Chirality transfer from organic ligands to silver nanostructures via chiral polarisation of the electric field

Water-soluble ligand protected optically active silver nanostructures were synthesised in a one-step reduction and capping process mediated by thiol-containing biomolecules. The synthesis was performed successfully with d- and l-cysteine and l-glutathione. The chiroptical properties of the obtained...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2018, Vol.20 (31), p.20347-20351
Main Authors: Jakob, Matthias, von Weber, Alexander, Kartouzian, Aras, Heiz, Ulrich
Format: Article
Language:English
Subjects:
Biomolecules
Capping
Chirality
Cysteine
Dichroism
Electric fields
Energy transmission
Glutathione
Ligands
Nanostructure
Optical activity
Polarization
Reduction
Spectrum analysis
Transmission electron microscopy
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Summary:Water-soluble ligand protected optically active silver nanostructures were synthesised in a one-step reduction and capping process mediated by thiol-containing biomolecules. The synthesis was performed successfully with d- and l-cysteine and l-glutathione. The chiroptical properties of the obtained nanostructures were investigated by circular dichroism spectroscopy in the ultraviolet and visible wavelength range. They exhibit a g-value of up to 0.7%, which is about one order of magnitude larger compared to particles prepared by citrate reduction followed by a ligand exchange reaction. The structure and composition of the prepared materials were characterised by transmission electron microscopy, energy-dispersive X-ray and X-ray photoelectron spectroscopy. Although these structures do not have a chiral geometry, they show mirror image g-values when capped with d- and l-cysteine. This indicates that the underlying chirality transfer mechanism is based on an electric field polarisation process.
ISSN:1463-9076
1463-9084
DOI:10.1039/c8cp02970a