Hydrogen Storage in a Potassium-Ion-Bound Metal–Organic Framework Incorporating Crown Ether Struts as Specific Cation Binding Sites†
Dr. Dae-Woon Lim
Department of Chemistry, Seoul National University, Seoul 151-747 (Republic of Korea)
Current address: Neutron Science Division, Korea Atomic Energy Research Institute (KAERI), Daejeon, 305-353 (Republic of Korea)
Search for more papers by this authorSeung An Chyun
Department of Chemistry, Seoul National University, Seoul 151-747 (Republic of Korea)
Search for more papers by this authorCorresponding Author
Prof. Myunghyun Paik Suh
Department of Chemistry, Seoul National University, Seoul 151-747 (Republic of Korea)
Current address: Department of Chemistry, Hanyang University, Seoul 133-791 (Republic of Korea)
Department of Chemistry, Seoul National University, Seoul 151-747 (Republic of Korea)Search for more papers by this authorDr. Dae-Woon Lim
Department of Chemistry, Seoul National University, Seoul 151-747 (Republic of Korea)
Current address: Neutron Science Division, Korea Atomic Energy Research Institute (KAERI), Daejeon, 305-353 (Republic of Korea)
Search for more papers by this authorSeung An Chyun
Department of Chemistry, Seoul National University, Seoul 151-747 (Republic of Korea)
Search for more papers by this authorCorresponding Author
Prof. Myunghyun Paik Suh
Department of Chemistry, Seoul National University, Seoul 151-747 (Republic of Korea)
Current address: Department of Chemistry, Hanyang University, Seoul 133-791 (Republic of Korea)
Department of Chemistry, Seoul National University, Seoul 151-747 (Republic of Korea)Search for more papers by this authorThis work was supported by National Research Foundation of Korea (NRF) Grant funded by the Korean Government (MEST) (No. 2005-0093842). We acknowledge the Pohang Accelerator Laboratory (PAL) for the use of the synchrotron 2D(SMC) beamline. D.-W.L. acknowledges support by Basic Science Research Fellowship from Seoul National University.
Abstract
To develop a metal–organic framework (MOF) for hydrogen storage, SNU-200 incorporating a 18-crown-6 ether moiety as a specific binding site for selected cations has been synthesized. SNU-200 binds K+, NH4+, and methyl viologen(MV2+) through single-crystal to single-crystal transformations. It exhibits characteristic gas-sorption properties depending on the bound cation. SNU-200 activated with supercritical CO2 shows a higher isosteric heat (Qst) of H2 adsorption (7.70 kJ mol−1) than other zinc-based MOFs. Among the cation inclusions, K+ is the best for enhancing the isosteric heat of the H2 adsorption (9.92 kJ mol−1) as a result of the accessible open metal sites on the K+ ion.
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