In chemistry as in life, threesomes are not known to break up neatly.
And while open-minded thinkers have insisted that clean three-way splits do happen, nobody had actually witnessed one – until now.
A paper in the Aug. 8 issue of Science provides the first hard evidence for the simultaneous break-up of a molecule into three equal parts.
Previous studies of so-called "concerted break-ups" had only suggested their existence, said co-author Anna Krylov, a theoretical chemist at the University of Southern California.
"The experiments by our collaborators (at the University of California, San Diego) demonstrated that this mechanism is present, and our theory explained why and how it happens," she said.
The breakthrough matters for two reasons. Concerted reactions have long been thought to play an important role in organic chemistry, and Krylov's theoretical model offers a framework for better understanding and perhaps manipulating such reactions.
In addition, important phenomena in the atmosphere and in combustion involve three-body reactions. Ozone forms when three molecules come together at exactly the same time – an event no different in theory from a simultaneous split.
Such events are relatively rare: Theory and experiment agree that in most cases a threesome will fall apart in steps, with one bond breaking before the next.
"Why would it happen simultaneously?" Krylov asked rhetorically.
But she and graduate student Vadim Mozhayskiy showed that if the electrons of the sym-triazine molecule are energized in a particular way, the whole flies apart into three identical and equally energetic parts.
Unraveling the mechanism has become possible only through the combined efforts of theoreticians and experimentalists.
Co-author Robert Continetti and his team at UCSD used electrical charges to energize molecules of sym-triazine to their breaking point. By separating the molecules in time and space, the researchers were able to identify the products from individual molecular events.
In some cases, the three parts from a single molecule had exactly the same energy and reached detectors at the same time, indicating that a simultaneous three-way split had occurred.
Even with this discovery, three-body reactions remain largely mysterious, Krylov said.
"The gap in understanding of single-bond and multiple-bond breaking processes is just incredible."
Krylov hopes to promote further work in the field through her iOpenShell Center, a USC-based institute supported by the National Science Foundation and created to foster collaborations between theoretical and experimental chemists.
"The center provides a framework for these interactions," she said.
Carl Marziali | EurekAlert!
Smart Data Transformation – Surfing the Big Wave
02.12.2016 | Fraunhofer-Institut für Angewandte Informationstechnik FIT
Climate change could outpace EPA Lake Champlain protections
18.11.2016 | University of Vermont
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
09.12.2016 | Life Sciences
09.12.2016 | Ecology, The Environment and Conservation
09.12.2016 | Health and Medicine