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Tunable Metal–Organic Frameworks Based on 8‐Connected Metal Trimers for High Ethane Uptake
Ist Teil von
Small (Weinheim an der Bergstrasse, Germany), 2021-06, Vol.17 (22), p.e2003167-n/a
Ort / Verlag
Weinheim: Wiley Subscription Services, Inc
Erscheinungsjahr
2021
Quelle
Wiley Online Library
Beschreibungen/Notizen
Metal trimers [M3(O/OH)](OOCR)6 are among the most important structural building blocks. From these trimers, a great success has been achieved in the design of 6‐ or 9‐connected framework materials with various topological features and outstanding gas‐sorption properties. In comparison, 8‐connected trimer‐based metal–organic frameworks (MOFs) are rare. Given multiple competitive pathways for the formation of 6‐ or 9‐connected frameworks, it remains challenging to identify synthetic or structural parameters that can be used to direct the self‐assembly process toward trimer‐based 8‐connected materials. Here, a viable strategy called angle bending modulation is revealed for creating a prototypical MOF type based on 8‐connected M3(OH)(OOCR)5(Py‐R)3 trimers (M = Zn, Co, Fe). As a proof of concept, six members in this family are synthesized using three types of ligands (CPM‐80, ‐81, and ‐82). These materials do not possess open‐metal sites and show excellent uptake capacity for various hydrocarbon gas molecules and inverse C2H6/C2H4 selectivity. CPM‐81‐Co, made from 2,5‐furandicarboxylate and isonicotinate, features selectivity of 1.80 with high uptake capacity for ethane (123 cm3 g−1) and ethylene (113 cm3 g−1) at 298 K and 1 bar.
A series of open‐metal‐site‐free metal–organic frameworks (MOFs) based on 8‐connected metal trimers is developed by using a synthetic strategy called angle bending modulation. Despite the absence of open metal sites as binding sites, these materials exhibit excellent ethane uptake capacity and high inverse C2H6/C2H4 separation selectivity.