Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Secrets of a chiral gold nanocluster unveiled

Abstract:
Researchers at the Department of Chemistry and Nanoscience Center (NSC) of the University of Jyväskylä (Dr Olga Lopez-Acevedo and Professor Hannu Häkkinen) have resolved the structural, electronic and optical properties of a chiral gold nanocluster that remained a mystery for ten years. The theoretical structure was confirmed 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 team is supported by the Academy of Finland and the CSC - the IT Center for Science.

Secrets of a chiral gold nanocluster unveiled

Finland | Posted on May 27th, 2010

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 one nanometer (nanometer = one millionth of a millimeter) in size. The shape of the particle is prolate (cigar-like), and 15 out if its 38 gold atoms reside on the protective surface layer chemically bound with the thiolate molecules. The gold-thiolate layer has a chiral structure, which 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 polarised light. This effect was first reported in experiments by Professor Robert L. Whetten's team at Georgia Institute of Technology (Atlanta, USA) exactly ten years ago. "We observed that particularly the 38-atom cluster (for which no structural information was available) is very sensitive for the polarisation of light, and the now-resolved structure finally explains our observations," comments Professor Whetten. In the future, chiral gold nanoclusters could be used as bio-compatible, enantioselective sensors, drug carriers or catalysts.

Professor Häkkinen's team at the University of Jyväskylä has played a world-leading role in theoretical structural determination and characterisation of thiolate-protected gold nanoclusters over the last few years. The team 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.

For more information please contact Professor Hannu Häkkinen, email tel. +358 (0)14 260 4719


The study was published in the Journal of the American Chemical Society, May 25, 2010. The link to the article "Chirality and electronic structure of the thiolate-protected Au38 nanocluster", O. Lopez-Acevedo, H. Tsunoyama, T. Tsukuda, H. Häkkinen, C.M. Aikens, JACS ASAP article May 25, 2010. pubs.acs.org/doi/abs/10.1021/ja102934q

####

For more information, please click here

Contacts:
Professor Hannu Häkkinen

tel. +358 (0)14 260 4719

Academy of Finland Communications
Communications Specialist Leena Vähäkylä
tel. (09) 7748 8327
040 359 2936

Copyright © Academy of Finland

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Heating quantum matter: A novel view on topology: Physicists demonstrate how heating up a quantum system can be used as a universal probe for exotic states of matter August 22nd, 2017

A Tougher Tooth: A new dental restoration composite developed by UCSB scientists proves more durable than the conventional material August 22nd, 2017

Nagoya physicists resolve long-standing mystery of structure-less transition: Nagoya University-led team of physicists use a synchrotron radiation X-ray source to probe a so-called 'structure-less' transition and develop a new understanding of molecular conductors August 21st, 2017

Tokai University research: Nanomaterial wrap for improved tissue imaging August 21st, 2017

Chemistry

Two Scientists Receive Grants to Develop New Materials: Chad Mirkin and Monica Olvera de la Cruz recognized by Sherman Fairchild Foundation August 16th, 2017

2-faced 2-D material is a first at Rice: Rice University materials scientists create flat sandwich of sulfur, molybdenum and selenium August 14th, 2017

Clarifiying complex chemical processes with quantum computers August 3rd, 2017

Strem Chemicals Surpasses ChemStewards® Requirements: Strem Qualifies for SOCMA’s “Excellence” Ranking August 3rd, 2017

Possible Futures

Heating quantum matter: A novel view on topology: Physicists demonstrate how heating up a quantum system can be used as a universal probe for exotic states of matter August 22nd, 2017

A Tougher Tooth: A new dental restoration composite developed by UCSB scientists proves more durable than the conventional material August 22nd, 2017

Nagoya physicists resolve long-standing mystery of structure-less transition: Nagoya University-led team of physicists use a synchrotron radiation X-ray source to probe a so-called 'structure-less' transition and develop a new understanding of molecular conductors August 21st, 2017

Tokai University research: Nanomaterial wrap for improved tissue imaging August 21st, 2017

Academic/Education

Two Scientists Receive Grants to Develop New Materials: Chad Mirkin and Monica Olvera de la Cruz recognized by Sherman Fairchild Foundation August 16th, 2017

Moving at the Speed of Light: University of Arizona selected for high-impact, industrial demonstration of new integrated photonic cryogenic datalink for focal plane arrays: Program is major milestone for AIM Photonics August 10th, 2017

Graduate Students from Across the Country Attend Hands-on NanoCamp: Prominent scientists Warren Oliver, Ph.D., and George Pharr, Ph.D., presented a weeklong NanoCamp for hand-picked graduate students across the United States July 26th, 2017

The Physics Department of Imperial College, London, uses the Quorum Q150T to deposit metals and ITO to make plasmonic sensors and electric contact pads July 13th, 2017

Nanomedicine

Tokai University research: Nanomaterial wrap for improved tissue imaging August 21st, 2017

Gold nanostars and immunotherapy vaccinate mice against cancer: New treatment cures, vaccinates mouse in small proof-of-concept study August 18th, 2017

Freeze-dried foam soaks up carbon dioxide: Rice University scientists lead effort to make novel 3-D material August 16th, 2017

Gold shines through properties of nano biosensors: Researchers discover that fluorescence in ligand-protected gold nanoclusters is an intrinsic property of the gold particles themselves August 16th, 2017

Announcements

Heating quantum matter: A novel view on topology: Physicists demonstrate how heating up a quantum system can be used as a universal probe for exotic states of matter August 22nd, 2017

A Tougher Tooth: A new dental restoration composite developed by UCSB scientists proves more durable than the conventional material August 22nd, 2017

Nagoya physicists resolve long-standing mystery of structure-less transition: Nagoya University-led team of physicists use a synchrotron radiation X-ray source to probe a so-called 'structure-less' transition and develop a new understanding of molecular conductors August 21st, 2017

Tokai University research: Nanomaterial wrap for improved tissue imaging August 21st, 2017

Nanobiotechnology

Tokai University research: Nanomaterial wrap for improved tissue imaging August 21st, 2017

Gold nanostars and immunotherapy vaccinate mice against cancer: New treatment cures, vaccinates mouse in small proof-of-concept study August 18th, 2017

Freeze-dried foam soaks up carbon dioxide: Rice University scientists lead effort to make novel 3-D material August 16th, 2017

Gold shines through properties of nano biosensors: Researchers discover that fluorescence in ligand-protected gold nanoclusters is an intrinsic property of the gold particles themselves August 16th, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project