1608996-73-1Relevant articles and documents
Comparison of gas sorption properties of neutral and anionic metal-organic frameworks prepared from the same building blocks but in different solvent systems
Choi, Myung-Ho,Park, Hye Jeong,Hong, Dae Ho,Suh, Myunghyun Paik
, p. 17432 - 17438 (2013)
Two different 3D porous metal-organic frameworks, [Zn4O(NTN) 2]×10 DMA×7 H2O (SNU-150) and [Zn 5(NTN)4(DEF)2][NH2(C 2H5)2]2×8 DEF×6 H 2O (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, H2, CO2, and CH4 gas adsorption capacities as well as the CO2 adsorption selectivity over N 2 and CH4 in desolvated SNU-150 (BET: 1852 m2 g-1) and SNU-151 (BET: 1563 m2 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. Choice selection: A neutral metal-organic framework (MOF) (SNU-150) and an anionic MOF with a cationic guest (SNU-151; see figure) have been prepared from the same molecular building blocks but in different solvents. Despite its smaller surface area, SNU-151 exhibits higher uptake capacities, higher isosteric heats of H2, CO2, and CH4 adsorption, and greater CO2 adsorption selectivities over N 2 and CH4 than SNU-150, because of the charged framework and guests.