Differential Adsorption of l- and d-Lysine on Achiral MFI Zeolites as Determined by Synchrotron X-Ray Powder Diffraction and Thermogravimetric Analysis

Tianxiang Chen, Bolong Huang, Sarah Day, Chiu Chung Tang, Shik Chi Edman Tsang, Kwok yin Wong, Tsz Woon Benedict Lo (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1093-1097
Number of pages5
JournalAngewandte Chemie - International Edition
Volume59
Issue number3
DOIs
Publication statusPublished - 13 Jan 2020

Keywords

  • chirality
  • circular dichroism
  • materials science
  • structure elucidation
  • X-ray diffraction

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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