For the first time, Würzburg scientists have successfully bound multiple carbon monoxide molecules to the main group element boron. They report on their work in the latest issue of the scientific journal Nature.
Scientists of Professor Holger Braunschweig's team of the Institute of Inorganic Chemistry at the University of Würzburg have successfully bound two carbon monoxide molecules (CO) to the main group element boron in a direct synthesis for the first time. The result is a borylene-dicarbonyl complex.
Such complexes, or coordination complexes, are generally made up of one or more central molecules and one or more ligands. The central molecules are usually atoms of transition metals.
"Binding one CO molecule to a main group element is already extraordinary. Bonding two molecules two one non-metal atom is even more extraordinary," says chemist Rian Dewhurst. Dewhurst, who is working on Professor Holger Braunschweig's team, submitted the article together with several co-authors. It is the first work of the institute to have been accepted by the journal Nature.
"In future, borylene-dicarbonyls could be used to mimic the properties of transition metal carbonyl complexes," Dewhurst further. Transition metals have specific electronic properties. These elements from group four to twelve in the periodic table have the ability to bind multiple carbon monoxide molecules relatively easily.
Advantages of boron compounds
Generally, boron compounds are important for various industrial applications. They are used, for example, in catalytic processes, in various molecular and solid materials or in the production of pharmaceutical drugs. A catalyst accelerates a desired chemical reaction without being consumed in the process.
Boron has the advantage of being readily available and comparably low-priced. It occurs naturally mostly in mineral form and is mined in borate mines in California and Turkey, for example. Moreover, the element is non-toxic for humans and other mammals. "Combined with its unique electronic properties, this makes boron very interesting for industrial and other commercial uses," Dewhurst explains.
Boron is a highly reactive element. With three electrons on the outer shells, boron strives to form bonds that enable eight electrons, which the noble gases neon, argon or xenon already have in their basic state.
Lone electron pair at the central molecule
The borylene-dicarbonyl complex also has eight electrons involved in the bonds to the boron atom. With two electrons, respectively, presenting the bonds to the two CO molecules and two others binding one hydrocarbyl, the researchers were able to establish one lone electron pair amounting to eight electrons in total. "It is the lone electron pair that makes the complex special. The hydrocarbyl assures stability. It shields the structure in a manner of speaking," says Marco Nutz, a doctoral candidate. He adds: "Most compounds that can be isolated in this way are unstable outside a protective atmosphere." The Würzburg discovery, however, remains stable for several days even in a "normal" environment exposed to air and moisture.
Dewhurst and Nutz are conducting basic research. "In a next step, we are going to further investigate the compound we have presented. We are pursuing different angles here," Dewhurst says. One focus will be to compare the properties of conventional transition metal carbonyl complexes with those of the borylene-carbonyl complex in detail.
In recent years, the attention of natural science has progressively focused on boron. According to Dewhurst, the increasing significance of boron is also reflected in the growing interest in the element on the part of organic chemistry and in the fact that material science, too, is closely following the advances made in boron complex research.
"Multiple Complexation of CO and Related Ligands to a Main Group Element" by Holger Braunschweig, Rian D. Dewhurst, Florian Hupp, Marco Nutz, Krzysztof Radacki, Christopher W. Tate, Alfredo Vargas, Qing Ye. Nature vol 522, issue 7556 pp.327-330, DOI 10.1038/nature14489
Prof. Holger Braunschweig, Institute of Inorganic Chemistry at the University of Würzburg
Phone: +49 931 31-88104, e-mail: firstname.lastname@example.org
http://www.presse.uni-wuerzburg.de University's press office
Marco Bosch | Julius-Maximilians-Universität Würzburg
Further reports about: > CO molecules > Julius-Maximilians-Universität > basic research > bonds > carbon monoxide > carbon monoxide molecules > catalytic processes > chemical reaction > electronic properties > industrial applications > material science > natural science > noble gases > organic chemistry > pharmaceutical drugs > solid materials > transition metal
Water forms 'spine of hydration' around DNA, group finds
26.05.2017 | Cornell University
How herpesviruses win the footrace against the immune system
26.05.2017 | Helmholtz-Zentrum für Infektionsforschung
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....
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....
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...
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...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy