Linear Tetraphenylmethane-Based Thioether Oligomers Stabilising an Entire Gold Nanoparticle by Enwrapping

The design and synthesis of a novel linear thioether‐based ligand subunit with a tetraphenylmethane core used in the stabilisation of gold nanoparticles (AuNPs) are presented. Mono‐, tri, penta‐ and heptamers of the ligand have been synthesised and used to stabilise AuNPs by enwrapping. With the exc...

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Bibliographic Details
Published in:Chemistry : a European journal 2016-02, Vol.22 (7), p.2261-2265
Main Authors: Lehmann, Mario, Peters, Erich Henrik, Mayor, Marcel
Format: Article
Language:English
Subjects:
Atomic properties
Chemistry
Correlation analysis
Gold
hybrid materials
ligand design
Ligands
Monomers
Nanoparticles
Oligomers
Organic solvents
Solvents
Sulfur
tetraphenylmethane
Thermal stability
Thermogravimetric analysis
Transmission electron microscopy
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Summary:The design and synthesis of a novel linear thioether‐based ligand subunit with a tetraphenylmethane core used in the stabilisation of gold nanoparticles (AuNPs) are presented. Mono‐, tri, penta‐ and heptamers of the ligand have been synthesised and used to stabilise AuNPs by enwrapping. With the exception of the monomer, all ligands provide reliable long‐term stability and redispersibility for the coated nanoparticles in common organic solvents. Despite variation of the oligomer length, all stable particles were of the same size within error tolerance (1.16±0.32 nm for the trimer, 1.15±0.30 nm for the pentamer, 1.17±0.34 nm for the heptamer), as investigated by transmission electron microscopy (TEM). These findings suggest that not only the number of sulfur atoms in the ligand, but also its bulkiness play a crucial role in stabilising the AuNPs. These findings are supported by thermogravimetric analysis (TGA), showing that AuNPs stabilised by the penta‐ or heptamer are passivated by a single ligand. Thermal stability measurements suggest a correlation between ligand coverage and thermal stability, further supporting these findings. Wrapper's delight: Mono‐, tri, penta‐, and heptamers of a linear thioether‐based ligand subunit with a tetraphenylmethane core have been synthesised and successfully used to stabilise gold nanoparticles (AuNPs) by enwrapping. With the exception of the monomer, all ligands provide reliable long‐term stability and redispersibility of the coated nanoparticles in common organic solvents.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201504575