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Gold Nanoparticles Modification with Liquid Crystalline Polybenzylic Dendrons via 1,3-Dipolar Cycloaddition
José Antonio Ulloa1, Joaquín Barberá2, José Luis Serrano2
1Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Casilla 160-C, Calle Edmundo Larenas 129, Concepción 4070371, Chile.
Nanomaterials (Basel, Switzerland)
|November 26, 2022
Summary
This study synthesized polybenzylic dendrons and attached them to gold nanoparticles using click chemistry. The resulting dendron-coated nanoparticles exhibited unique solid-phase interactions and optical properties, influenced by dendron structure and thermal treatment.
Area of Science:
- Materials Science
- Nanotechnology
- Supramolecular Chemistry
Background:
- Polybenzylic dendrons with alkynyl focal points were synthesized.
- Five dendrons exhibited columnar mesomorphism over a broad temperature range.
- Gold nanoparticles were stabilized with dodecanethiol and 11-azidoundecane-1-thiol.
Purpose of the Study:
- To functionalize gold nanoparticles with polybenzylic dendrons.
- To investigate the properties of dendron-coated gold nanoparticles.
- To explore the effect of thermal treatment on these nanomaterials.
Main Methods:
- Synthesis of polybenzylic dendrons.
- Functionalization of gold nanoparticles via 1,3-dipolar cycloaddition (click chemistry).
- Characterization using TEM, DSC, TGA, NMR, and UV-Vis spectroscopy.
Main Results:
- Efficient cycloaddition (47-69%) achieved without nanoparticle aggregation.
- Dendron-coated nanoparticles showed a melting transition but no liquid crystal properties.
- Short-range interactions and a 2D local hexagonal order observed in the solid phase.
- Near-field effects due to surface plasmon resonance coupling were detected.
Conclusions:
- Gold nanoparticles coated with columnar mesogen dendrons were successfully prepared.
- Thermal treatment influences nanoparticle growth based on dendron size, shape, and temperature.
- The study highlights novel interactions and optical phenomena in these unique nanomaterials.
