Title
Self-Directing Chiral Information in Solid-Solid Transformation: Unusual Chiral-Transfer without Racemization from Amorphous Silica to Crystalline Silicon
Author
Xin-Ling Liu, Seiji Tsunega, Ren-Hua Jin
Year
2017
Journal
Nanoscale Horizons
Abstract
Constructing novel chiral inorganic nanomaterials is an emerging branch in chirality research. In this work, employingng a solid magnesiothermic reaction at 500-600 o C, we reduced chiral SiO2 nanofibers with average diameter ~10 nm into chiral Si nanoplates with size about several hundred nm. The chirality of the as-prepared Si was judged by the pair of signals with mirror relationship between 400-500 nm appearing on the solid-state diffuse reflectance circular dichroism (DRCD) spectra for the L- and D-form Si. Furthermore, it was confirmed by induced vibrational circular dichroism (VCD) signals corresponding to the absorption bands in the infrared range of achiral organics (polyvinylpyrrolidone K90 and trimethoxypenylsilane) absorbed onto chiral Si. The as-used SiO2 nanofibers possessed an ultra high-temperature (up to 900 o C) resistant chirality, which would be due to the asymmetric arrangement of Si and O atoms in small chiral domains (
Instrument
J-820
Keywords
Circular dichroism, Diffuse reflectance Stereochemistry, Nanostructures, Materials, Inorganic chemistry,