Nav: Home

Oregon chemists build a new, stable open-shell molecule

June 09, 2016

EUGENE, Ore. - June 9, 2016 -- University of Oregon chemists have synthesized a stable and long-lasting carbon-based molecule that, they say, potentially could be applicable in solar cells and electronic devices.

The molecule changes its bonding patterns to a magnetic biradical state when heated; it then returns to a fully bonded non-magnetic closed state at room temperature. That transition, they report, can be done repeatedly without decomposition. It remains stable in the presence of both heat and oxygen.

Biradical refers to organic compounds, known as open-shell molecules, that have two free-flowing, non-bonding electrons. Producing them using techniques to control their electron spin, and thus provide semiconducting properties, in a heated state has been hampered by instability since the first synthetic biradical hydrocarbon was made in 1907.

"Potentially our approach could help to make organic solar cells more efficient than silicon solar cells, but that's probably far in the future," said UO doctoral student Gabriel E. Rudebusch, the paper's lead author. "Our synthesis is rapid and efficient. We easily can make a gram of this compound, which is very stable when exposed to oxygen and heat. This stability has been almost unheard of in the literature about biradical compounds."

The four-step synthesis of the compound -- diindenoanthracene, or DIAn -- and how it held up when tested in superconducting materials were detailed in a proof-of-principle paper published online May 23 by the journal Nature Chemistry. The UO team collaborated with experts in Japan, Spain and Sweden.

The molecular framework for the new molecule involves the hydrocarbon anthracene, which has three linearly fused hexagonal benzene rings, in combination with two five-membered pentagonal rings.

"The big difference between our new molecule and a lot of other biradical molecules that have been produced is those five-membered rings," said co-author Michael M. Haley, who holds the UO's Richard M. and Patricia H. Noyes Professorship in Chemistry. "They have the inherent ability to accept electrons or give up electrons. This means DIAn can move both negative and positive charges, which is an essential property for useful devices such as transistors and solar cells. Also, we can heat up our molecule to 150 degrees Celsius, bring it back to room temperature and heat it up again, repeatedly, and we see no decomposition in its reaction to oxygen. The unique features of DIAn are essential if these molecules are to have a use in the real world."

Haley's lab is now seeking to develop derivatives of the new molecule to help move the technology forward into potential applications.
-end-
Co-authors with Rudebusch and Haley were: Jonathan L. Marshall, a former doctoral researcher in Haley's lab; Lev N. Zakharov of the UO's Center for Advanced Materials Characterization in Oregon; Kjell Jorner and Henrik Ottosson of Sweden's Uppsala University; Kotaro Fukuda and Masayoshi Nakano of Osaka University in Japan; Carlos J. Gómez-García of the University of Valencia in Spain; and José L. Zafra, Iratxe Arrechea-Marcos, Guzmán L. Espejo, Rocío Ponce Ortiz, and Juan Casado, all of the University of Malaga in Spain.

The National Science Foundation supported the research at the UO (grant CHE-1301485 to Haley). Additional funding support came from organizations within the governments of Spain, Japan and Sweden.

Source: Michael Haley, professor of chemistry, UO Department of Chemistry and Biochemistry, 541-346-0456, haley@uoregon.edu, and Gabe Rudebusch, UO doctoral student, ger@uoregon.edu

Note: The UO is equipped with an on-campus television studio with a point-of-origin Vyvx connection, which provides broadcast-quality video to networks worldwide via fiber optic network. There also is video access to satellite uplink and audio access to an ISDN codec for broadcast-quality radio interviews.

Links:

Paper abstract: http://www.nature.com/nchem/journal/vaop/ncurrent/full/nchem.2518.html

Haley faculty page: http://chemistry.uoregon.edu/profile/haley/

Haley lab: http://haleylab.uoregon.edu/index.html

UO Department of Chemistry and Biochemistry: http://chemistry.uoregon.edu/

University of Oregon

Related Solar Cells Articles:

Solar cells more efficient thanks to new material standing on edge
Researchers from Lund University in Sweden and from Fudan University in China have successfully designed a new structural organization using the promising solar cell material perovskite.
Printable solar cells just got a little closer
A University of Toronto Engineering innovation could make printing solar cells as easy and inexpensive as printing a newspaper.
A big nano boost for solar cells
Solar cells convert light into electricity. While the sun is one source of light, the burning of natural resources like oil and natural gas can also be harnessed.
Game changer for organic solar cells
Researchers develop a simple processing technique that could cut the cost of organic photovoltaics and wearable electronics.
Physics, photosynthesis and solar cells
A University of California, Riverside assistant professor has combined photosynthesis and physics to make a key discovery that could help make solar cells more efficient.
Throwing new light on printed organic solar cells
Researchers at the University of Surrey have achieved record power conversion efficiencies for large area organic solar cells.
A new way to image solar cells in 3-D
Berkeley Lab scientists have developed a way to use optical microscopy to map thin-film solar cells in 3-D as they absorb photons.
Toward 'greener,' inexpensive solar cells
Solar panels are proliferating across the globe to help reduce the world's dependency on fossil fuels.
A new technique opens up advanced solar cells
Using a novel spectroscopic technique, EPFL scientists have made a much-needed breakthrough in cutting-edge photovoltaics.
OU physicists developing new systems for next generation solar cells
University of Oklahoma physicists are developing novel technologies with the potential to impact utility-scale energy generation, increase global energy capacity and reduce dependence on fossil fuels by producing a new generation of high efficiency solar cells.

Related Solar Cells Reading:

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Bias And Perception
How does bias distort our thinking, our listening, our beliefs... and even our search results? How can we fight it? This hour, TED speakers explore ideas about the unconscious biases that shape us. Guests include writer and broadcaster Yassmin Abdel-Magied, climatologist J. Marshall Shepherd, journalist Andreas Ekström, and experimental psychologist Tony Salvador.
Now Playing: Science for the People

#513 Dinosaur Tails
This week: dinosaurs! We're discussing dinosaur tails, bipedalism, paleontology public outreach, dinosaur MOOCs, and other neat dinosaur related things with Dr. Scott Persons from the University of Alberta, who is also the author of the book "Dinosaurs of the Alberta Badlands".