Porphyrin Boxes: Rationally Designed Porous Organic Cages |
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| Authors: | Soonsang Hong Dr Md Rumum Rohman Dr Jiangtao Jia Dr Youngkook Kim Dr Dohyun Moon Dr Yonghwi Kim Dr Young Ho Ko Prof?Dr Eunsung Lee Prof?Dr Kimoon Kim |
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| Affiliation: | 1. Center for Self‐assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 790‐784 (Republic of Korea) http://csc.ibs.re.kr/;2. Department of Chemistry, Pohang University of Science and Technology, Pohang 790‐784 (Republic of Korea);3. Beamline Department, Pohang University of Science and Technology, Pohang 790‐784 (Republic of Korea);4. Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790‐784 (Republic of Korea) |
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| Abstract: | The porphyrin boxes ( PB‐1 and PB‐2 ), which are rationally designed porous organic cages with a large cavity using well‐defined and rigid 3‐connected triangular and 4‐connected square shaped building units are reported. PB‐1 has a cavity as large as 1.95 nm in diameter and shows high chemical stability in a broad pH range (4.8 to 13) in aqueous media. The crystalline nature as well as cavity structure of the shape‐persistent organic cage crystals were intact even after complete removal of guest molecules, leading to one of the highest surface areas (1370 m2g?1) among the known porous organic molecular solids. The size of the cavities and windows of the porous organic cages can be modulated using different sized building units while maintaining the topology of the cages, as illustrated with PB‐2 . Interestingly, PB‐2 crystals showed unusual N2 sorption isotherms as well as high selectivity for CO2 over N2 and CH4 (201 and 47.9, respectively at 273 K at 1 bar). |
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| Keywords: | chemical stability organic cages permanent porosity porphyrins selective gas sorption |
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