Chemists synthesize a new hybrid organic-inorganic catalyst

March 4, 2019, RUDN University
Credit: Natalia Deryugina

RUDN chemists have synthesized metal complexes on the basis of the organoelemental substance silsesquioxane that consists of an organic and an inorganic part. Such hybrid systems may be used as efficient catalysts, for example, to obtain alcohols from alkanes. The work was published in the Inorganic Chemistry journal.

Physical and chemical parameters of any material or substance are limited and cannot be infinitely improved. So scientists work on hybrid materials that combine different components and therefore demonstrate new properties. In modern chemistry, special attention is paid to compounds that consist of metal centers and organic "bridges" that keep them together. Such objects have a number of valuable properties and may be used for industrial purposes: catalysis, storage of gases, accurate separation of mixed . They can also be used to create chemical sensors and agents to deliver drugs to their targets in the body.

Hybrid organoelemental substances such as silsesquioxanes consist of an inorganic main chain Si-O-Si and an organic framework of Si atoms. Compounds like this can be formed when metal atoms are added to carcass structures with promising catalytic and magnetic properties. RUDN chemists suggested a new approach to such compounds based on the use of additional complex-forming substances (ligands).

The new products were obtained in the course of a silsesquioxane and copper dichloride self-assembly reaction in the presence of organic ligands—phenanthroline and neocuproine. In the first case the scientists observed the case of "hidden control" as phenanthroline facilitated the formation of a previously unknown carcass compound but was not included into the product. The use of the second led to an unusual result: the product consisted of several components with copper atoms distributed among ligands of different nature—an oxygen-consisting one (silsesquioxane) and a nitrogen-consisting one (neocuproine). The first obtained substance was used in oxidizing reactions of organic synthesis—amidation and functionalization of alkanes and alcohols.

"We managed to obtain unusual objects with high concentration of metal centers (in this case—copper atoms) incorporated into a silicon-organic matrix. To carry out such reactions we used various organic ligands changing the standard mechanisms of carcass formation. We studied the obtained substances as catalysts of chemical reactions, and their catalyst activity in the amidation reaction turned out to remain quite high even at very low concentrations (100 ppm in copper)," said Alexey Bilyachenko, a co-author of the work and Deputy Director of the United Institute of Chemical Research, RUDN.

Explore further: Chemist develops a new catalyst for oxidation and amidation

More information: Grigorii S. Astakhov et al. High-Cluster (Cu9) Cage Silsesquioxanes: Synthesis, Structure, and Catalytic Activity, Inorganic Chemistry (2018). DOI: 10.1021/acs.inorgchem.8b01496

Related Stories

Chemist develops a new catalyst for oxidation and amidation

February 18, 2019

A RUDN chemist has obtained a compound with a new structural type containing atoms of metals (copper and sodium) in a carcass structure and that is shaped like a bicycle helmet. The compound shows catalytic activity in two ...

Researchers develop a cheap, targeted antibacterial compound

February 13, 2019

An international scientific group including a RUDN chemist have developed a complex copper-based compound with stronger antibacterial properties compared to analogs, and is cheaper to produce. The scientists confirmed that ...

Recommended for you

Coffee-based colloids for direct solar absorption

March 22, 2019

Solar energy is one of the most promising resources to help reduce fossil fuel consumption and mitigate greenhouse gas emissions to power a sustainable future. Devices presently in use to convert solar energy into thermal ...

EPA adviser is promoting harmful ideas, scientists say

March 22, 2019

The Trump administration's reliance on industry-funded environmental specialists is again coming under fire, this time by researchers who say that Louis Anthony "Tony" Cox Jr., who leads a key Environmental Protection Agency ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.