In synthetic chemistry, so-called element-element bonding can be systematically exploited to assemble small building blocks to obtain structures that are more complex than the “starting material” and can be used for the resource-saving production of more precious materials.
In the newly discovered coupling reaction, molecule A is transformed into four-atom boron chain B
Scientists at Heidelberg University’s Institute of Inorganic Chemistry have discovered a hitherto unknown coupling reaction. Two positively charged compounds of the element boron join to form a new molecule with a chain of four boron atoms. The team headed by Prof. Dr. Hans-Jörg Himmel now intends to investigate the further implications of this unexpected bond formation.
In carbon chemistry, element-element coupling reactions play a crucial role. For example, small building blocks with very few carbon atoms of the kind produced by the steam cracking of crude oil are assembled to generate a broad range of products, including plastics, fuels, lipids and detergents, as well as more complex substances like pharmaceutical agents.
Due to this great significance, a large number of synthesis variants have been developed. In their research work the Heidelberg scientists focus on coupling reactions of this kind with compounds involving the element boron which are similar in structure to the corresponding carbon compounds.
As Professor Himmel explains, the new element-element combinations normally result from a reaction between two electrically neutral or differently polarised atoms, not between two positively or two negatively polarised ones. But now the Heidelberg researchers have discovered a coupling reaction in which two positively charged molecules bond together. This is made possible by so-called multi-centre bonding, which plays a significant role in boron chemistry. “The product of this reaction is a compound with four boron atoms,” says Prof. Himmel. “This in its turn is a promising precursor on the route toward the making of complex boron chains.”
Such compounds of the element boron were unknown so far, says the Heidelberg chemist. He and his team are now investigating the further combination of the four-atom boron chain to form boron chain polymers expected to possess high electrical conductivity and other useful material properties. Such materials would be of interest for electronic and optoelectronic applications, Prof. Himmel concludes. The research results have now been published in “Nature Chemistry”.
Marietta Fuhrmann-Koch | idw
Enduring cold temperatures alters fat cell epigenetics
19.04.2018 | University of Tokyo
Full of hot air and proud of it
18.04.2018 | University of Pittsburgh
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.
Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...
In the fight against cancer, scientists are developing new drugs to hit tumor cells at so far unused weak points. Such a “sore spot” is the protein complex...
In an article that appears in the journal “Review of Modern Physics”, researchers at the Laboratory for Attosecond Physics (LAP) assess the current state of the field of ultrafast physics and consider its implications for future technologies.
Physicists can now control light in both time and space with hitherto unimagined precision. This is particularly true for the ability to generate ultrashort...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
19.04.2018 | Materials Sciences
19.04.2018 | Physics and Astronomy
19.04.2018 | Physics and Astronomy