Hierarchical host-guest assemblies formed on dodecaborate-coated gold nanoparticles

Area of Science:

• Nanotechnology
• Supramolecular Chemistry
• Materials Science

Background:

• Gold nanoparticles (AuNPs) are synthesized using undecahydro-mercapto-closo-dodecaborate (BSH) as a stabilizing ligand.
• BSH is an inorganic cluster anion offering unique properties for nanoparticle stabilization.

Purpose of the Study:

• To utilize BSH-capped AuNPs as nano-scaffolds for constructing supramolecular architectures.
• To investigate the assembly of amphiphilic calixarene (CX) on BSH-AuNP surfaces.
• To develop a chemosensing ensemble for detecting negatively charged molecules.

Main Methods:

• Preparation of BSH-capped gold nanoparticles (AuNPs).
• Assembly of amphiphilic calixarene (CX) on BSH-AuNP surfaces to form mono- and bi-layer structures.
• Utilizing host-guest complexation for supramolecular architecture formation.
• Employing host-dye displacement assays for chemosensing applications.

Main Results:

• BSH-capped AuNPs successfully formed nano-scaffolds for supramolecular assembly.
• Amphiphilic calixarene formed distinct mono- and bi-layer assemblies on AuNP surfaces.
• The inorganic-organic hybrid materials demonstrated effective chemosensing capabilities.
• Detection of negatively charged molecules, including DNA, was achieved.

Conclusions:

• BSH is an effective ligand for preparing functionalized AuNPs.
• Supramolecular architectures can be controllably assembled on BSH-AuNP nano-scaffolds.
• The developed hybrid materials offer a promising platform for sensitive chemosensing of anionic species.