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 New photocatalyst speeds up the conversion of carbon dioxide into chemical resources
29.05.2017 | DGIST (Daegu Gyeongbuk Institute of Science and Technology)

nachricht Copper hydroxide nanoparticles provide protection against toxic oxygen radicals in cigarette smoke
29.05.2017 | Johannes Gutenberg-Universität Mainz

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Strathclyde-led research develops world's highest gain high-power laser amplifier

The world's highest gain high power laser amplifier - by many orders of magnitude - has been developed in research led at the University of Strathclyde.

The researchers demonstrated the feasibility of using plasma to amplify short laser pulses of picojoule-level energy up to 100 millijoules, which is a 'gain'...

Im Focus: Can the immune system be boosted against Staphylococcus aureus by delivery of messenger RNA?

Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.

Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

New insights into the ancestors of all complex life

29.05.2017 | Earth Sciences

New photocatalyst speeds up the conversion of carbon dioxide into chemical resources

29.05.2017 | Life Sciences

NASA's SDO sees partial eclipse in space

29.05.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>