Journal
NANO LETTERS
Volume 16, Issue 10, Pages 6411-6415Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b02858
Keywords
Chiral nanostructures; chiral transcription; origin of inorganic chirality; chiral enhancement; VCD
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Funding
- Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation from Japan Society for the Promotion of Science
- JST in Japan
- ANR in France
- Centre National de la Recherche Scientifique
- Bordeaux University
- Grants-in-Aid for Scientific Research [15J11530] Funding Source: KAKEN
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Synthesis of chiral inorganic or hybrid nanomaterials through sol-gel transcription of chiral organic templates has attracted a great deal of interest for more than a decade. However, the chiral nature of these inorganic matrices has never been directly observed. For the first time, we report a direct evaluation of chirality on noncrystalline silica chiral nanoribbons by vibrational circular dichroism (VCD) measurements. Strong Cotton effect around 1150-1000 cm-1 from Si-O-Si asymmetric stretching vibration was observed. Surprisingly, calcination of these hybrid nanoribbons doubled the intensity of Cotton effects. On the basis of transmission electron microscopy observations, IR, VCD, NMR, and Raman spectroscopies, we demonstrate that the silica chirality originates from twisted siloxane network composed of chiral arrangement of the Si-O-Si bonds. Our findings clearly prove the presence of chiral organization of amorphous silica network, making them very promising chiral platforms for chiral recognition, optical applications, or asymmetric catalysis.
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