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Topology Conversion and Mesopore Generation in Metal-Organic Frameworks

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Title
Topology Conversion and Mesopore Generation in Metal-Organic Frameworks
Author
Jeong, Seok
Advisor
Lah, Myoung Soo
Issue Date
2019-08
Publisher
Graduate School of UNIST
Abstract
Part 1 Non-interpenetrated three-dimensional (3D) metal−organic frameworks (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. Depending on the conversion temperature and the properties of the pillaring ligand in the non-interpenetrated 3D MOF, which is based on two-dimensional sheets with 3-c hcb topology pillared by neutral ditopic linkers, the pillaring ligands in the interpenetrated MOFs produced are partially removed during the thermal conversions, leading to interpenetrated MOFs that simultaneously contain both micro- and mesopores. Part 2 As opposed to the growth mechanisms of metal-organic frameworks (MOFs) known to date, [Ni(HBTC)(bipy)] is thought to follow an crystallization by particle attachment (CPA), which means, a large number of domains are attached to form single crystal. On the other hand, non-interpenetrated [Ni(HBTC)(bipy)] is converted to doubly interpenetrated [Ni(HBTC)(bipy)] through thermal treatment. We report the mechanism of a new mesopore generation that has not been encountered so far, combining these two characteristics. It can also control the size of mesopores according to thermal treatment conditions.
Description
Department of Chemistry
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