Abstract
We describe, for the first time, a successful strategy for synthesizing chiral periodic mesoporous organosilica nanoparticles (PMO NPs). The chiral PMO nanoparticles were synthesized in a sol–gel process under mild conditions; their preparation was mediated by hydrolysis and condensation of chiral-bridged organo-alkoxysilane precursor compounds, (OR‘)3Si-R-Si(OR‘)3, in the presence of cetyltrimethylammonium bromide (CTAB) surfactant. The resulting nanoparticles were composed merely from a chiral- bridged organo-alkoxysilane monomer. These systems were prepared by applying different surfactants and ligands that finally afforded monodispersed chiral PMO NPs consisting of 100% bridged-organosilane precursor. In addition, the major advancement that was achieved here was, for the first time, success in preparing magnetic chiral PMO NPs. These nanoparticles were synthesized by the co-polymerization of 1,1′-((1R,2R)-1,2-diphenylethane-1,2-diyl)bis(3-(3-(triethoxysilyl) propyl) urea) chiral monomer by an oil in water (o/w) emulsion process, to afford magnetic chiral PMO NPs with magnetite NPs in their cores. The obtained materials were characterized with high-resolution scanning electron microscopy (HR-SEM), high-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray (EDX) spectroscopy, powder X-ray diffraction (XRD), solid-state NMR analysis, circular dichroism (CD) analysis, and nitrogen sorption analysis (N2-BET).
Highlights
Chirality is a fundamental research topic and of vital importance for various fields in natural sciences
The obtained materials were characterized with high-resolution scanning electron microscopy (HR-Scanning electron microscopy (SEM)), high-resolution transmission electron microscopy (HR-Transmission electron microscopy (TEM)), energy-dispersive X-ray (EDX) spectroscopy, powder X-ray diffraction (XRD), solid-state NMR analysis, circular dichroism (CD) analysis, and nitrogen sorption analysis (N2 -BET)
Increasing attention has been paid to the construction of chiral solid materials and chiral surfaces due to their potential to be applied in chiral adsorption, enantioseparations and catalysis [4–13]
Summary
Chirality is a fundamental research topic and of vital importance for various fields in natural sciences. Chiral biomolecules have been recognized as the basis of life on earth and many phenomena in nature could be explained through the concepts of stereoisomerism and chirality. The major efforts have been devoted to developing methods for creation and isolation of chiral organic molecules because of their significance in numerous applications [1–3]. Several methods have been developed for the fabrication of chiral silica in different morphologies [14–30]. These methods include the utilization of chiral surfactants or polymers as template, the condensation of silane monomers containing chiral organic groups and the grafting of chiral groups on the walls of mesoporous silica materials
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
