Navigation Links
Golden nanocrown
Date:5/14/2008

This release is available in German.

Chinese researchers have recently made a golden crown with a diameter of only a few nanometers. It is a large ring-shaped molecule containing 36 gold atoms. The lords of the ring, a team of researchers from the Universities of Beijing, Hong Kong, and Nanjing report their unusual compound in the journal Angewandte Chemie: the molecular ring structure is held together exclusively by goldgold bonds and is thus the largest ring system made of gold atoms produced to date.

Large molecular rings have fascinated chemists for over 40 yearsever since the discovery of crown ethers in 1967. The pioneers in this area, C. J. Pederson, J.-M. Lehn, and D. J. Cram received the Nobel Prize in Chemistry for their discovery in 1987. In the meantime, large molecular ring systems have played an important role in the search for new functional materials and in nanotechnology. The synthesis of ring systems held together exclusively by metalmetal bonds has remained a challenge.

Small rings made of positively charged gold atoms have been know for some time, but only recently could the Chinese team make a ring containing 16 gold atoms. Now, the researchers, led by Shu-Yan Yu, Yi-Zhi Li, and Vivian Wing-Wah Yam, have introduced a new representative of this class of compounds, the biggest gold ring to date that is held together by means of goldgold bonds: a ring system containing 36 univalent gold atoms.

The researchers started their synthesis with a ring system containing six gold atoms. Three of the gold atoms are linked into a triangle. Each of these gold atoms is attached to another gold atom that sticks out from the corner of the triangle. Three organic ligands are then bound to this flat double triangle to form a molecule that resembles a three-blade propeller.

Six such propellers can be linked into a larger ring by means of a self-assembly process. Within this ring system, the gold atoms are arranged into a shape that resembles a crown: six double triangles are each bound to each other by two corners. The free double-corners point outward in a pattern that alternates above and below the plane of the ring.


'/>"/>

Contact: Shu-Yan Yu
yusy@chem.ruc.edu.cn
Wiley-Blackwell
Source:Eurekalert  

Related biology technology :

1. Emmy(R)- and Golden Globe(R)-Nominated Actress Marcia Cross to Join Lifetime Networks and Members of Congress From Both Parties at Capitol Hill Press Conference
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Golden nanocrown
(Date:3/24/2017)... On Thursday, March 23, 2017, ... down 0.07%; the Dow Jones Industrial Average edged 0.02% ... closed at 2,345.96, marginally dropping 0.11%. US markets saw ... 4 sectors finished in red, and 1 sector ended ... reports coverage on the following Biotechnology equities: BioDelivery Sciences ...
(Date:3/23/2017)... ... ... is proud to announce it has become the premiere team-building cooking event company in San ... world, such as Illumina, HP and Qualcomm, and is ranked #1 in its category on ... to its new team building format, a way for teams to not only interact with ...
(Date:3/23/2017)...  GlobeImmune, Inc. today announced it has entered into ... shares of its common stock to NantCell, Inc., a ... the sale of its common stock, NantCell has agreed ... GlobeImmune 200,000 shares, an estimated $2.0 million in value, ... pleased to enter into this strategic agreement with NantCell," ...
(Date:3/23/2017)... , March 23, 2017 NetworkNewsWire Editorial ... ... putting significant strain on health care systems, in terms of ... rises, so too does the development of innovative and efficient ... effects. Among the many types of cancer treatments, a growing ...
Breaking Biology Technology:
(Date:3/7/2017)... 2017 Brandwatch , the leading social intelligence company, ... Trust to uncover insights to support its reporting, help direct ... The UK,s leading youth charity will be using Brandwatch Analytics social ... a better understanding of the topics and issues that are a ... ...
(Date:3/2/2017)... 2, 2017 Summary This report ... Merck KGaA and its partnering interests and activities since ... Description The Partnering Deals and Alliance since 2010 ... of one of the world,s leading life sciences companies. ... purchase to ensure inclusion of the most up to ...
(Date:2/28/2017)...   Acuant , a leading provider of data ... to new and core technologies building upon the acquisition ... and desktop Acuant FRM TM facial recognition and ... time manual review of identity documents by accredited professionals. ... and most accurate capture software to streamline workflows by ...
Breaking Biology News(10 mins):