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|Title:||Enantioselective adsorption and diffusion of S-/R-glycidol in homochiral zeolites: A molecular simulation study|
|Authors:||Zhang, L. |
|Citation:||Zhang, L., Jiang, J. (2011-02-01). Enantioselective adsorption and diffusion of S-/R-glycidol in homochiral zeolites: A molecular simulation study. Journal of Membrane Science 367 (1-2) : 63-70. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2010.10.038|
|Abstract:||As the first example of enantiopure homochiral zeolites, silicogermanates SU-32 can be synthesized in right- (SU-32a) or left-handed (SU-32b). These rare chiral zeolites provide beautiful benchmark structures to examine the microscopic properties of chiral molecules in the helical channels with only a single handedness. We report a molecular simulation study to investigate the enantioselective adsorption and diffusion of S-/R-glycidol enantiomers in SU-32a and SU-32b. S-glycidol is found to interact with SU-32a more strongly than R-glycidol and preferentially adsorbed in SU-32a, and the opposite is observed in SU-32b. The enantiomeric excess of S-/R-glycidol racemic mixture in SU-32a and SU-32b is up to 25% and slightly decreases with increasing temperature. For pure enantiomers, S-glycidol diffuses faster in SU-32a and slower in SU-32b, whereas the reverse is true for R-glycidol. The free energy analysis suggests that S-glycidol encounters a lower barrier to diffuse in SU-32a but a higher one in SU-32b. For S-/R-glycidol racemic mixture, the diffusion difference between two enantiomers becomes negligible as loading increases. This study reveals that enantiopure SU-32a and SU-32b have distinct enantioselectivity for glycidol enantiomers, particularly the selective adsorption, and might be useful for chiral separation. © 2010 Elsevier B.V.|
|Source Title:||Journal of Membrane Science|
|Appears in Collections:||Staff Publications|
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