hyeok Park, Eunji Lee1, Shim Sung Lee2,*, Jagadese J. Vittal3,*
Graduate School of Analytical Science and Technology, Chungnam National University, Korea
1Department of Chemistry, Gangneung-Wonju National University, Korea
2Department of Chemistry, Gyeongsang National University, Korea
3Department of Chemistry, National University of Singapore, Singapore
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승인 1건
Metal-organic framework (MOFs) structures are known to exhibit unusual structural flexibility in response to exchange of guest molecules present in the voids. Here we demonstrate that the guest solvent molecules in the voids have a great influence on the outcome of the solid state photochemical reactions in three highly strained Cd(II) MOFs with cds topology [1]. In the railroad track-like [Cd2(bpe)2] chains of the three MOFs, the olefin bond pairs in the bpe (4,4’-bipyridylethylene) ligands undergo photochemical [2+2] cycloaddition reaction under UV light in a single-crystal-to-single-crystal (SCSC) manner. For instance, partial photoreaction in two MOFs with no guest solvent and DMA respectively led to the formation of two photoproducts, ABAB type and AABBAABB type (where A and B are unreacted bpe pairs and cyclobutane rings, respectively). Surprisingly, the MOF with DMF lattice solvent undergoes 100% photoreaction but leading to the photoproduct with broken chains of [Cd2(rctt-tpcb)2] that resembles damaged railroad track. In other words, the strain created by the quantitative formation of cyclobutane rings, is released by breaking one of the rails. More interesting examples are waiting to be explored in the future to underline the role played by the guest solvents on the physical and chemical properties of MOFs.

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