122nd General Meeting of the KCS

Type Poster Presentation
Area Inorganic Chemistry
Room No. Grand Ballroom
Time 10월 19일 (금요일) 11:00~12:30
Code INOR.P-37
Subject A new breathing three-dimensional Zn-MOF with Lewis basic nitrogen-rich channels: selective carbon dioxide sorption
Authors Hyun-Chul Kim, Seong Huh, Sung-Jin Kim1, Youngmee Kim2,*, Do Nam Lee3
Department of Chemistry, Hankuk University of Foreign Studies, Korea
1Department of Chemistry, Ewha Womans University, Korea
2Department of Chemistry and Nano Science, Ewha Womans University, Korea
3Ingenium College of Liberal arts, Kwangwoon University, Korea
Abstract Openly accessible Lewis basic sites orderly located inside the well-defined channels of metal–organic frameworks (MOFs) are potentially ideal active sites for selective gas sorption and catalysis. A new C2h-symmetric dicarboxylate-based bridging ligand, 3,3’-(pyrazine-2,5-diyl)dibenzoic acid (3,3’-PDBA) was prepared by a Suzuki coupling reaction, and two new Zn-MOFs containing the C2h-symmetric 3,3’-PDBA bridging ligand and two different bis(pyridyl)-based pillars (1,2-bis(4-pyridyl)ethane (bpa) or 1,2-bis(4-pyridyl)ethylene (bpe)) were prepared through a thermal reaction in DMF. Two Zn-MOFs of the general formula of three-dimensional (3D) [Zn2(μ4-3,3’-PDBA)2(μ2-bpa)]3·(DMF)5(H2O)13 (1) or 3D-like 2D [Zn2(μ4-3,3’-PDBA)2(μ2-bpe)]·(H2O) (2) with primitive cubic pcu net and 2D sql net, respectively. Both Zn-MOFs 1 and 2 contain uncoordinated Lewis basic pyrazinyl nitrogen atoms in the frameworks. Zn-MOF 1 with openly accessible Lewis basic sites exhibited selective sorption of CO2 over N2, H2, and CH2 at low temperature. The adsorption and desorption isotherms for CO2 sorption at 196 K showed phenomenal hysteretic behaviour indicative of a breathing process through an adsorbate-discriminatory gate-opening process toward CO2 at a low gas pressure.
E-mail khc@hufs.ac.kr