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Reference type: Journal
Authors: Paik P, Gedanken A, Mastai Y
Article Title: Enantioselective Separation Using Chiral Mesoporous Spherical Silica Prepared by Templating of Chiral Block Copolymers.
Publication date: 2009
Journal: ACS Applied Materials & Interfaces
Volume: 1
Issue: (8)
Page numbers: 1834-1842.
DOI: 10.1021/am9003842

Abstract: In this work, we synthesized chiral mesoporous silica (CMS) spheres, which can be used as a potential candidate for chiral separation. The CMS spheres with controllable pore sizes (of 2G3 nm) and high surface areas of ca. 614 m2 g-1 were synthesized by chiral templating with chiral block copolymers based on poly(ethylene oxide) and dl-glutamic acid [PEO113-b-(GluA)10]. The ordered structure of the chiral mesopores was characterized by high-resolution transmission electron microscopy, and the average pore diameters of chiral mesopores were estimated from the nitrogen adsorption-desorption measurements. The enantioselectivity properties and chiral resolution kinetics of the mesopores of silica spheres, after extraction of chiral polymers of PEO113-b-(l/d-GluA)10, were scrutinized using a racemic solution of valine and measuring the circular dichroism and optical polarimetery. A chiral selectivity factor of 5.22 was found with a specific enantiomer of valine adsorbed preferably. These results raise the new possibilities of CMS spheres for enantiomeric separation and other enantioselective applications
Template and target information: chiral block copolymers


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