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Structural elucidation of the mechanism of molecular recognition in chiral crystalline sponges
Date
2020
Abstract
To gain insight into chiral recognition in porous materials we have prepared a family of fourth generation chiral metal–organic frameworks (MOFs) that have rigid frameworks and adaptable (flexible) pores. The previously reported parent material, [Co2(S-mandelate) 2(4,4’-bipyridine)3](NO3)2, CMOM-1S, is a modular MOF; five new variants in which counterions (BF4 , CMOM-2S) or mandelate ligands are substituted (2-Cl, CMOM-11R; 3-Cl, CMOM-21R; 4-Cl, CMOM-31R; 4-CH3, CMOM-41R) and the existing CF3SO3 variantCMOM-3Sarestudiedherein. Fine-tuning of pore size, shape, and chemistry afforded a series of distinct host–guest binding sites with variable chiral separation properties with respect to three structural isomers of phenylpropanol. Structural analysis of the resulting crystalline sponge phases revealed that host–guest interactions, guest–guest interactions, and pore adaptability collectively determine chiral discrimination.
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Description
peer-reviewed
Publisher
John Wiley & Sons, Inc.
Citation
Angewandte International Edition Chemie;59, pp. 2-9
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Funding Information
Science Foundation Ireland (SFI)