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Hydrogen Storage in a Potassium‐Ion‐Bound Metal–Organic Framework Incorporating Crown Ether Struts as Specific Cation Binding Sites
Author(s) -
Lim DaeWoon,
Chyun Seung An,
Suh Myunghyun Paik
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201404265
Subject(s) - adsorption , moiety , hydrogen storage , chemistry , inorganic chemistry , sorption , crown ether , metal organic framework , metal , hydrogen , potassium , supercritical fluid , ether , metal ions in aqueous solution , binding energy , hydrogen bond , ion , crystallography , molecule , stereochemistry , organic chemistry , physics , nuclear physics
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 + , NH 4 + , and methyl viologen(MV 2+ ) through single‐crystal to single‐crystal transformations. It exhibits characteristic gas‐sorption properties depending on the bound cation. SNU‐200 activated with supercritical CO 2 shows a higher isosteric heat ( Q st ) of H 2 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 H 2 adsorption (9.92 kJ mol −1 ) as a result of the accessible open metal sites on the K + ion.