title: Porphyrin Boxes: Rationally Designed Porous Organic Cages.
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 m(2) g(-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).
authors: Center for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 790-784 (Republic of Korea) http://csc.ibs.re.kr/|Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784 (Republic of Korea).
authors: Soonsang
authors: S
authors: Hong
authors: Center for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 790-784 (Republic of Korea) http://csc.ibs.re.kr/
authors: Md Rumum
authors: MR
authors: Rohman
authors: Center for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 790-784 (Republic of Korea) http://csc.ibs.re.kr/
authors: Jiangtao
authors: J
authors: Jia
authors: Center for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 790-784 (Republic of Korea) http://csc.ibs.re.kr/
authors: Youngkook
authors: Y
authors: Kim
authors: Beamline Department, Pohang University of Science and Technology, Pohang 790-784 (Republic of Korea).
authors: Dohyun
authors: D
authors: Moon
authors: Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784 (Republic of Korea).
authors: Yonghwi
authors: Y
authors: Kim
authors: Center for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 790-784 (Republic of Korea) http://csc.ibs.re.kr/
authors: Young Ho
authors: YH
authors: Ko
authors: Center for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 790-784 (Republic of Korea) http://csc.ibs.re.kr/|Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784 (Republic of Korea).
authors: Eunsung
authors: E
authors: Lee
authors: Center for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 790-784 (Republic of Korea) http://csc.ibs.re.kr/. kkim@postech.ac.kr.|Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784 (Republic of Korea). kkim@postech.ac.kr.|Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790-784 (Republic of Korea). kkim@postech.ac.kr.
authors: Kimoon
authors: K
authors: Kim
keywords: chemical stability; organic cages; permanent porosity; porphyrins; selective gas sorption