Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

One dozen at a blow: main principle for alloys is discovered

12.11.2008
Molecular metallurgists galvanize and gild atoms - RUB scientists hit the title story of "Angewandte Chemie"

They turned out to be steelworkers, running their steel mill in the nanoworld - the chemists around Prof. Dr. Roland A. Fischer (faculty of chemistry of RUB). In the neverland between molecule and metal they discovered a new family of compounds.

The prototype of these new “nano alloys” is a compound containing one central molybdenum atom binding twelve zinc atoms. The icosahedral metal chunk is wrapped into hydrocarbons and therefore surprisingly stable. Its construction is transferable to both other metal centers and other structures. Also the zinc atoms can be exchanged to other metal atoms, even to gold. The scientists report about this simultaneously in the title story of “Angewandte Chemie” and in “Chemistry & Engineering News” of the American Chemical Society.

Galvanized and gilded metal atoms

Gregorius Agricolas famous opus of the year 1556 about mining and metallurgy contained the knowledge of metallurgy at his time. De re metallica would also be a good title for a present chemistry textbook, keeping in mind that four fifth of all elements in the periodic table are metals. Zinc is an exceptional metal for alloys, e.g. brass is just a mixture of copper and zinc. On the atomic level the “alloying” is related to the formation of metal clusters, small chunks made of several metal atoms.

A central metal atom binds other metal atoms leading to a structure which contains exactly the number of corners as atoms bound to the central atom. According to the binding properties of the metal atoms higher structures are formed. “Of particular beauty is the icosahedron, a structure made of twenty equilateral triangles”, says Prof. Fischer. “It represents the highest symmetric platonic body.” The newly discovered molecule exhibits exactly this structure, in which a molybdenum atom holds a dozen of zinc atoms. The scientists discovered that other metal atoms like iron, nickel and platinum can be similarly galvanized in a molecular way, they can be even gilded.

Molecular metallography

The discovered icosahedron (Mo(ZnR)12) is related rather closely to tetrahedral methane (CH4): The ZnR units bound to the central molybdenum behave analogously to the hydrogen atoms in methane. The quantum theoretical analysis of Prof. Dr. Gernot Frenking (Marburg) confirms that the radial bonds between molybdenum and zinc are strong whereas the peripheric zinc atoms bind barely to each other. Therefore zinc can be exchanged by other metals, even by gold.

This matches with the property of metals to form alloys. For a modeling of this phenomenon on a molecular level new synthetic methods are discovered now. The new molecules help to understand the chemical binding properties between metal atoms and are also interesting as precursors for catalysts (SFB 558, project B10; http://www.sfb558.de/).

Prof. Dr. Roland A. Fischer | alfa
Further information:
http://www.sfb558.de
http://www3.interscience.wiley.com/cgi-bin/fulltext/121501704/HTMLSTART
http://www.ruhr-uni-bochum.de

More articles from Life Sciences:

nachricht Cryo-electron microscopy achieves unprecedented resolution using new computational methods
24.03.2017 | DOE/Lawrence Berkeley National Laboratory

nachricht How cheetahs stay fit and healthy
24.03.2017 | Forschungsverbund Berlin e.V.

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Argon is not the 'dope' for metallic hydrogen

24.03.2017 | Materials Sciences

Astronomers find unexpected, dust-obscured star formation in distant galaxy

24.03.2017 | Physics and Astronomy

Gravitational wave kicks monster black hole out of galactic core

24.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>