Differential Adsorption of l‐ and d‐Lysine on Achiral MFI Zeolites as Determined by Synchrotron X‐Ray Powder Diffraction and Thermogravimetric Analysis. (27th November 2019)

• Record Type: Journal Article
• Authors: Chen, Tianxiang; Huang, Bolong; Day, Sarah; Tang, Chiu Chung; Tsang, Shik Chi Edman; Wong, Kwok‐yin; Lo, Tsz Woon Benedict
• Is Part Of: Angewandte Chemie. Volume 132:Number 3(2020)
• Page Start: 1109
• Page End: 1113
• Publication Date: 2019-11-27
• Subjects: Chiralität -- Circulardichroismus -- Materialwissenschaften -- Strukturaufklärung -- Röntgenbeugung; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201909352
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: 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. Abstract : Verhaltensunterschiede : Das differentielle Adsorptionsverhalten von l ‐ und d ‐Lys über H‐ZSM‐5 wurde durch Circulardichroismus‐Spektroskopie und thermogravimetrische Analyse (TGA) untersucht. Die Ursache für die Unterschiede wird mittels Strukturstudien basierend auf SXRD‐Daten und DFT‐Rechnungen erklärt.