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Flexibility and Sorption Selectivity in Rigid Metal–Organic Frameworks: The Impact of Ether‐Functionalised Linkers
Author(s) -
Henke Sebastian,
Schmid Rochus,
Grunwaldt JanDierk,
Fischer Roland A.
Publication year - 2010
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.201002341
Subject(s) - dabco , sorption , selectivity , octane , alkyl , metal organic framework , ether , chemistry , linker , molecule , materials science , polymer chemistry , inorganic chemistry , organic chemistry , catalysis , adsorption , computer science , operating system
The functionalisation of well‐known rigid metal–organic frameworks (namely, [Zn 4 O(bdc) 3 ] n , MOF‐5, IRMOF‐1 and [Zn 2 (bdc) 2 (dabco)] n ; bdc=1,4‐benzene dicarboxylate, dabco=diazabicyclo[2.2.2]octane) with additional alkyl ether groups of the type ‐O‐(CH 2 ) n ‐O‐CH 3 ( n = 2–4) initiates unexpected structural flexibility, as well as high sorption selectivity towards CO 2 over N 2 and CH 4 in the porous materials. These novel materials respond to the presence/absence of guest molecules with structural transformations. We found that the chain length of the alkyl ether groups and the substitution pattern of the bdc‐type linker have a major impact on structural flexibility and sorption selectivity. Remarkably, our results show that a high crystalline order of the activated material is not a prerequisite to achieve significant porosity and high sorption selectivity.