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Comparison of Gas Sorption Properties of Neutral and Anionic Metal–Organic Frameworks Prepared from the Same Building Blocks but in Different Solvent Systems
Author(s) -
Choi MyungHo,
Park Hye Jeong,
Hong Dae Ho,
Suh Myunghyun Paik
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201303086
Subject(s) - sorption , metal organic framework , adsorption , solvent , selectivity , porosity , chemistry , bet theory , metal , inorganic chemistry , chemical engineering , organic chemistry , catalysis , engineering
Two different 3D porous metal–organic frameworks, [Zn 4 O(NTN) 2 ]⋅10 DMA⋅7 H 2 O ( SNU‐150 ) and [Zn 5 (NTN) 4 (DEF) 2 ][NH 2 (C 2 H 5 ) 2 ] 2 ⋅8 DEF⋅6 H 2 O ( SNU‐151 ), are synthesized from the same metal and organic building blocks but in different solvent systems, specifically, in the absence and the presence of a small amount of acid. SNU‐150 is a doubly interpenetrated neutral framework, whereas SNU‐151 is a non‐interpenetrated anionic framework containing diethylammonium cations in the pores. Comparisons of the N 2 , H 2 , CO 2 , and CH 4 gas adsorption capacities as well as the CO 2 adsorption selectivity over N 2 and CH 4 in desolvated SNU‐150′ (BET: 1852 m 2 g −1 ) and SNU‐151′ (BET: 1563 m 2 g −1 ) samples demonstrate that the charged framework is superior to the neutral framework for gas storage and gas separation, despite its smaller surface area and different framework structure.