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Chiral Gold Nanocluster Demystified

Photonics.com
Jun 2010
JYVÄSKYLÄ, Finland, June 1, 2010 — After 10 years, the mystery of the structural, electronic and optical properties of a chiral gold nanocluster has finally been resolved. 

Researchers at the department of chemistry and Nanoscience Center (NSC) of the University of Jyväskylä, including Dr. Olga Lopez-Acevedo and professor Hannu Häkkinen, confirmed the theoretical structure via comparison to experimental results obtained by x-ray diffraction from powder samples of the pure cluster material. The theoretical work was done in collaboration with researchers at Kansas State University and the experimental part at Hokkaido University.

The synthesis of organothiolate-protected gold clusters of 1 to 3 nm in size has been well-known since the mid-1990s, but the detailed atomic structure of the most stable clusters remained a mystery until very recently. In 2007, the structure of the first cluster that contained 102 gold atoms was resolved at Stanford University using single-crystal x-ray crystallography. The cluster now resolved has exactly 38 gold atoms and 24 organothiolate molecules covering its surface, and it is just about 1 nm (nanometer = one millionth of a millimeter) in size.

The shape of the particle is prolate (cigarlike), and 15 out of its 38 gold atoms reside on the protective surface layer chemically bound with the thiolate molecules. The gold-thiolate layer has a chiral structure that is responsible for the observed chiral properties. The chiral structure has two structural forms (enantiomers), the so-called right-handed and left-handed forms, in a way comparable to a twist in a DNA molecule or to a twist in the staircase structure of a block of flats.

Chirality is a very common structural property of molecules in nature. The chiral nature of gold clusters influences the way they respond to circularly polarized light. This effect was first reported in experiments by professor Robert L. Whetten's team at Georgia Institute of Technology (Atlanta, USA) exactly 10 years ago.

"We observed that particularly the 38-atom cluster (for which no structural information was available) is very sensitive for the polarization of light, and the now-resolved structure finally explains our observations," said Whetten.

In the future, chiral gold nanoclusters could be used as biocompatible, enantioselective sensors, drug carriers or catalysts.

The team is supported by the Academy of Finland and the CSC – the IT Center for Science and has collaborated with researchers at Stanford University, Georgia Institute of Technology, Kansas State University, the University of North Carolina, Chalmers University of Technology and Hokkaido University.

The study was published in the Journal of the American Chemical Society.

For more information, visit:  www.jyu.fi/en/ 




GLOSSARY
x-ray crystallography
The study of the arrangement of atoms in a crystal by means of x-rays.
x-ray diffraction
The bending of x-rays by the regular layers of molecules in a crystal acting like a very small diffraction grating. The diffraction pattern so obtained and recorded on film provides a means for analyzing the crystal structure.  
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