Synthesis and study of new inorganic substances and materials / Laboratory of Chemistry of Exchange Clusters
- Rating:
-
- (0 / 5)
Description
Main areas of workDirected synthesis and stereochemistry of heterometallic clusters based on the Hoffmann concept of isolobal analogies.
Synthesis of metal complexes with unusual carbenoids — organotellurgal halides, stanlenylenes, N-heterocyclic carbenes, organohalides (arene-ruthenium, cyclopentadienyl-cobalt and -rodium, cyclobutadiene-cobalt, tris-pyrazolylborate and c-pyrazolilo-rhenium and c-pyrazolilo-rhenium and c-pyrazolilo-rhenium - tin and metal tellurium.
Synthesis and magnetochemistry of heterometallic chalcogen-containing chromium complexes simulating spin-spin interactions in magnetic semiconductors and reactions in nitrogen-fixing enzymes of the MoFeS-type nitrogenase cofactor.
The most significant results
The principle of step construction of heterometallic complexes has been developed:
1) synthesis of a homometallic complex having functional groups (chalcogenate, halide, carboxylate, beta-diketonate, pyrazolate);
2) at their expense, this complex is attached as a ligand to the atom of another transition metal in its electron-deficient complex, forming a heterometallic complex, bi- or polynuclear, depending on the ratio of reactants and coordination capabilities of the central metal atom. The predictive possibilities of such heterometalization sharply increase if the introduced organometallic fragments are isolobal, ie differ in the nature of metals and ligands with them, but have a similar configuration and energy of boundary orbitals (for example, ferrocenyl and cymantrenyl; trimethylplatin and tricarbonylrhenium; arerhenium and cyclopentadienylrodium).
Special attention was paid to the synthesis, structure and thermal decomposition of chalcogen and tin-containing heterometallic clusters, which in all cases have sharply (by 0.3 A) shortened partially multiple M-E bonds, probably due to the strong dative interactions of the transition metal - non-transition element. Due to the strength of such bonds during pyrolysis, the composition of the metal-stock is preserved, which contributes to the preparation of inorganic compositions containing usually difficult to combine elements (for example, tin and tungsten).
Based on the synthesis of platinum-containing heterometallic clusters and their thermal decomposition, highly efficient nanoscale catalysts for the reduction of molecular oxygen in methanol-air fuel cells and the processing of rapeseed oil into hydrocarbons were obtained.
Comments and reviews (0)
No comments yet
Add comment
See also:
