Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 20, Issue 32, Pages 9879-9882Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201403524
Keywords
chirality; computational chemistry; enantioselectivity; oriented circular dichroism; surface-anchored metal-organic framework
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1362]
- Deutsche Forschungsgemeinschaft (DFG) through the Center for Functional Nanostructures (CFN) [C3.3]
- China Scholarship Council (CSC)
- Landesstiftung Baden-Wurttemberg GmbH
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1362]
- Deutsche Forschungsgemeinschaft (DFG) through the Center for Functional Nanostructures (CFN) [C3.3]
- China Scholarship Council (CSC)
- Landesstiftung Baden-Wurttemberg GmbH
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Oriented circular dichroism (OCD) is explored and successfully applied to investigate chiral surface-anchored metal-organic frameworks (SURMOFs) based on camphoric acid (D-and Lcam) with the composition [Cu-2-(Dcam)(2x)(Lcam)(2-2x)(dabco)](n) (dabco= 1,4-diazabicyclo-[2.2.2]-octane). The three-dimensional chiral SURMOFs with high-quality orientation were grown on quartz glass plates by using a layer-by-layer liquid-phase epitaxy method. The growth orientation, as determined by X-ray diffraction (XRD), could be switched between the [001] and [110] direction by using either OH-or COOH-terminated substrates. These SURMOFs were characterized by using OCD, which confirmed the ratio as well as the orientation of the enantiomeric linker molecules. Theoretical computations demonstrate that the OCD band intensities of the enantiopure [Cu-2(Dcam)(2)(dabco)](n) grown in different orientations are a direct result of the anisotropic nature of the chiral SURMOFs. Finally, the enantiopure [Cu-2(Dcam)(2)(dabco)](n) and [Cu-2(Lcam)(2)(dabco)](n) SURMOFs were loaded with the two chiral forms of ethyl lactate [(+)-ethyl-d-lactate and (-)-ethyl-L-lactate)]. An enantioselective enrichment of > 60% was observed by OCD when the chiral host scaffold was loaded from the racemic mixture.
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