TY - JOUR
T1 - Induction and detection of chirality in doped sol-gel materials
T2 - NMR and circular dichroism studies
AU - Fireman-Shoresh, Sharon
AU - Marx, Sharon
AU - Avnir, David
PY - 2007
Y1 - 2007
N2 - We have studied diastereomeric chiral interactions within sols, gels and xerogels of silicas and derivatized silicas (20% phenylated and 10% octadecylated silicas) doped with the chiral surfactant (-)-N-dodecyl-N- methylephedrinium bromide (DMB). Two spectral methods - new in the context of chiral sol-gel materials - have been used for that purpose. In the first method, we were able to detect the diastereomeric interactions between DMB and each of the pure enantiomers of co-doped 1,1′-binaphthyl-2,2′-diyl hydrogenphosphate using 31P-NMR spectroscopy. In the second method, we were able to obtain an induced circular dichroism (ICD) signal from the achiral dye Congo Red co-doped with DMB. NMR and ICD are complementary in understanding the way in which the chiral surfactant creates chiral environments inside the sol-gel materials. In particular, we provide ICD evidence that the silica network itself becomes chiral due to the entrapment of the chiral surfactant.
AB - We have studied diastereomeric chiral interactions within sols, gels and xerogels of silicas and derivatized silicas (20% phenylated and 10% octadecylated silicas) doped with the chiral surfactant (-)-N-dodecyl-N- methylephedrinium bromide (DMB). Two spectral methods - new in the context of chiral sol-gel materials - have been used for that purpose. In the first method, we were able to detect the diastereomeric interactions between DMB and each of the pure enantiomers of co-doped 1,1′-binaphthyl-2,2′-diyl hydrogenphosphate using 31P-NMR spectroscopy. In the second method, we were able to obtain an induced circular dichroism (ICD) signal from the achiral dye Congo Red co-doped with DMB. NMR and ICD are complementary in understanding the way in which the chiral surfactant creates chiral environments inside the sol-gel materials. In particular, we provide ICD evidence that the silica network itself becomes chiral due to the entrapment of the chiral surfactant.
UR - http://www.scopus.com/inward/record.url?scp=33846784901&partnerID=8YFLogxK
U2 - 10.1039/b612822j
DO - 10.1039/b612822j
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AN - SCOPUS:33846784901
SN - 0959-9428
VL - 17
SP - 536
EP - 544
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
IS - 6
ER -