The first examples of metallasilsesquioxane complexes, including ligands of the 8-hydroxyquinoline family 1–9, were synthesized, and their structures were established by single crystal X-ray diffraction using synchrotron radiation. Compounds 1–9 tend to form a type of sandwich-like cage of Cu4M2 nuclearity (M = Li, Na, K). Each complex includes two cisoid pentameric silsesquioxane ligands and two 8-hydroxyquinoline ligands. The latter coordinates the copper ions and corresponding alkaline metal ions (via the deprotonated oxygen site). A characteristic (size) of the alkaline metal ion and a variation of characteristics of nitrogen ligands (8-hydroxyquinoline vs. 5-chloro-8-hydroxyquinoline vs. 5,7-dibromo-8-hydroxyquinoline vs. 5,7-diiodo-8-hydroxyquinoline) are highly influential for the formation of the supramolecular structure of the complexes 3a, 5, and 7–9. The Cu6Na2-based compound 2 exhibits high catalytic activity towards the oxidation of (i) hydrocarbons by H2O2 activated with HNO3, and (ii) alcohols by tert-butyl hydroperoxide. Studies of kinetics and their selectivity has led us to conclude that it is the hydroxyl radicals that play a crucial role in this process.
Download Molecule Royalty-Free Photos, Illustrations, and Vectors
Molecule animated word cloud, text desig, Stock Video
Molecules, Free Full-Text, kelly godoy coelho
Molecules, Free Full-Text
Free Molecule 3D Models for Download
cdn./30/96830-050-21DD5A90/heads-lip
Molecules, Free Full-Text, Stearic Acid
Biomolecules, Free Full-Text
A to Z Index
Molecules, Free Full-Text, mate pastor con negras
The citric acid cycle, Cellular respiration (article)
Molecules, Free Full-Text, chinese wall cpa 20
