Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Phantom parent molecule of important class of chemical compounds isolated for first time

12.06.2008
A team of scientists from the University of Georgia and two European universities has, for the first time, synthesized and characterized the elusive parent molecule of an important class of chemical compounds.

The discovery, reported today in the journal Nature, involves trapping the carbene hydroxymethylene (HCOH) in a matrix of argon at 11 degrees Kelvin—just above absolute zero (¬?.67 degrees F)—where it was observed to decay, over a period of a few hours, to formaldehyde in a process that bears resemblance to the radioactive decay of nuclei.

While chemists had theorized for some years that HCOH should be isolable, this is the first time it has been achieved, and the accomplishment provides a greater understanding of the behavior of a class of compounds extremely important to organic and organometallic chemistry.

"It took a perfect match between experimental observations and theoretical predictions for us to say we have this molecule for the first time," said UGA chemist Wesley Allen, "but it worked beautifully, and this method can work for other elusive molecules as well."

... more about:
»HCOH »Quantum »UGA »compounds »decay »tunneling

Co-authors with Allen on the paper were Peter Schreiner and Hans Peter Reisenauer of Liebig University in Germany; Edit Mátyus and Attila Császár of Eötvös University in Hungary; and Frank Pickard and Andrew Simmonett, who along with Allen are with the department of chemistry at UGA. Schreiner received his doctoral degree from UGA and was on the faculty for several years before returning to Germany.

While the capture of HCOH is important, just as interesting is the team's unexpected discovery that the molecule decays to formaldehyde near absolute zero through "quantum tunneling," one of the more mystifying aspects of quantum theory. In quantum tunneling, a particle passes through a barrier that is impenetrable by normal standards.

"This kind of tunneling happens all the time with electrons, because they are so light," said Allen, "but for it to happen for heavier particles such as hydrogen atoms, the barriers must be more modest. In this case, the HCOH molecule tunnels under an enormous barrier, perhaps the most spectacular example of this process known in chemistry."

The reason why the group was studying HCOH at all began with a NASA project, since scientists at the space agency wanted to see if the elusive molecule existed in space but first needed to know what it would look like. Unfortunately, no one had been able to isolate and characterize it until the current research.

Allen and his UGA colleagues, who are theoretical chemists—studying chemistry by large-scale computations based on the laws of physics—say that it's now highly unlikely that free HCOH will be found in space.

"One of the most gratifying parts of this work is that we made the predictions of the tell-tale signatures of the molecule prior to the actual laboratory studies, which were done in Europe," said Allen, "so to us it helps prove the value of quantum chemistry in finding solutions in the lab."

While the signatures of HCOH were predicted, the quantum tunneling aspect came completely out of left field, Allen said, surprising everyone involved.

"Peter [Schreiner] called me up and said the decay mechanism was tunneling, because the molecule was perfectly stable when a heavy hydrogen isotope was inserted," said Allen. "I initially laughed at this idea. But I did the theory to see if it could be quantum tunneling, and sure enough we found out that it is what was happening in all likelihood. It was amazing."

Kim Osborne | EurekAlert!
Further information:
http://www.uga.edu

Further reports about: HCOH Quantum UGA compounds decay tunneling

More articles from Life Sciences:

nachricht Microscope measures muscle weakness
16.11.2018 | Friedrich-Alexander-Universität Erlangen-Nürnberg

nachricht Good preparation is half the digestion
16.11.2018 | Max-Planck-Institut für Stoffwechselforschung

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: UNH scientists help provide first-ever views of elusive energy explosion

Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.

Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

NASA keeps watch over space explosions

16.11.2018 | Physics and Astronomy

UNH scientists help provide first-ever views of elusive energy explosion

16.11.2018 | Physics and Astronomy

How the gut ‘talks’ to brown fat

16.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>