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L - and D-proline adsorption by chiral ordered mesoporous silica

AuthorsCasado, Clara; Gracia, Ismael; Mayoral, Álvaro; López-Ram-de-Víu, Pilar ; Coronas, Joaquín
Issue Date2012
PublisherAmerican Chemical Society
CitationLangmuir 28(16): 6638-6644 (2012)
AbstractChiral ordered mesoporous silica (COMS) was synthesized in the presence of amino acid proline by combining tetraethyl orthosilicate and quaternized aminosilane silica sources. The as-prepared materials were activated by calcination or microwave chemical extraction to remove the organic templates. The powder X-ray diffraction and N 2 adsorption characterization revealed in COMS the structural and textural features of MCM-41-type silica. The chirality of the material was disclosed by mixed and separate l- and d-proline adsorption on the COMS prepared with l-proline (l-Pro-COMS) and d-proline (d-Pro-COMS). It was found that the maximum l-proline and d-proline adsorption capacities on l-Pro-COMS were ca. 2.3 and 0.6 mmol/g, respectively, while the adsorption of d-proline was higher than that of l-proline on d-Pro-COMS. Finally, both activation routes yielded enantioselective silicas able to separate proline racemate. © 2012 American Chemical Society.
Identifiersdoi: 10.1021/la300864n
issn: 0743-7463
e-issn: 1520-5827
Appears in Collections:(ISQCH) Artículos
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