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Differential Adsorption of l ‐ and d ‐Lysine on Achiral MFI Zeolites as Determined by Synchrotron X‐Ray Powder Diffraction and Thermogravimetric Analysis
Author(s) -
Chen Tianxiang,
Huang Bolong,
Day Sarah,
Tang Chiu Chung,
Tsang Shik Chi Edman,
Wong Kwokyin,
Lo Tsz Woon Benedict
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201909352
Subject(s) - thermogravimetric analysis , powder diffraction , chemistry , rietveld refinement , adsorption , circular dichroism , crystallography , enantiomer , microporous material , stereochemistry , organic chemistry , crystal structure
Reported here is the first crystallographic observation of stereospecific bindings of l ‐ and d ‐lysine (Lys) in achiral MFI zeolites. The MFI structure offers inherent geometric and internal confinement effects for the enantiomeric difference in l ‐ and d ‐Lys adsorption. Notable differences have been observed by circular dichroism (CD) spectroscopy and thermogravimetric analysis (TGA). Distinct l ‐ and d ‐Lys adsorption behaviours on the H‐ZSM‐5 framework have been revealed by the Rietveld refinement of high‐resolution synchrotron X‐ray powder diffraction (SXRD) data and the density‐functional theory (DFT) calculations. Despite demonstrating the approach for l ‐ and d ‐Lys over MFI zeolites at an atomistic resolution, the differential adsorption study sheds light on the rational engineering of molecular interaction(s) with achiral microporous materials for chiral separation purposes.