Featured Research

from universities, journals, and other organizations

Chemists Make New Chiral Palladium Metal

Date:
April 24, 2009
Source:
Universiteit van Amsterdam (UVA)
Summary:
Researchers in the Netherlands have succeeded in making the first ever piece of chiral palladium metal. The findings are significant because they lead to an entirely new class of materials. These are metallo-organics -- they combine the variety of organic molecules with the special properties of metals.

Researchers at the University of Amsterdam (UvA) have succeeded in making the first ever piece of chiral palladium metal. The findings, by a research team led by Gadi Rothenberg, professor of Heterogeneous Catalysis and Sustainable Chemistry at the UvA, are significant because they lead to an entirely new class of materials. These are metallo-organics - they combine the variety of organic molecules with the special properties of metals.

The research results are published this week in Nature Chemistry.

Chirality is a Greek term that means that an object, for example a molecule, has a mirror image, such as two hands. Chiral molecules have asymmetrical centres or right- or left-handed structures. Metals are not chiral because they have neither. However, in the UvA experiments, palladium metal could be made chiral by using organic template molecules which were then later removed.

These new materials, metallo-organics, are the opposite of organometallics. The possibilities of imprinting metals with organic molecules are practically endless, and the process itself is so simple that it can be used in high-school demonstration experiments.

Using simple precipitation technology, Prof. Rothenberg and Dr Laura Duran Pachon managed to imprint palladium metal crystals with a chiral organic template. The entire template was then removed, leaving a chiral cavity in the palladium metal. The metal itself retains all its usual properties, such as malleability, conductivity, and catalytic activity. Using a ten-tonne French press, the researchers even pressed a chiral palladium coin, roughly the size of a two-cent piece.

The chirality of the metal was proven in various experiments carried out in collaboration with the group of professor Ron Naaman at the Weizmann Institute of Science in Rehovot, Israel. Like all metals, palladium exhibits the photo-electric effect: when a high-energy photon hits the metal, an electron is ejected. However, PhD student Tal Markus in Rehovot showed that the palladium coin made in Amsterdam ejected different electrons when exposed to clockwise polarized or anticlockwise polarized photons, proving the metal’s chirality.

Another experiment demonstrated differences in absorption reactions in the two chiral metals. Together with PhD student Itzik Yosef and professor David Avnir of the Hebrew University of Jerusalem, the catalytic activity of the adapted metals was displayed.

The research was financed by a Vidi grant which Rothenberg received from the Netherlands Institute for Scientific Research (NWO) in 2003. This personal research grant is given to post-doctorate researchers for the development of original research projects.


Story Source:

The above story is based on materials provided by Universiteit van Amsterdam (UVA). Note: Materials may be edited for content and length.


Journal Reference:

  1. L. Durαn Pachσn, I. Yosef, T.Z. Markus, R. Naaman, D. Avnir, G. Rothenberg. Chiral imprinting of palladium with cinchona alkaloids. Nature Chemistry, 2009; DOI: 10.1038/nchem.180

Cite This Page:

Universiteit van Amsterdam (UVA). "Chemists Make New Chiral Palladium Metal." ScienceDaily. ScienceDaily, 24 April 2009. <www.sciencedaily.com/releases/2009/04/090422085528.htm>.
Universiteit van Amsterdam (UVA). (2009, April 24). Chemists Make New Chiral Palladium Metal. ScienceDaily. Retrieved August 23, 2014 from www.sciencedaily.com/releases/2009/04/090422085528.htm
Universiteit van Amsterdam (UVA). "Chemists Make New Chiral Palladium Metal." ScienceDaily. www.sciencedaily.com/releases/2009/04/090422085528.htm (accessed August 23, 2014).

Share This




More Matter & Energy News

Saturday, August 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Is It a Plane? No, It's a Hoverbike

Is It a Plane? No, It's a Hoverbike

Reuters - Business Video Online (Aug. 22, 2014) — UK-based Malloy Aeronautics is preparing to test a manned quadcopter capable of out-manouvering a helicopter and presenting a new paradigm for aerial vehicles. A 1/3-sized scale model is already gaining popularity with drone enthusiasts around the world, with the full-sized manned model expected to take flight in the near future. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Coal Gas Boom in China Holds Climate Risks

Coal Gas Boom in China Holds Climate Risks

AP (Aug. 22, 2014) — China's energy revolution could do more harm than good for the environment, despite the country's commitment to reducing pollution and curbing its carbon emissions. (Aug. 22) Video provided by AP
Powered by NewsLook.com
Former TSA X-Ray Scanners Easily Tricked To Miss Weapons

Former TSA X-Ray Scanners Easily Tricked To Miss Weapons

Newsy (Aug. 21, 2014) — Researchers found the scanners could be duped simply by placing a weapon off to the side of the body or encasing it under a plastic shield. Video provided by Newsy
Powered by NewsLook.com
Flower Power! Dandelions Make Car Tires?

Flower Power! Dandelions Make Car Tires?

Reuters - Business Video Online (Aug. 20, 2014) — Forget rolling on rubber, could car drivers soon be traveling on tires made from dandelions? Teams of scientists are racing to breed a type of the yellow flower whose taproot has a milky fluid with tire-grade rubber particles in it. As Joanna Partridge reports, global tire makers are investing millions in research into a new tire source. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins