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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
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Vanadium Compounds as Biocatalyst Models
Juliana E Parente1, Patricia A M Williams1, Evelina G Ferrer2
1Center of Inorganic Chemistry (CEQUINOR, CONICET-CICPBA-UNLP)-Department of Chemistry-Faculty of Exact Sciences, National University of La Plata, Boulevard 120 e/60 y 64, 1900, B1900AVV, La Plata, Argentina.
Biological Trace Element Research
|August 25, 2019
Summary
Vanadium complexes mimic peroxidase activity, catalyzing phenol red bromination with high efficiency. Oxidovanadium(IV) also oxidizes pyrogallol following Michaelis-Menten kinetics, while peroxidovanadium(V) shows a complex mechanism.
Area of Science:
- Inorganic Chemistry
- Biomimetic Chemistry
- Catalysis
Background:
- Peroxidase enzymes are crucial in biological systems.
- Vanadium compounds offer potential as biomimetic catalysts.
- Understanding vanadium-based peroxidase mimetics is key for catalytic applications.
Purpose of the Study:
- To evaluate peroxidovanadium(V) and oxidovanadium(IV) complexes as peroxidase-similar catalysts.
- To investigate their catalytic activity on phenol red and pyrogallol substrates.
- To determine the kinetic behavior and structure-activity relationships of these vanadium complexes.
Main Methods:
- Synthesis and characterization of peroxidovanadium(V) and oxidovanadium(IV) complexes.
- Kinetic studies using phenol red and pyrogallol as substrates.
- Bromination kinetic analysis to determine Michaelis-Menten parameters.
- Oxidation studies of pyrogallol with vanadium complexes.
Main Results:
- Both vanadium complexes exhibited peroxidase-like activity.
- Michaelis-Menten kinetics were observed for phenol red bromination by both complexes, with catalytic efficiency around 10^4 M^-1 min^-1.
- Oxidovanadium(IV) followed Michaelis-Menten kinetics for pyrogallol oxidation (Km = 1.05 × 10^-3 M).
- Peroxidovanadium(V) showed a more complex mechanism for pyrogallol oxidation, requiring further investigation.
Conclusions:
- Vanadium complexes can effectively mimic peroxidase activity.
- The catalytic mechanisms differ between peroxidovanadium(V) and oxidovanadium(IV) complexes, especially with pyrogallol.
- Further research is needed to fully elucidate the catalytic mechanism of peroxidovanadium(V).
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