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Boroles get a stability boost

Boroles could be a highly interesting class of materials for practical use in photovoltaic or LED applications - if it weren't for the molecules' extreme instability. Chemists from Wuerzburg have now discovered a powerful stabiliser.


Image: Fluoromesityl groups boost the stability of boroles. F stands for fluorine, B for boron and C for carbon. [Credit, picture: Todd Marder]
A stable borole

Boroles are boron containing molecules that have great electron-accepting ability. This makes them excellently suited for materials that could bring further improvements to photovoltaics or OLEDs. But so far, boroles have had one major drawback: They are highly unstable and decay virtually immediately when in contact with water or oxygen.

Chemists at the University of Wurzburg have now made an important step forward: Todd Marder and fellow chemists at the Institute of Inorganic Chemistry have significantly stabilised borole molecules by adding a so-called fluoromesityl group, which makes the highly sensitive boroles about 600 times more resistant to water. As a result, the molecules are stable for ten to twelve hours compared to just one minute without the stabilising group. Their electron-accepting ability is fully preserved.

Now the new molecules' robustness will be verified in further tests. The fluoromesityl boroles have proved to be heat resistant and easily vapourable. Therefore, the Wurzburg chemists are now eager to investigate whether the novel boroles can be vapour deposited on substrates in wafer-thin films. This would be a major prerequisite for technological applications. Moreover, the scientists are looking for other molecule groups that might stabilise boroles even more efficiently.


Great collaborative spirit

Todd Marder's team with the work groups of Holger Braunschweig and Klaus Muller-Buschbaum has published the results in the magazine Chemical Science. Marder emphasises that the joint research of boroles is characterised by a great collaborative spirit which is generally true for the atmosphere at the Wurzburg department. The US chemist has researched and taught in Wurzburg since 2012. In the 15 years before, he had been head of department at Durham University in England.


An excellent global network

He also points out that the Wurzburg Department of Chemistry has an excellent global network: "Everyone here is committed to getting top-class international scientists to work in Wurzburg." The Humboldt Foundation supports this goal by awarding generous grants to postdocs. The two initial authors of the publication in Chemical Science, Zuolun Zhang from China and Robert M. Edkins from the UK, also arrived in Wurzburg with a Humboldt scholarship in their pockets.


Comment for Science magazine

Shubhankar Kumar Bose from India joined the University of Wurzburg as a Humboldt scholar and stayed there as a postdoc. Only recently did he and Todd Marder author a comment for Science magazine: As experts in boron chemistry and boron catalysis, the two scientists had been invited by the leading magazine to assess the work of a Canadian chemist [see below]. This is another example of the international renown of the Wurzburg Department of Chemistry.


Top result in Shanghai Ranking

Accordingly, the Department of Chemistry has achieved good ranking results in the renowned Shanghai Ranking (Academic Ranking of Universities Worldwide) of Jiao-Tong University for many years. In 2014, they ranked 30th among the more than 1,200 universities that were assessed which corresponds to rank two in the Germany-wide comparison. The Shanghai Ranking evaluates the research performance of universities according to various parameters.

Further Information:

Zuolun Zhang, Robert M. Edkins, Martin Haehnel, Marius Wehner, Antonius Eichhorn, Lisa Mailander, Michael Meier, Johannes Brand, Franziska Brede, Klaus Muller-Buschbaum, Holger Braunschweig, Todd B. Marder:
Taming the beast: fluoromesityl groups induce a dramatic stability enhancement in boroles.
In: Chemical Science; published online 13 Jul 2015, DOI 10.1039/C5SC02205C

Shubhankar Kumar Bose, Todd B. Marder:
A leap ahead for activating C-H bonds.
In: Science; published online 31 July 2015, DOI 10.1126/science.aac9244

Source: Julius-Maximilians-University, Würzburg, Germany


Last update: 12.08.2015

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