Chemists from RUDN University and INEOS RAS had a unique catalysts on the basis of two different metals

Chemists from RUDN University and INEOS RAS had a unique catalysts on the basis of two different metals

A team of chemists from RUDN University and INEOS synthesized two heterometallic clusters at once with an efficiency close to 100%. These compounds are used as catalysts in pharmaceuticals, polymer production and other areas of the chemical industry.

A metal cluster is an association of several metal atoms, between which there is a significant interaction. Clusters that consist of atoms of different metals are called heterometallic — they can be catalysts in organic reactions, for example in pharmaceuticals and polymer production. However, creating such clusters is not easy. The chemists of RUDN and INEOS described how it is possible to efficiently produce heterometallic clusters from an “ordinary” metal cluster consisting of three rhodium atoms.

“Rhodium is well known as a catalytic metal. There are many organic processes that are catalyzed by rhodium-based metal clusters. However, most approaches for the synthesis of heterometallic clusters are random and give a low yield of the desired product. We managed to create heterometallic clusters of rhodium with high reaction efficiency,” says Olga Chusova, PhD, researcher at the research center “Crystal Chemistry and Structural Analysis” of the RUDN University.

The chemists used a cluster of three rhodium atoms that join together to form a triangle. Ligands — molecules that dictate the behavior of rhodium atoms — are attached to the vertices and sides of this triangle. The detailed selection of ligands in both the initial cluster and the reagents allowed chemists to create new heterometallic clusters. The fact is that compounds feel better with some ligands than with others. In this case, the addition of metalloelectrophil as a reagent, which contains an atom of another metal with a lack of electrons, made it possible to create a new complex that consists of atoms of different metals — a heterometallic cluster. Instead of a triangle, a tetrahedron is formed — at its vertices three rhodium atoms and another gold or cobalt atom.

Such a mechanism provided almost one hundred percent efficiency of the reaction — that is, the actual amount of the obtained heterometallic cluster almost coincided with the theoretically calculated one (81% of the theoretical value for the cluster with cobalt and 93% — with gold). It is noteworthy that it worked equally well, despite the fact that metalelectrophiles with gold and with cobalt have different structures.

“Although metalloelectrophiles have different electronic structures, they both react with a triangular rhodium cluster and form stable tetrahedral clusters. This phenomenon is due to the unique structure of the original rhodium cluster, as it can provide a different number of electrons depending on the needs of the metalelectrophile. In this case, the gold derivative needed only two electrons to achieve the dream, and the cobalt derivative needed as many as six,” says Olga Chusova.

According to scientists, the discovery will increase the efficiency of the synthesis of catalysts based on heterometallic clusters for the chemical industry.

The study is published in the Journal of Organometallic Chemistry.

Visiting Professors View all
03 Nov 2017
Michele Pagano is a graduate of the University of Pisa, a leading scientist, the author of more than 200 publications in international journals, and a participant in many international research projects
Main Publications View all
15 Nov 2017
RUDN University scientists publish results of their scientific researches in highly-recognized in whole world and indexed in international databases journals (Web of Science, Scopus ect.). That, of course, corresponds to the high status of the University and its international recognition. Publications of June-September 2017 ( In Journals of categories Q1-Q3)
Similar newsletter View all
31 Mar
RUDN University awards for specific areas of science and technology based on the results of 2021

Every year, RUDN University selects the best of the best in the field of science and innovation and encourages with a special reward. Since 2009, the Academic Council of the University has been awarding one reward in natural and technical sciences and the other one in social and humanitarian sciences. Both individual researchers and groups of authors can become laureates.

31 Mar
International Day of Women and Girls in Science: women scientists of the RUDN talk about their path to science

“Science is the basis of all progress that facilitates the life of mankind and reduces its suffering,” — Marie Sklodowska—Curie. A symbol of a woman’s success in science. The first scientist in the world — twice winner of the Nobel Prize.

31 Mar
RUDN University Mathematicians Create a Model for Queue Organizing with Self-Sustained Servers

RUDN University mathematicians proposed a model for optimizing the operation of queuing systems (from computer networks to stores). Unlike analogues, the servers in it are self-sustained. They can determine when to start and stop working themselves. Such a model can be useful, for example, for online taxi services and other systems where workers choose their own operating hours.

Similar newsletter View all