Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Jacobs researchers develop new carbene complexes for versatile industrial application

20.03.2013
Carbenes are considered rather unstable carbon compounds, whose synthesis in the form of carbene complexes showed only first results in the 1970s.

N-Heterocyclic carbenes (NHC) in particular were soon used in pharmaceutical and technical processes. Scientists at Jacobs University have now developed new ways of synthesizing stable NHC-complexes of main-group elements, which are user-friendly. They can be used as chemical overcharge protection in lithium ion batteries or possibly as liquid crystals in LC-displays.


New compounds with liquid-crystalline characteristics
Photo: Jacobs University

The German Research Foundation, the Federal Ministry of Economics and Technology and the Merck KGaA support the research with a total of €1.2million.

Starting from the precursor DFI (1,3-dimethyl-2,2-difluoroimidazolidine) Gerd-Volker Röschenthaler, Professor of Chemistry at Jacobs University and Dr. Tobias Böttcher for the first time produced a carbene complex of phosphor(V) through oxidative addition to PF3 and later from easier-to handle PCl3.

“Our aim was to find synthetic possibilities, which are easy to apply and which could simplify processes in research and development,” says Prof. Röschenthaler.

The new carbene complex NHC-PF5 allows for a variety of practical applications. In cooperation with Prof. Martin Winter from the MEET Institute at the University of Münster the Jacobs researchers learned that NHC-PF5 could be effective as chemical overcharge protection in lithium ion batteries: By adding the complex to its electrolyte components, the battery deactivated at 4.6 volt. An overcharge causing the battery to burst, ignite or explode can be prevented. The scientists are now looking into the reasons why NHC-PF5 serves well as an overcharge protection. Their collaborative research is supported by the Federal Ministry of Economics and Technology as well as industrial partners - among them BASF, Volkswagen AG, SGL Carbon, Toda Europe and Merck. Together with the University of Münster a patent has been filed for “Electrolyte additive for lithium-based energy sources” (University of Münster, Jacobs University Bremen), DE 10 2011 055 028.3, PCT/EP2012/071544).

In cooperation with Dr. Matthias Bremer from Merck, Prof. Röschenthaler, Dr. Böttcher and their team (Dr. Romana Pajkert and Dr. Maksym Ponomarenko) were also able to develop new compounds with liquid-crystalline characteristics. The compounds (see image of molecular structure) contain exceptionally large dipole moments, a prerequisite for application as liquid crystals. This particular class of compounds could constitute a new form of liquid crystals. The dipole moment serves to improve their properties, which in turn could lead to increased brilliance in smartphone displays or faster circuit times in monitors and flat-screens.

Together with Prof. Berthold Hoge from University of Bielefeld the Jacobs researchers could show that phosphor(V) carbene complexes could be split neatly by hydrogen fluoride to chemical salts with a very low melting point (they are liquid at room temperature). They can be used widely spread as so-called ionic liquids. Being easily produced in just one step the new synthetic route is of great interest to chemical industry as reaction medium in organic syntheses.

Another way to synthesize carbene complexes Röschenthaler and Böttcher found in carbene transfer: an inexpensive, simple and highly versatile method. First a carbene complex is synthesized that is both stable and at the same time labile enough to transfer the carbene to the favored element. The scientists used NHC-SiCl4 as transfer reagent and transferred the carbene to PCl3 (Chemical Science, 2013, 4, 77-83, DOI: 10.1039/C2SC21214E). This is the first time a carbene has been transferred from one main group element to another. Furthermore, it is also possible to transfer carbenes to transition metals, which the scientists could show with nickel(II) and palladium(II)chloride. Carbene complexes of these metals often show good catalytic properties and thus are relevant for industry. A patent has been filed for this new manufacturing method as well: „Silicon-based Carbene Transfer Reagent“ (Jacobs University Bremen, DE 10 2012 102 535.5).

Contact:
Gerd-Volker Röschenthaler | Professor of Chemistry
E-mail: g.roeschenthaler@jacobs-university.de | Phone: +49 421 200-3138

Dr. Kristin Beck | idw
Further information:
http://www.jacobs-university.de

More articles from Life Sciences:

nachricht Could this protein protect people against coronary artery disease?
17.11.2017 | University of North Carolina Health Care

nachricht Microbial resident enables beetles to feed on a leafy diet
17.11.2017 | Max-Planck-Institut für chemische Ökologie

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

NASA detects solar flare pulses at Sun and Earth

17.11.2017 | Physics and Astronomy

NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures

17.11.2017 | Health and Medicine

The importance of biodiversity in forests could increase due to climate change

17.11.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>