title: L- and D-proline adsorption by chiral ordered mesoporous silica.
abstract: Chiral 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 N2 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.
authors.affiliation: Department of Chemical and Environmental Engineering and Instituto de Nanociencia de Aragón (INA), ‡Department of Organic Chemistry, and §Laboratorio de Microscopías Avanzadas, INA, Universidad de Zaragoza , 50018 Zaragoza, Spain.
authors.forename: Clara
authors.initials: C
authors.lastname: Casado
authors.forename: Joaquín
authors.initials: J
authors.lastname: Castán
authors.forename: Ismael
authors.initials: I
authors.lastname: Gracia
authors.forename: Miriam
authors.initials: M
authors.lastname: Yus
authors.forename: Alvaro
authors.initials: A
authors.lastname: Mayoral
authors.forename: Víctor
authors.initials: V
authors.lastname: Sebastián
authors.forename: Pilar
authors.initials: P
authors.lastname: López-Ram-de-Viu
authors.forename: Santiago
authors.initials: S
authors.lastname: Uriel
authors.forename: Joaquín
authors.initials: J
authors.lastname: Coronas
mesh_terms: D000327:Adsorption; D015394:Molecular Structure; D010316:Particle Size; D016062:Porosity; D011392:Proline / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013237:Stereoisomerism; D013499:Surface Properties
chemical_list: D012822:Silicon Dioxide; D011392:Proline