Related Experiment Video
Updated: Jun 6, 2026
10:38
Synthesis of Functionalized 10-nm Polymer-coated Gold Particles for Endothelium Targeting and Drug Delivery
Published on: January 15, 2018
Tiopronin gold nanoparticle precursor forms aurophilic ring tetramer
Carrie A Simpson1, Christopher L Farrow, Peng Tian
1Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235-1822, United States.
Inorganic Chemistry
|November 12, 2010
Summary
Researchers characterized a novel gold(I) tiopronin tetramer intermediate in nanoparticle synthesis. This gold complex exhibits aurophilicity and retains key properties in the final monolayer-protected clusters (MPCs).
Area of Science:
- Inorganic Chemistry
- Materials Science
- Nanotechnology
Background:
- Thiolate-monolayer protected clusters (MPCs) are synthesized in a two-step process.
- The initial step involves mild reduction of gold(III) by thiols, forming gold(I) thiolate intermediates.
Purpose of the Study:
- To characterize the intermediate Au(4)Tio(4) complex formed using tiopronin (Tio) as a thiol reductant.
- To elucidate the structure of gold(I)-thiolate complexes when crystallographic data is challenging to obtain.
Main Methods:
- Utilized Nuclear Magnetic Resonance (NMR), elemental analysis, thermogravimetric analysis (TGA), and matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS).
- Employed powder diffraction and pair distribution functions (PDF) for structural analysis.
- Integrated novel characterization techniques with standard analytical methods.
Main Results:
- Characterization confirmed a cyclic gold(I)-thiol tetramer structure for the Au(4)Tio(4) complex.
- Evidence of aurophilicity was observed through luminescent properties and a distinct Au-Au intramolecular distance.
- Key structural and aurophilic features were retained in the final MPCs after borohydride reduction.
Conclusions:
- A combination of analytical techniques, particularly mass spectrometry, can determine structure in the absence of crystallographic data.
- The intermediate gold(I) tiopronin complex exhibits significant aurophilicity and unique structural characteristics.
- The study provides insights into the formation and properties of gold-thiolate intermediates relevant to MPC synthesis.
