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Two helices from one chiral centre – self organization of disc shaped chiral nanoparticles

DOI: 10.1039/D0SC05100D DOI Help

Authors: Huanan Yu (University of Hull) , Wentao Qu (Xi'an Jiaotong University) , Feng Liu (Xi'an Jiaotong University) , Georg H. Mehl (University of Hull; Xi'an Jiaotong University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemical Science , VOL 8

State: Published (Approved)
Published: December 2020

Open Access Open Access

Abstract: Gold nanoparticles (AuNPs) have been prepared and surface-functionalized with a mixture of 1-hexanethiol co-ligands and chiral discogen ligands separated from a disulfide function via a flexible spacer. Polarized optical microscopy together with differential scanning calorimetry showed that the organic corona of the nanocomposite forms a stable chiral discotic nematic image file: d0sc05100d-t1.tif phase with a wide thermal range. Synchrotron X-ray diffraction showed that gold NPs form a superlattice with p2 plane symmetry. Analysis indicated that the organic corona takes up the shape of a flexible macrodisk. Synchrotron radiation-based circular dichroism signals of thin films are significantly enhanced on the isotropic-LC transition, in line with the formation of a chiral nematic phase of the organic corona. At lower temperatures the appearance of CD signals at longer wavelengths is associated with the chiral organisation of the NPs and is indicative of the formation of a second helical structure. The decreased volume required and the chiral environment of the disc ligands drives the nanoparticles into columns that arrange helically, parallel to the shortest axis of the two dimensional lattice.

Subject Areas: Materials, Chemistry

Instruments: B23-Circular Dichroism

Other Facilities: BL16B1 at Shanghai Synchrotron Radiation Facility

Added On: 28/01/2021 14:32


Discipline Tags:

Inorganic Chemistry Organic Chemistry Materials Science Nanoscience/Nanotechnology Chemistry

Technical Tags:

Spectroscopy Circular Dichroism (CD)