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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 |
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| Authors: | Tianxiang Chen Bolong Huang Sarah Day Chiu Chung Tang Shik Chi Edman Tsang Kwok-yin Wong Tsz Woon Benedict Lo |
| Affiliation: | 1. State Key Laboratory of Chemical Biology and Drug Discovery, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China;2. Diamond Light Source Ltd, Didcot, OX11 0DE UK;3. Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford, OX1 3QR UK |
| 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. |
| Keywords: | Chiralität Circulardichroismus Materialwissenschaften Strukturaufklärung Röntgenbeugung |