Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 14, Pages 3737-3741Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201801116
Keywords
chirality; crystal engineering; homochiral frameworks; metal-organic frameworks; porous materials
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Funding
- NSF-DMR [1309347]
- CSULB RSCA award
- W. M. Keck Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1309347] Funding Source: National Science Foundation
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A new strategy for creating homochiral metal-organic frameworks through a fusion of pillaring and templating concepts is demonstrated. This strategy makes use of the synergy among various chemical interactions during self-assembly processes, and leads to the synthesis of a series of homochiral frameworks. In the presence of only pillar-to-pillar - interactions, inter-pillar forces compete against metal-pillar interactions, resulting in mismatch between pillar-to-pillar and metal-to-metal separations and consequently 2D materials without pillaring. To create 3D materials, a method was developed to use various aromatic molecules, polycyclic aromatic hydrocarbons in particular, as templates to modulate the inter-pillar interaction and separation, leading to the formation of 3D homochiral frameworks. The use of aromatic molecules, especially hydrocarbons, as structure-directing agents, represents a new approach in the development of crystalline porous materials. Aromatic templates can be post-synthetically extracted to yield flexible porous homochiral materials with gate-opening gas sorption behaviors for both N-2 and CO2 at partial pressures tunable by temperature.
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