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:5/26/2016)... , ... May 26, 2016 , ... ... by Medistem Panama Inc. at the City of Knowledge in Panama, ... mesenchymal stem cells in the US earlier this year following FDA approval of ...
(Date:5/25/2016)... Oregon (PRWEB) , ... May 25, 2016 , ... ... Set features a variety of fracture-specific plating options designed to address fractures of ... industry-leading fracture fixation solutions. , The Acumed Ankle Plating System 3 is composed ...
(Date:5/25/2016)... ... 2016 , ... Lady had been battling arthritis since the age of two ... knee. Lady’s owner Hannah sought the help of Dr Jeff Christiansen of Superior ... cruciate ligament and help with the pain of Lady’s arthritis. Dr Christiansen suggested that ...
(Date:5/24/2016)... ... May 24, 2016 , ... Media Cybernetics, global image analysis ... corporate branding reflects a results-driven revitalization for a company with a renewed focus ... include a crisp, refreshed logo and a new web presence. , “I believe ...
Breaking Biology Technology:
(Date:3/22/2016)... PUNE, India , March 22, 2016 ... new market research report "Electronic Sensors Market for ... Fingerprint, Proximity, & Others), Application (Communication & ... and Geography - Global Forecast to 2022", ... consumer industry is expected to reach USD ...
(Date:3/21/2016)... , March 22, 2016 ... recognition with passcodes for superior security   ... a leading provider of secure digital communications services, today ... biometric technology and offer enterprise customers, particularly those in ... facial recognition and voice authentication within a mobile app, ...
(Date:3/17/2016)... , March 17, 2016 ABI Research, ... forecasts the global biometrics market will reach more ... 118% increase from 2015. Consumer electronics, particularly smartphones, ... fingerprint sensors anticipated to reach two billion shipments ... Dimitrios Pavlakis , Research Analyst at ABI ...
Breaking Biology News(10 mins):