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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Morphology-retained photo-conversion reaction of anthracene single crystal: a new approach for organic heterostructures

등록일
2018년 8월 22일 15시 48분 24초
접수번호
1004
발표코드
MAT.O-2 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 09시 : 07분
발표형식
구두발표
발표분야
Material Chemisty - Oral Presentation of Young Material Chemists
저자 및
공동저자
Jinyoung Koo*, Hee Cheul Choi*
Department of Chemistry, Institute for Basic Scien, Pohang University of Science and Technology, Korea
The morphology of organic single crystal heavily affects its optical and electrical properties as these properties are determined by molecular arrangements in the crystal, and the morphologies generally reflect the molecular arrangements. In this presentation, we report the solid-state photo-conversion reaction of disk shape anthracene (AN) crystal into 9,10-anthraquinone (ANQ) and dipara-anthracene (DPA) crystals with the original crystal morphology retained. It should be noted that it is difficult to obtain such disk shape ANQ and DPA crystals by conventional crystallization methods, but they were realized by photo-conversion reaction of disk shape AN crystal. Time-dependent observation revealed the reaction mechanism as the photo-oxidation proceeded from the edge of the AN crystal due to oxygen diffusion while photo-dimerization occurs randomly. Interestingly, the electrical conductivity of photo-converted 9,10-anthraquinone (PC-ANQ) crystal is about five orders of magnitude higher than that of the starting AN crystal while the photo-converted dipara-anthracene (PC-DPA) crystal exhibits a decreased conductivity. Structural contributions to electrical conductivity differences were investigated by X-ray diffraction (XRD) and single crystal phase indexing, we revealed that the solid-phase photoreaction could induce molecular rearrangement. The remarkable advantage of solid-state photochemical reaction is that the reaction area is readily controlled by light irradiation area. By taking this advantage, we found a new approach to synthesize the lateral heterostructures (AN-ANQ, AN-DPA, and ANQ-DPA) by area-selective photoreaction using a chrome photomask.

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