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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Unprecedented Control of Organic Polyhedral Molecular Crystals by Solvent Addition Order and Anti-solvent Molecular Geometry

2018년 8월 22일 16시 18분 21초
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목 09시 : 14분
Material Chemisty - Oral Presentation of Young Material Chemists
저자 및
Yohwan Park, Hee Cheul Choi1,*
Department of Chemistry, Pohang University of Science and Technology, Korea
1Department of Chemistry, CALDES, Pohang University of Science and Technology, Institute for Basic Science, Korea
In this presentation, we report the elucidation of the effect of anti-solvent molecular geometry and solvent addition order on the determination of the morphology of molecular crystal toward the formation of organic polyhedral molecular crystal morphology without using chemical additives. Although organic polyhedron is greatly important for achieving desirable properties, its efficient growth without any additives remains as a big challenge. To achieve this, we developed the reverse anti-solvent crystallization (r-ASC) method [1] and revealed that the molecular geometry of anti-solvent and its addition order play a critical role in determining the morphology of the final molecular crystal. For this, we studied for tetra (4-aminophenyl) porphyrin (TAPP) in ethanol/xylene binary solvent system. When the r-ASC process was done for the TAPP, rod-, disk- and cube-shaped TAPP crystals were grown by using o-, m- and p-xylene anti-solvents, respectively. The three kinds of crystals have totally different crystal structures as confirmed by single crystal X-ray diffraction. The results show the three kinds of xylene geometry could affect numerous interacting sites to TAPP and the crystal growth direction because to the different solvent geometry alters the local supersaturation environment. These results are meaningful because not only it opens up a way to for the realization of quite rare organic polyhedral crystals, but also it would provide versatile opportunities for fundamental crystallization studies. Reference [1] Park, Y.; Hong, M.; Koo, J. Y.; Lee, M.; Lee, J.; Moon, D. J.; Sohn, S. H.; Joo, T.; Lim, W. T.; Lim, H.; Choi, H. C. Sci. Rep. 2017, 7, 2582.