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Anticancer Metal Complexes: Synthesis and Cytotoxicity Evaluation by the MTT Assay

Anticancer Metal Complexes: Synthesis and Cytotoxicity Evaluation by the MTT Assay

Published on: November 10, 2013

Oxovanadium(IV) silsesquioxane complexes.

Christian Ohde¹, Christian Limberg, Reinhard Stösser

¹Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany.

Inorganic Chemistry

|February 2, 2010

Summary

This summary is machine-generated.

This study synthesizes novel oxovanadium complexes using silsesquioxane ligands, revealing complex reaction pathways and potential models for catalytic processes on vanadia surfaces.

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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

Area of Science:

Organometallic Chemistry
Catalysis
Materials Science

Background:

Silica-supported vanadia catalysts are crucial for various industrial processes.
Understanding the behavior of oxovanadium species on catalyst surfaces is essential for optimizing performance.
Reduced oxovanadium species play a key role in catalytic cycles.

Purpose of the Study:

To model reduced oxovanadium species on silica-supported vanadia catalysts.
To synthesize and characterize novel vanadium-silsesquioxane complexes.
To investigate the reactivity and structural properties of these complexes.

Main Methods:

Reaction of H(3)(c-pentyl)T(7) with Cl(4)V(THF)(2) in the presence of triethylamine.
Electron paramagnetic resonance (EPR) spectroscopy.
Single-crystal X-ray diffraction.
SQUID magnetometry.
Spectroscopic investigations (e.g., UV-Vis).

Main Results:

Formation of a complex mixture including V(IV) and V(V) species.
Isolation and structural determination of a chloride-free V(IV) complex, [((c-pentyl)T(7))(2)(V(IV)=O)(3)(THF)(2)] (2).
Identification of water and the silsesquioxane ligand as sources of oxo ligands.
Evidence of ferromagnetic coupling between vanadyl units in complex 2.
Oxidation of complex 2 to a V(V) complex upon exposure to dioxygen.

Conclusions:

The reaction pathways for forming oxovanadium species are complex and involve ligand-assisted oxo transfer.
The synthesized V(IV) complex serves as a potential model for intermediates in catalytic oxidation reactions.
The observed ferromagnetic coupling provides insights into the electronic structure of vanadyl units.
The rapid reoxidation of the V(IV) complex models surface reoxidation processes in vanadia catalysis.