Chemistry of Materials
ARTICLE
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ring, not present in the other three amino acids tested (arginine,
histidine, and isoleucine), would be responsible for that. Even
though conventional morphologies such as helices observed in
other analogous materials are not reported, some of the char-
acterizations carried out here (Raman spectroscopy, induced
circular dichroism (ICD), and TEM) are compatible with a
material singularly featured. Furthermore, ICD allows one to
conclude that Pro-COMS is a chiral inorganic material, where the
handedness of L-Pro-COMS is opposite to that of D-Pro-COMS,
as expected for a pair of enantiomers, while the spectrum of DL-
Pro-COMS shows no ICD signal. These observations together
with the resolution of several racemates confirm the chiral nature
of calcined L-Pro-COMS.
Even though arginine, histidine, isoleucine, and proline are
different in terms of side chain polarity and hydropathy index, all
of them give rise to ordered mesoporous silica. This suggests that
the experimental procedure used in this research is flexible
enough for probable application to most of the standard amino
acids and to other kinds of chiral organic compounds as chirality
inductors. This would open up new possibilities for multitude
of applications involving, among others, asymmetric catalysis and
enantiomeric separation.
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’ ASSOCIATED CONTENT
Supporting Information. Experimental data on 29Si
S
b
MAS NMR, TEM imaging, N2 adsorption/desorption iso-
therms, and Raman spectra. This material is available free of
(25) Davis, T. M.; Snyder, M. A.; Krohn, J. E.; Tsapatsis, M. Chem.
Mater. 2006, 18 (25), 5814–5816.
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’ AUTHOR INFORMATION
Corresponding Author
*E-mail: coronas@unizar.es.
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’ ACKNOWLEDGMENT
Financial support from the Spanish Ministry of Science and
Innovation (MAT2007-61028) is gratefully acknowledged. C.C.
also acknowledges a “Juan de la Cierva” grant from the Spanish
Science and Innovation Ministry. María Savirꢀon is thanked for
HPLC-MS analysis. In addition, the authors thank Prof. Avelino
Corma, Prof. Miguel Menꢀendez, Prof. Josꢀe Antonio Mayoral, Prof.
Michael Tsapatsis, and Prof. Fernando Rey for fruitful discussions.
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