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(Dec. 16) Postsynthetic Modification of Metal-Organic Frameworks

Last updated :2019-12-14

Topic: Postsynthetic Modification of Metal-Organic Frameworks
Speaker: Professor Myoung Soo Lah
(Ulsan National Institute of Science and Technology)
Host: Professor SU Chengyong
Time: 9:30-10:30, Monday, December 16, 2019
Venue: A403, Fulan Academic Center, Fong Shing Hall, Guangzhou South Campus, SYSU

Abstract:
Stepwise approaches can be used to obtain a variety of metal-organic frameworks (MOFs) that are not attainable by one-pot solvothermal reaction. The transmetalated MOF could be obtained by soaking an MOF in the solution of a new replacing metal ion. By simply controlling the soaking time, not only fully transmetalated isostructural framework structure but also selectively transmetalated core-shell bimetallic structure could be prepared. The ligand exchanged MOFs could also be obtained via soaking an MOF in the solution of a new replacing ligand. By controlling the concentration of the replacing ligand, not only an entropically favorable MOF with completely exchanged ligand but also enthalpically favorable MOF with selectively exchanged ligand in the alternating layers could be obtained. Non-interpenetrated 3D MOFs with both an interpenetration-favorable (3,5)-c hms topology and an interpenetration-unfavorable (3,5)-c gra topology are converted to doubly interpenetrated analogues with hms-c topology by thermal treatment, even in the absence of solvent. While the one-pot reaction of zirconium metal ion with a mixture of two dicarboxylate heterolinkers yielded a 12-c fcu Zr MOF with randomly distributed linkers, the symmetry-guided stepwise reaction produced the same MOF with both linkers precisely located in the framework. Linear BDC2 derivatives of (pseudo)mmm symmetry were inserted into the mmm-symmetry sites of the flexible Zr MOF with 8-c bcu topology (ZRN-bcu), which is composed of zigzag 2,6-naphthalenedicarboxylic acid with 2/m symmetry.

About the speaker:
Prof. Myoung Soo Lah obtained his B.S. and M.S. degree from Seoul National University, Korea in 1982 and 1984, respectively. Later, he went to the University of Michigan, Ann Arbor in US, where he obtained his PhD in 1991 and worked as a Research Investigator at the University of Michigan at Ann Arbor until 1992. He returned to the Korea and joined in the Hanyang University as a full professor in 1992, and moved to Ulsan National Institute of Science and Technology in 2010. Currently, he is the Director of the Science Research Center at the Ulsan National Institute of Science and Technology, the Vice President of Korean Crystallographic Association, and Committee Member of the Committee of the International Affairs of Korean Chemical Society. He is research interests include metal-organic frameworks, crystal engineering and supramolecular coordination chemistry. He has published over 180 papers in well-known journal including Chem. Soc. Rev., J. Am. Chem. Soc., Nature Comm. and PNAS. Moreover, he has been awarded many honors, including the KCS Inorganic Chemistry Division Award for Excellent Research in 2007, the Best Researcher Award at Hanyang University in 2007 and 2008, and the KCS/Sigma-Aldrich Excellent Chemist Award in 2009.